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Journal of Materials Science & Technology 2024年第20期187卷 86-100页

作者： Hao Tang Xiaoying Xi Chaofeng Gao Zhongqiang Liu Jiantao Zhang Weiwen Zhang Zhiyu Xiao Jeremy Heng Rao National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510641China Institute of Advanced Additive Manufacturing Ji Hua LaboratoryFoshan 528000China Well Technology Company Limited Foshan 528225China

In this work,a high-strength crack-free TiN/Al-Mn-Mg-Sc-Zr composite was fabricated by laser powder bed fusion(L-PBF).A large amount of uniformly distributed L1_(2)-Al_(3)(Ti,Sc,Zr)nanoparticles were formed during the L-PBF process due to the partial melting and decomposition of TiN nanoparticles under a high *** L1_(2)-Al_(3)(Ti,Sc,Zr)nanoparticles exhibited a highly coherent lattice relationship with the Al *** the prepared TiN/Al-Mn-Mg-Sc-Zr composite samples exhibit ultrafine grain *** addition,the as-built composite containing 1.5 wt%TiN shows an excellent tensile prop-erty with a yield strength of over 580 MPa and an elongation of over 8%,which were much higher than those of wrought 7xxx *** effects of various strengthening mechanisms were quantitatively estimated and the high strength of the alloy was mainly attributed to the refined microstructure,solid solution strengthening,and precipitation strengthening contributed by L1_(2)-Al_(3)(Ti,Sc,Zr)nanoparticles.

关键词： Laser powder bed fusion Aluminum matrix composites Heterogeneous nucleation strengthening mechanisms Mechanical performance

Fundamental strengthening mechanisms of ordered gradient nanotwinned metals

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Nano Research 2023年第11期16卷 12430-12437页

作者： Zhao Cheng Lei Lu Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Ordered structures with functional units offer the potential for enhanced performance in metallic *** these structures,gradient nanotwinned(GNT)microstructures demonstrate excellent *** paper provides a comprehensive review of the current state-of-the-art studies on GNT structures,encompassing various aspects such as design strategies,mechanical properties characterization,spatially gradient strain evolution analysis,and the significant role of geometrically necessary dislocations(GNDs).The primary objective is to systematically unravel the fundamental strengthening mechanisms by gaining an in-depth understanding of the deformation behavior of nanotwinned *** this work,we aim to contribute to the broader field of materials science by consolidating knowledge and providing insights for the development of novel metallic materials with enhanced properties and tailored performance characteristics.

关键词： metallic material ordered design nanotwin units trans-scale strengthening mechanisms

Coarsening kinetics and strengthening mechanisms of core-shell nanoscale precipitates in Al-Li-Yb-Er-Sc-Zr alloy

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Journal of Materials Science & Technology 2021年第2期61卷 197-203页

作者： Yang Wang Shun Zhang Ruizhi Wu Nodir Turakhodjaev Legan Hou Jinghuai Zhang Sergey Betsofen Key Laboratory of Superlight Materials&1 Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China College of Science Heihe UniversityHeihe 164300China Department of Machine Building Tashkent State Technical UniversityTashkent 100056Uzbekistan Moscow Aviation Institute National Research UniversityMoscow 109383Russia

The tailored nanoparticles with a complex core/shell structure can satisfy a variety of demands, such as lattice misfit, shearability and coarsening resistance. In this research, core-shell nanoscale Al3(Yb, Er, Sc,Zr, Li) composite particles were precipitated in Al-2 Li-0.1 Yb-0.1 Er-0.1 Sc-0.1 Zr(wt%) alloy through the double-aging treatment, in which the core was(Yb, Er, Sc, Zr)-rich formed at 300°C and the shell was Li-rich formed at 150°C. The coarsening kinetics and precipitate size distributions(PSDs) of Al3(Yb, Er, Sc,Zr, Li) particles aged at 150°C previously aged at 300°C for 24 h showed a better fit to the relation of 2∝ kt and normal distribution, indicating that the coarsening of precipitates was controlled by interface reaction, not diffusion. The Orowan bypass strengthening was operative mechanism at 150°C.

关键词： Al-Li alloys Aging Core-shell structure Coarsening kinetics strengthening mechanisms

Superior mechanical properties and strengthening mechanisms of lightweight AlxCrNbVMo refractory high-entropy alloys(x=0,0.5,1.0)fabricated by the powder metallurgy process

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Journal of Materials Science & Technology 2021年第10期69卷 32-41页

作者： Byungchul Kang Taeyeong Kong Ho Jin Ryu Soon Hyung Hong Department of Material Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea

Light and strong AlxCrNbVMo(x=0,0.5,and 1.0)refractory high-entropy alloys(RHEAs)were designed and fabricated via a the powder metallurgical *** microstructure of the AlxCrNbVMo alloys consisted of a single BCC crystalline structure with a sub-micron grain size of 2-3μm,and small amounts(strengthening contributions,showed that the solid solution strengthening,arising from a large misfit effect due to the size and modulus,and the high shear modulus of matrix,was revealed to predominant strengthening mechanism,accounting for over 50%of the yield strength of the AlxCrNbVMo RHEAs.

关键词： High-entropy alloy Powder metallurgy Refractory strengthening mechanisms Oxide dispersoids

Analysis of local microstructure and strengthening mechanisms in adjustable-gap bobbin tool friction stir welds of Al-Mg

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International Journal of Minerals,Metallurgy and Materials 2022年第8期29卷 1589-1595页

作者： Dong Wu Wenya Li Qiang Chu Yangfan Zou Xichang Liu Yanjun Gao State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi’an 710072China Capital Aerospace Machinery Company Beijing 100076China

The bobbin tool friction stir welding process was used to join 6 mm thick 5A06 aluminum alloy *** microscope was used to characterize the *** electron backscatter diffraction(EBSD)identified the effect of non-homogeneous microstructure on the tensile *** was observed that the grain size in the top of the stir zone(SZ)is smaller than that in the centre *** lowest ratio of recrystallization and density of the geometrically-necessary dislocations(GNDs)in the SZ was found in the middle near the thermo-mechanically affected zone(TMAZ)being 22%and 1.15×10^(−13) m^(−2),*** texture strength of the heat-affected zone(HAZ)is the largest,followed by that in the SZ,with the lowest being in the *** were additional interfaces developed which contributed to the strengthening mechanism,and their effect on tensile strength was *** tensile tests identified the weakest part in the joint at the interfaces,and the specific reduction value is about 93 MPa.

关键词： friction stir welding bobbin-tool local microstructure strengthening mechanisms adjustable-gap

Microstructure evolution and strengthening mechanisms of spray-formed 5A12 Al alloy processed by high reduction rolling

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Transactions of Nonferrous Metals Society of China 2017年第11期27卷 2363-2370页

作者： Cai-he FAN Xi-hong CHEN Xin-peng ZHOU Ling OU Jian-jun YANG Ying-biao PENG College of Metallurgy and Material Engineering Hunan University of Technology Zhuzhou 412007 China CRRC Zhuzhou Electric Locomotive Co. Ltd. Zhuzhou 412007 China

The extrusion preform of the spray-formed5A12Al alloy was hot rolled using high reduction rolling *** means of transmission electron microscopy(TEM),electron backscatter diffraction(EBSD)and energy dispersive spectroscopy(EDS),the microstructure evolution was studied and the strengthening and toughening mechanism was thereby *** results indicate that discontinuous and continuous dynamic recrystallization occurred during the hot rolling deformation of the spray-formed5A12Al *** grain size was significantly refined and the micro-scale grains *** dynamic recrystallization leads to a significant increase of dislocation density and cellular *** Mg atoms were distributed in the Al matrix mainly in the presence of solid solution rather than the formation of *** solid solution of Mg atoms not only hindered the dislocation motion and increased the density of dislocation,but also exhibited a remarkable solid solution strengthening effect,which contributes to the high strength and high toughness of the as-rolled *** tensile strength and elongation of spray formed5A12Al alloy at room temperature after3passes hot rolling were622MPa and20%,respectively.

关键词： 5A12 Al alloy spray forming rolling microstructure strengthening mechanisms

Experiments and modeling of double-peak precipitation hardening and strengthening mechanisms in Al-Zn-Mg alloy

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Transactions of Nonferrous Metals Society of China 2014年第7期24卷 2138-2144页

作者：聂小武张利军杜勇中南大学粉末冶金国家重点实验室长沙410083 湖南铁路科技职业技术学院机车车辆学院株洲412000

The aim of the present work is to develop a model for simulating double-peak precipitation hardening kinetics in Al-Zn-Mg alloy with the simultaneous formation of different types of precipitates at elevated temperatures based on the modified Langer-Schwartz approach. The double aging peaks are present in the long time age-hardening curves of Al-Zn-Mg alloys. The physically-based model, while taking explicitly into account nucleation, growth, coarsening of the new phase precipitations and two strengthening mechanisms associated with particle-dislocation interaction （shearing and bypassing）, was used for the analysis of precipitates evolution and precipitation hardening during aging of Al-Zn-Mg alloy. Model predictions were compared with the measurements of Al-Zn-Mg alloy. The systematic and quantitative results show that the predicted hardness profiles of double peaks via adding a shape dependent parameter in the growth equation for growth and coarsening generally agree well with the measured ones. Two strengthening mechanisms associated with particle-dislocation interaction （shearing and bypassing） were considered operating simultaneously in view of the particle size-distribution. The transition from shearing to bypassing strengthening mechanism was found to occur at rather early stage of the particle growth. The bypassing was found to be the prevailing strengthening mechanism in the investigated alloys.

关键词： Al-Zn-Mg alloy double-peak precipitation precipitation hardening modelling mechanical properties strengthening mechanisms

Effects of the extrusion parameters on microstructure,texture and room temperature mechanical properties of extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 136-146页

作者： Chenjin Zhang Guangyu Yang Lei Xiao Zhiyong Kan Jing Guo Qiang Li Wanqi Jie State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108China College of Chemistry and Environmental Science Qujing Normal UniversityQujing 655011China

Microstructure,texture,and mechanical properties of the extruded Mg-2.49Nd-1.82Gd-0.2Zn-0.2Zr alloy were investigated at different extrusion temperatures(260 and 320℃),extrusion ratios(10:1,15:1,and 30:1),and extrusion speeds(3 and 6 mm/s).The experimental results exhibited that the grain sizes after extrusion were much finer than that of the homogenized alloy,and the second phase showed streamline distribution along the extrusion direction(ED).With extrusion temperature increased from 260 to 320℃,the microstructure,texture,and mechanical properties of alloys changed *** dynamic recrystallization(DRX)degree and grain sizes enhanced as the extrusion ratio increased from 10:1 to 30:1,and the strength gradually decreased but elongation(EL)*** the extrusion speed increased from 3 to 6 mm/s,the grain sizes and DRX degree increased significantly,and the samples presented the typical-rare-earth(RE)*** alloy extruded at 260℃ with extrusion ratio of 10:1 and extrusion speed of 3 mm/s showed the tensile yield strength(TYS)of 213 MPa and EL of 30.6%.After quantitatively analyzing the contribution of strengthening mechanisms,it was found that the grain boundary strengthening and dislocation strengthening played major roles among strengthening *** results provide some guidelines for enlarging the industrial application of extruded Mg-RE alloy.

关键词： Mg-rare earth alloys extrusion temperature extrusion ratio extrusion speed strengthening mechanisms

Effects of carbon content on the microstructure and tensile properties of a low-density steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 391-401页

作者： Yongxuan Shang Mingyu Fan Shuyong Jiang Zhongwu Zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Metal Material for Marine Equipment and Application Iron&Steel Research Institute of Ansteel Group CorporationAnshan 114009China

Carbon can change the phase components of low-density steels and influence the mechanical *** this study,a new method to control the carbon content and avoid the formation ofδ-ferrite by decarburization treatment was *** microstructural changes and mechanical characteristics with carbon content induced by decarburization were systematically ***-Jaoul(C-J)analysis was employed to examine the work hardening characteristics during the tensile *** decarburization by heat treatments,the carbon content within the austenite phase decreased,while Mn and Al were almost unchanged;this made the steel with full austenite transform into the austenite and ferrite dual ***,(Ti,V)C carbides existed in both matrix phase and the mole fraction almost the *** addition,the formation of other carbides *** loss induced a decrease in strength due to the weakening of the carbon solid *** the steel with the single austinite,the deformation mode of austenite was the dislocation planar glide,resulting in the formation of *** the dual-phase steel,the deformation occurred by the dislocation planar glide of austenite first,with the increase in strain,the cross slip of ferrite took place,forming dislocation cells in *** the late stage of deformation,the work hardening of austinite increased rapidly,while that of ferrite increased slightly.

关键词： low-density steels carbon content decarburization strengthening mechanisms work hardening behavior

The relationship between thermo-mechanical history,microstructure and mechanical properties in additively manufactured CoCrFeMnNi high entropy alloy

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Journal of Materials Science & Technology 2021年第18期77卷 187-195页

作者： Hongge Li Yongjiang Huang Jianfei Sun Yunzhuo Lu School of Materials Science and Engineering Harbin Institute of TechnologyHarbinChina School of Materials Science and Engineering Dalian Jiaotong UniversityDalianChina

Here,a single-track CoCrFeMnNi high entropy alloy(HEA)was successfully fabricated by laser melting deposition(LMD).Combining the experimental observations and numerical simulation,the microstructure and mechanical properties of the as-deposited parts were systematically studied from the perspective of thermo-mechanical history experienced during the LMD *** strengthening mechanisms of the LMDed CoCrFeMnNi HEA parts were *** frictional stress strengthening,grain boundary strengthening and dislocation strengthening contributed the whole yield strength of the *** strengthening dominated the strengthening *** was expected that the establishment of the relationship between thermo-mechanical history,microstructure and mechanical properties of the LMDed CoCrFeMnNi HEA could shed more insights into achieving HEA parts with the desired microstructure and high performance.

关键词： Laser melting deposition High entropy alloy Thermo-mechanical history Microstructure Mechanical property strengthening mechanisms