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JOURNAL OF matERIALS sciENCE & TECHNOLOGY 2024年第000期175卷 47-54页

作者： Sun, Jinmei Liu, Tie Guo, Xiaoyu Yuan, Shuang Wang, Jun Hirota, Noriyuki Wang, Qiang Northeastern Univ Key Lab Electromagnet Proc Mat Minist Educ Shenyang 110819 Peoples R China Northeastern Univ Sch Mat Sci & Engn Shenyang 110819 Peoples R China Northeastern Univ Sch Met Shenyang 110819 Peoples R China Northwestern Polytech Univ State Key Lab Solidificat Proc Xian 710072 Peoples R China natl Inst mat sci Res Ctr Fundamental Mat Tsukuba 3050003 Japan

The obvious grain refinement of the primary MnSb phase has been observed in the Mn-89.7 wt% Sb alloy directionally solidified under a high-gradient magnetic field. With the application of a high-gradient magnetic field, the morphology of the primary MnSb phase transformed from developed dendritic-like to equiaxed-like, and the grain size decreased by approximately 93%. Refinement of the primary MnSb phase can be attributed to the constituent supercooling in front of the solidification interface, which promoted nucleation of the primary MnSb phase. The constituent supercooling can be linked to the enrichment of the Mn solute induced by the magnetic force and the Lorentz force that drove Mn solute migration and suppressed convection.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of materials science & Technology.

关键词： Grain refinement High-gradient magnetic field Magnetic force Lorentz force Directional solidification AL-SI ALLOY GROWTH MELT MICROSTRUCTURE SEGREGATION NUCLEATION DEPENDENCE DENDRITE ELEMENTS

An efficient scheme for accelerating the calculation of stacking fault energy in multi-principal element alloys

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JOURNAL OF matERIALS sciENCE & TECHNOLOGY 2024年第000期175卷 204-211页

作者： Sun, Haoran Ding, Zhigang Sun, Hao Zhou, Junjun Ren, Ji-Chang Hu, Qingmiao Liu, Wei Nanjing Univ sci & Technol Sch Mat Sci & Engn Nanjing 210094 Peoples R China Chinese Acad sci State Key Lab Rare Earth Resource Utilizat Changchun Inst Appl Chem Changchun 130022 Peoples R China Chinese Acad sci Inst Met Res Shenyang Natl Lab Mat Sci Shenyang 110016 Peoples R China

We present the High-Throughput Computing and Statistical Analysis (HCSA) scheme, which efficiently and accurately predicts the stacking fault energies (SFEs) of multi-principal element alloys (MPEAs). Our approach estimates the SFE of a single complex supercell by averaging numerous SFEs from small supercells, resulting in superior accuracy compared to traditional density functional theory (DFT) calculations. To validate our scheme, we applied it to NiFe and Ni 10 Co 60 Cr 25 W 5 alloys, achieving an SFE error of only 11%, in contrast to the 45% error obtained from traditional DFT calculations for NiFe. We observed a strong correlation between the average SFEs of samples with the same valence electron concentration as that of the experimental data. Our scheme provides an efficient and reliable tool for predicting SFEs in MPEAs and holds the potential to significantly accelerate materials design and discovery processes.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of materials science & Technology.

关键词： Multi-principal element alloys Stacking fault energy Density functional theory High-throughput calculation HIGH-ENTROPY ALLOY SHORT-RANGE ORDER MOLECULAR-DYNAMICS PHASE-TRANSFORmatION STRENGTH NI DISLOCATIONS DUCTILITY CRCONI MECHANISMS

Water vapor effects on the oxidation resistance of modified potassium silicate coating at high temperature

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JOURNAL OF matERIALS sciENCE & TECHNOLOGY 2024年第000期176卷 25-35页

作者： Du, Yao Chen, Zheng Lu, Yiliang Wang, Cheng Yang, Lanlan Zhu, Shenglong Wang, Fuhui Univ sci & Technol China Sch Mat Sci & Engn Shenyang 110016 Peoples R China Chinese Acad sci Shi Changxu Innovat Ctr Adv Mat Inst Met Res Shenyang 110016 Peoples R China State Grid Smart Grid Res Inst Co Ltd State Key Lab Adv Power Transmiss Technol Beijing 102209 Peoples R China Jiangsu JITRI Rd Engn Technol & Equipment Res Inst Xuzhou 220005 Peoples R China shenyang natl lab mat sci Shenyang 110016 Peoples R China Northeastern Univ Sch Mat Sci & Engn Shenyang 110819 Peoples R China Jiangsu Univ sci & Technol Sch Mat Sci & Engn Zhenjiang 212003 Peoples R China

An inorganic potassium silicate coating with pigments of alumina, aluminum phosphate, NiCrAlY and copper chromite black was prepared on CB2 stainless steel. Oxidation behavior in either ambient air or O2 + H2O mixture at 630 degrees C for 20 0 0 h was comparatively studied, and the coating exhibited excellent resistance under both test conditions. The water vapor considerably accelerated the oxidation of the un-coated CB2 steel, as the hydroxide, the main constituent of the coating, had a negligible evaporation rate at test temperature, while it had a limited effect on the coated sample. Meanwhile, the existence of coating may prolong or eliminate the incubation period in the O2 + H2O mixture at 630 degrees C. After oxidation, the coating matrix is in an amorphous state and fillers as alumina and copper chromite black are stable in the coating. Leucite (KAlSi2O6) formed by Al from NiCrAlY and potassium silicate in the coatings was detected after tests either in O2 or O2 + H2O mixture. (c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of materials science & Technology.

关键词： CB2 stainless steel Inorganic silicate coating TEM High-temperature corrosion Oxidation ENHANCED OXIDATION BEHAVIOR PROTECTION VOLATILITY ALLOYS METAL

Effect of cross rolling on the microstructure and mechanical performance of a dual-phase structured Mg-8Li-6Zn-1Y (in wt.%) alloy

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JOURNAL OF matERIALS sciENCE & TECHNOLOGY 2024年第000期176卷 132-144页

作者： Wang, Dongliang Xu, Daokui Wang, Baojie Yan, Changjian Wang, Shuo Xu, Xiangbo Zhang, Lan Lu, Cuilan Chinese Acad sci Key Lab Nucl Mat & Safety Assessment Inst Met Res Shenyang 110016 Peoples R China Univ sci & Technol China Sch Mat Sci & Engn Shenyang 110016 Peoples R China Binzhou Inst Technol Binzhou 256606 Peoples R China Shandong Key lab Adv Aluminium mat & Technol Binzhou 256606 Peoples R China Inst Corros sci & Technol Guangzhou 510070 Peoples R China Northeastern Univ Key Lab Electromagnet Proc Mat Minist Educ Shenyang 110819 Peoples R China shenyang Ligong Univ Sch Environm & Chem Engn Shenyang 110159 Peoples R China

The microstructure and mechanical performance of the unidirectionally and cross-directionally rolled Mg8Li-6Zn-1Y (in wt.%) sheets have been investigated and compared. It reveals that after the unidirectional rolling (UR), the broken I-phase particles are aggregated at the alpha-Mg/ beta-Li phase interfaces. However, the cross-rolling (CR) process can not only severely break the bulk I-phase, but also cause the obviously uniform distribution of I-phase particles in the matrix phases. Moreover, the average grain size of the CR samples is 3.61 mu m and about 50% that of the UR samples. The maximum texture intensities of alpha- Mg and beta-Li phases in the CR samples are slightly stronger than those in the UR samples. Tensile results demonstrate that the CR process can effectively enhance the tensile properties and remarkably reduce the mechanical anisotropy of the alloy. For the UR samples, the yield strength, ultimate tensile strength, and elongation ratio along the rolling direction (RD) are 164 MPa, 198 MPa, and 16.4%, whereas those along the transverse direction (TD) are 157 MPa, 185 MPa, and 22.0%, respectively. For the CR samples, their mechanical properties are basically the same and the mechanical anisotropy is almost eliminated. The yield strength, ultimate tensile strength, and elongation ratio along the cross-rolling direction 1 (CRD1) and 2 (CRD2) are respectively measured to be 181 MPa and 182 MPa, 220 MPa and 218 MPa, 20.6% and 20.7%. Failure analysis indicates that for the UR samples being tensile tested along the RD and TD, micro- cracks are preferentially initiated in the region of aggregated I-phase particles. For the CR samples being tensile tested along both two cross-rolling directions, the initiation of micro-cracks mainly occurs at the I-phase/matrix phase interfaces and in the interior of matrix phases. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of materials science & Technology.

关键词： Magnesium-lithium alloy Cross-rolling I-phase Microstructure Mechanical performance ICOSAHEDRAL PHASE FATIGUE BEHAVIOR CRYSTALLOGRAPHIC TEXTURE ZN/Y RATIO MG RECRYSTALLIZATION ANISOTROPY DEFORmatION FORMABILITY SHEETS

Role of retained austenite in advanced high-strength steel: ductility and toughness

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JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL 2024年第9期31卷 2079-2089页

作者： Nuam, Vung Lam Zhang, Hao Wang, Ying-chun Xiong, Zhi-ping Beijing Inst Technol Sch Mat Sci & Engn Natl Key Lab Sci & Technol Mat Shock & Impact Beijing 100081 Peoples R China Tangshan Res Inst BIT Tangshan Key Lab High Performance Met & Ceram Tangshan 063000 Hebei Peoples R China

Enhancing the ductility and toughness of advanced high-strength steels is essential for the wide range of promising applications. The retained austenite (RA) is a key phase due to the austenite-to-martensite transformation and its transformation-induced plasticity effect. It is commonly accepted that slow RA-to-martensite transformation is beneficial to ductility; therefore, the RA fraction and stability should be carefully controlled. The RA stability is related to its morphology, size, carbon content, neighboring phase and orientation. Importantly, these factors are cross-influenced. It is noteworthy that the influence of RA on ductility and fracture toughness is not consistent because of their difference in stress state. There is no clear relationship between fracture toughness and tensile properties. Thus, it is important to understand the role of RA in toughness. The toughness is enhanced during the RA-to-martensite transformation, while the fracture toughness is decreased due to the formation of fresh and brittle martensite. As a result, the findings regarding to the effect of RA on fracture toughness are conflicting. Further investigations should be conducted in order to fully understand the effects of RA on ductility and fracture toughness, which can optimize the combination of ductility and toughness in AHSSs.

关键词： Retained austenite Ductility Toughness TRIP effect Steel TRANSFORmatION-INDUCED-PLASTICITY WORK-HARDENING BEHAVIOR X-RAY-DIFFRACTION MECHANICAL STABILITY DEFORmatION-BEHAVIOR FRACTURE-TOUGHNESS PARTITIONING STEEL MARTENSITIC-TRANSFORmatION METASTABLE AUSTENITE CRACKING RESISTANCE

Microstructure control and hot cracking behavior of the new Ni-Co based superalloy prepared by electron beam smelting layered solidification technology

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JOURNAL OF matERIALS sciENCE & TECHNOLOGY 2024年第000期175卷 55-71页

作者： Cui, Hongyang Tan, Yi Ning, Lidan Bai, Rusheng You, Xiaogang Cui, Chuanyong Li, Pengting Dalian Univ Technol Sch Mat Sci & Engn Dalian 116024 Peoples R China Key lab Energy Beam Met & Adv mat Preparat Liaonin Dalian 116024 Peoples R China Chinese Acad sci Inst Met Res Superalloys Div Shenyang 110016 Peoples R China

The prevention of hot cracking formation is of utmost importance in the production of the new Ni-Co based superalloys through the utilization of the electron beam smelting layered solidification technique (EBSL), as it ensures exceptional homogeneity and dependable consistency of the specimens. In contrast to previous studies that focused on minimizing the liquid film and solidification range, our methodology adopts a distinct approach. In this research, a novel methodology was employed to mitigate internal stresses through the implementation of equiaxed grain layers via an alternately reduced cooling method. This ultimately resulted in the elimination of hot cracking. To be more specific, the transition from a columnar to an equiaxed structure was observed during the layer-by-layer construction process in the fabrication of the new Ni-Co based superalloy in EBSL. The EBSL-Ni-Co superalloy, when subjected to the alternating reduction cooling method, exhibited an internal stress of 49 MPa. This value represents a significant reduction of 83.8% compared to the internal stress observed when employing the linear reduction cooling method. Additionally, the solvus temperature of the gamma - gamma ' eutectic phases in EBSL-Ni-Co superalloys produced by the alternating reduction cooling method is significantly higher. Intriguingly, the N th layer of the EBSL-Ni-Co based superalloys produced by EBSL simultaneously heats treated with the preceding layers. And the low melting point phase gradually dissolved back into the matrix. The implementation of an alternating reduced cooling method successfully mitigated the formation of the liquid film in the gamma - gamma ' eutectic phase and the buildup of internal stresses in the EBSL-Ni-Co superalloy during its manufacturing process. These discoveries open up a novel preparation procedure pathway for the manufacture of crack-free superalloys with superior mechanical characteristics using EBSL. (c) 2023 Published by Elsevier Ltd on b

关键词： Electron beam smelting layered solidification technology CET Thermal cycling Hot cracking NICKEL-BASED SUPERALLOY INCONEL 718 DEFORmatION-BEHAVIOR SINGLE-CRYSTAL LASER EVOLUTION MECHANISMS COLUMNAR ALLOYS SUSCEPTIBILITY

Single-crystallization of electrolytic copper foils

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JOURNAL OF matERIALS sciENCE & TECHNOLOGY 2024年第000期176卷 112-118页

作者： Li, Xingguang Zhao, Mengze Guo, Quanlin Zhao, Chong Ding, Mingchao Zou, Dingxin Ding, Zhiqiang Zhang, Zhiqiang He, Menglin Liu, Kehai Wu, Muhong Zhang, Zhihong Wang, Enge Fu, Ying Liu, Kaihui Zhang, Zhibin Peking Univ Frontiers Sci Ctr Nanooptoelect Sch Phys State Key Lab Mesoscop Phys Beijing 100871 Peoples R China Songshan Lake mat lab Dongguan 523808 Peoples R China Peking Univ Int Ctr Quantum Mat Collaborat Innovat Ctr Quantum Matter Beijing 100871 Peoples R China Chinese Acad sci Inst Phys Beijing Natl Lab Condensed Matter Phys Beijing 100190 Peoples R China Southern Univ sci & Technol Shenzhen Inst Quantum Sci & Engn Shenzhen 518055 Peoples R China Univ sci & Technol Beijing State Key Lab Adv Met & Mat Beijing 100083 Peoples R China

Depending on the production process, copper (Cu) foils can be classified into two types, i.e., rolled copper (r-Cu) foils and electrolytic copper (e-Cu) foils. Owing to their high electrical conductivity and ductility at low cost, e-Cu foils are employed extensively in modern industries and account for more than 98% of the Cu foil market share. However, industrial e-Cu foils have never been single-crystallized due to their high density of grain boundaries, various grain orientations and vast impurities originating from the electrochemical deposition process. Here, we report a methodology of transforming industrial e-Cu foils into single crystals by facet copy from a single-crystal template. Different facets of both low and high indices are successfully produced, and the thickness of the single crystal can reach 500 mu m. Crystallographic characterizations directly recognized the single-crystal copy process, confirming the complete assimilation impact from the template. The obtained single-crystal e-Cu foils exhibit remarkably improved ductility (elongation-to-fracture of 105% vs . 25%), fatigue performance (the average numbers of cycles to failure of 160 0 vs . 20 0) and electrical property (electrical conductivity of 102.6% of the international annealed copper standard (IACS) vs . 98.5%) than original ones. This work opens up a new avenue for the preparation of single-crystal e-Cu foils and may expand their applications in high-speed, flexible, and wearable devices. (c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of materials science & Technology.

关键词： Electrolytic copper foil Single-crystallization Facet copy Grain growth Mechanical property GRAIN-GROWTH EPITAXIAL-GROWTH CU STRESS CRYSTALS SILVER

Interface engineering and impedance matching strategy to develop core@shell urchin-like NiO/Ni@carbon nanotubes nanocomposites for microwave absorption

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JOURNAL OF matERIALS sciENCE & TECHNOLOGY 2024年第000期176卷 1-12页

作者： Jia, Tianming Hao, Yanling Qi, Xiaosi Rao, Yongchao Wang, Lei Ding, Junfei Qu, Yunpeng Zhong, Wei Guizhou Univ Coll Phys Guizhou Prov Key Lab Photoelect Technol & Applicat Guiyang 550025 Peoples R China Minzu Normal Univ Xingyi Xingyi 562400 Peoples R China Jiangsu Univ sci & Technol Natl Demonstrat Ctr Expt Mat Sci & Engn Educ Zhenjiang 212003 Peoples R China Nanjing Univ Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China Nanjing Univ Jiangsu Prov Lab NanoTechnol Nanjing 210093 Peoples R China

It is well recognized that interfacial effect and/or impedance matching play a great impact on microwave absorption. Herein, we proposed a facile strategy to take full advantage of interface engineering and impedance matching for boosting microwave absorption performance (MAPs). Three-dimensional (3D) hierarchical urchin-like core@shell structured NiO/Ni@CNTs multicomponent nanocomposites (MCNCs) were elaborately constructed and produced in high efficiency through a facile continuous chemical bath deposition, thermal treatment, and catalytic chemical vapor decomposition process. By controlling the pyrolysis time, the NiO/Ni@CNTs urchin-like MCNCs with different lengths and aggregation degrees of CNTs could be selectively synthesized. The obtained results revealed that the enhanced CNT contents provided abundant interfaces and effectively aggrandized their interfacial effects, which resulted in improved polarization loss, conductivity loss, and comprehensive MAPs. Impressively, the interfaces and impedance matching in the designed NiO/Ni@CNTs urchin-like MCNCs could be optimized by regulating the pyrolysis temperature, which further improved the comprehensive MAPs. And the designed NiO/Ni@CNTs urchin-like MCNCs could simultaneously display strong absorption capabilities, broad absorption bandwidths, and thin matching thicknesses. Therefore, our findings not only provided a simple and universal approach to produce core@shell structured magnetic carbon-based urchin-like MCNCs but also presented an interface engineering and impedance matching strategy to develop the tunable, strong absorption, broadband, lightweight high-efficiency microwave absorbers. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of materials science & Technology.

关键词： Urchin-like geometrical morphology NiO/Ni@CNTs multicomponent nanocomposites Core@shell structure Interface engineering Microwave absorption COMPOSITES LIGHTWEIGHT DESIGN HETEROSTRUCTURES EFFICIENCY HYBRID

Hot deformation behavior and hot-metal-gas-forming process of V micro-alloyed high manganese steel

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JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL 2024年第9期31卷 2271-2280页

作者： Yang, Yong-gang Zuo, Wang-nan Xu, Mei Yuan, Chang-hui Chang, Jiang Qi, Lei Mi, Zhen-li Univ sci & Technol Beijing Natl Engn Res Ctr Adv Rolling & Intelligent Mfg Beijing 100083 Peoples R China Taiyuan Iron & Steel Grp Co Ltd State Key Lab Adv Stainless Steel Mat Taiyuan 030003 Shanxi Peoples R China Shandong Taishan Steel Grp Co Ltd Jinan 271100 Shandong Peoples R China

The hot deformation behavior of a newly designed V micro-alloyed high manganese steel (HMnS) was investigated in order to guide the development of the hot-metal-gas-forming process. Single-pass hot compression experiments were conducted in the temperature range of 950-1100 degrees C and the strain rate range of 0.05-10 s-1, and the stress-strain curves and the corresponding softening mechanism of the V micro-alloyed HMnS were analyzed. Results show that two types of stress-strain curves, representing the work hardening (WH)-dynamic recovery (DRV)-dynamic recrystallization (DRX) mechanism and the WH-DRV mechanism, respectively, occur during the deformation process. Moreover, the WH-DRV-DRX mechanism gradually transforms into the WH-DRV mechanism with the increasing strain rate and decreasing deformation temperature. Two types of constitutive models considering the softening mechanism difference were established and verified by additional hot-deformation experiments. Hot processing map of the HMnS was established and correlated well with the microstructure evolution result. Based on the constitutive models and processing map, the optimal processing parameter range and flow stress of HMnS for the hot-metal-gas-forming were determined.

关键词： High manganese steel Hot-metal-gas-forming Deformation behavior Microstructure Softening mechanism MICROSTRUCTURE STRENGTH STRESS MN PRECIPITATION TENSILE CURVE TUBE

Robust Particle Swarm Optimization Algorithm for Modeling the Effect of Oxides Thermal Properties on AMIG 304L Stainless Steel Welds

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CMES-COMPUTER MODELING IN ENGINEERING & sciENCES 2024年第2期141卷 1809-1825页

作者： Djoudjou, Rachid Hedhibi, Abdeljlil Chihaoui Touileb, Kamel Ouis, Abousoufiane Boubaker, Sahbi Abdo, Hani Said Prince Sattam Bin Abdulaziz Univ Coll Engn Al Kharj Dept Mech Engn POB 655 Al Kharj 16273 Saudi Arabia Univ Jeddah Coll Comp Sci & Engn Dept Comp & Network Engn Jeddah 21959 Saudi Arabia Univ Sousse Natl Engn Sch Sousse Lab Mech Sousse LMS Sousse 4054 Tunisia Suez Univ Fac Petr & Min Engn Dept Met & Mat Engn Suez 43512 Egypt

There are several advantages to the MIG (Metal Inert Gas) process, which explains its increased use in various welding sectors, such as automotive, marine, and construction. A variant of the MIG process, where the same equipment is employed except for the deposition of a thin layer of flux before the welding operation, is the AMIG (Activated Metal Inert Gas) technique. This study focuses on investigating the impact of physical properties of individual metallic oxide fluxes for 304L stainless steel welding joint morphology and to what extent it can help determine a relationship among weld depth penetration, the aspect ratio, and the input physical properties of the oxides. Five types of oxides, TiO2, SiO2, Fe2O3, Cr(2)O3, and Mn2O3, are tested on butt joint design without preparation of the edges. A robust algorithm based on the particle swarm optimization (PSO) technique is applied to optimally tune the models' parameters, such as the quadratic error between the actual outputs (depth and aspect ratio), and the error estimated by the models' outputs is minimized. The results showed that the proposed PSO model is first and foremost robust against uncertainties in measurement devices and modeling errors, and second, that it is capable of accurately representing and quantifying the weld depth penetration and the weld aspect ratio to the oxides' thermal properties.

关键词： Activated metal inert gas welding stainless steel activating flux oxides' thermal properties particle swarm optimization ANGULAR DISTORTION PREDICTION PARAMETERS FLUX