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Experimental and first-principles calculation of TiN growth mechanism on CeAlO_(3) surface in steel

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Journal of Iron and Steel Research(International) 2024年第2期31卷 452-463页

作者： Fei-hu He Jun Peng Fang Zhang Yong-bin Wang Hong-tao Chang School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou014010Inner MongoliaChina

Regular TiN is harmful to the toughness of steel,and its shape and size need to be *** the behavior of TiN precipitation on CeAlO_(3) surfaces is critical for controlling the morphology and formation process of CeAlO_(3)–TiN composite inclusions in the *** results showed that TiN had a square morphology on the CeAlO3 surface,and electron backscatter diffraction phase identification results revealed the orientation relationship between CeAlO_(3) and TiN as follows:(001)_(CeAlO_(3))//(110)_(TiN),(100)_(CeAlO_(3))/(001)_(TiN),and[010]_(CeAlO_(3))/[110]_(TiN).The CeAlO3 crystal structure was studied using the first-principles calculation method,and the adsorption and growth process of TiN on the CeAlO_(3) surface were investigated from the atomic *** calculation results indicate that there is no metallic bonding present in the CeAlO_(3) *** the low-index crystal planes of CeAlO_(3),the(110)planes terminated with O and CeAlO have the highest and lowest surface energies,respectively,with values of 0.373 and 0.051 eV/Å^(2).On the high surface energy plane of CeAlO_(3),the TiN atomic permutation structure is consistent with the arrangement of Ti and N atoms in TiN(100)or(110).For the low surface energy plane of CeAlO_(3),the Ti and N atoms are arranged in a ring-like structure.

关键词： CeAlO_(3)-TiN inclusion orientation relationship Crystal structure First principle Surface energy

Effect of Bimodal Quasicrystal Phase on the Dynamic Recrystallization of Mg–Zn–Gd Alloy during High-Pressure Torsion

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Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1128-1134页

作者： Ping Li Shuangwu Xia Junfu Dong Liangwei Dai Zhicheng Luo Kemin Xue School of Material Science and Engineering Hefei University of TechnologyHefei230009China

The Mg–Zn–Gd alloy with quasicrystal icosahedral phase was processed by high-pressure torsion (HPT). The effect of bimodal I-phase on the dynamic recrystallization was analyzed by transmission electron microscopy. The results showed that the block I-phase can stimulate obvious particle-stimulated nucleation and dynamic recrystallization (DRX) grains were preferentially formed after HPT for 5 turns, while the granular I-phase only promoted the generation of sub-grains. The orientation relationship was determined as twofold//[1210] and fivefold//(0002)_(Mg). Moreover, after HPT for 9 turns, the DRX grains induced by block I-phase appeared to grow up and coarsened. Compared with block I-phase, the grains induced by granular I-phase presented much smaller size and distributed more homogeneous due to the strong pinning effect.

关键词： High-pressure torsion(HPT)-Quasicrystal phase Dynamic recrystallization Particle-stimulated nucleation orientation relationship

Revealing the phase-transformation path in a FeCoNiSnx eutectic high entropy alloy system by crystallographic orientation relationships

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Journal of Materials Science & Technology 2023年第25期156卷 92-106页

作者： Jianbao Zhang Dexu Cui Xin Li Yixuan He Haifeng Wang Weimin Liu State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi'an 710072China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

High entropy alloys are the focus of current *** accurate description of their phase-transformation path,however,is a challenge when their phase constituent and transformation process are *** this study,a FeCoNiSn x eutectic high entropy alloy(EHEA)system was investigated and a novel FeCoNiSn EHEA composed of BCC+HCP phases was *** transition from the hypoeutectic to the fully eutectic and then to the hypereutectic microstructure with the Sn addition was characterized by the electron backscatter diffraction(EBSD)technology,and the phase-transformation path was clari-fied by crystallographic orientation *** studies reveal that the primary phase of FeCoNiSn x(x=0.2,0.4)is FCC structure,and a further Sn addition induces an obvious phase-transformation from FCC to BCC in both the primary phase and eutectic lamellar,which satisfies the Kurdjumov-Sachs(K-S)or Nishiyama-Wasserman(N-W)variant orientation *** mechanical results confirm that the phase structure and microstructure transition caused by Sn addition do significantly improve the strength and hardness of FeCoNiSn x EHEAs,but have serious adverse effects on *** study would be of significance to understanding the phase-transformation process in HEAs and preparing the HEAs with aimed mechanical properties.

关键词： Eutectic high-entropy alloy orientation relationship Phase-transformation Microstructure FeCoNiSn

Four new orientation relationships of Mg_(17)Al_(12) phase with magnesium matrix in Mg-8Al-0.5Zn alloys

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Journal of Magnesium and Alloys 2023年第12期11卷 4689-4695页

作者： Feiya Liu Renlong Xin Xin Wen Xinfu Gu Qing Liu Joint International Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversitySha Zheng Jie 174Sha Ping Ba District Chongqing 400044China National Engineering Research Center for Mg Alloys Chongqing UniversityChongqingChina School of Materials Science and Engineering University of Science and Technology BeijingBeijingChina Key Laboratory for Light-weight Materials Nanjing Tech UniversityNanjingChina

Although the non-basal precipitates, those not parallel to the basal plane, are more effective to block basal slip in Mg-Al alloys, the crystallographic orientation relationship(OR) between these precipitates and the α-Mg matrix has not been well established. In this work, the crystallography of the non-basal Mg_(17)Al_(12) precipitates in AZ80 alloy was systematically investigated by transmission electron microscopy(TEM). By tilting to a suitable electron beam direction, different kinds of non-basal precipitates were recognized in TEM, and the following four new ORs between the non-basal Mg_(17)Al_(12) precipitates and the matrix were revealed: ■, and ■.Furthermore, these ORs and their habit planes were explained using the edge-to-edge matching model. The findings in this work can provide some guidelines for designing the microstructure of Mg-Al alloys to enhance their precipitation hardening potential.

关键词： Mg alloys Precipitate orientation relationship Crystallography Edge-to-edge matching model

orientation relationships between Ferrite and Cementite by Edge-to-edge Matching Principle

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Journal of Materials Science & Technology 2011年第5期27卷 475-480页

作者： Ning Zhong Xiaodong Wang Zhenghong Guo Yonghua Rong Institute of Marine Materials Science and Engineering Shanghai Maritime University Shanghai 201306 China School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

The crystallographic features of pearlite were investigated by experiments and edge-to-edge matching principle. Two new orientation relationships between ferrite and cementite were determinated by selected area electron diffraction and then explained by our modified edge-to-edge matching method. The consistence of the experimental results with theoretical prediction confirms the practicability of the modified edge-to-edge matching model.

关键词： orientation relationship Pearlite Edge-to-edge matching Transmission electronmicroscopy

Special orientation relationships Observed at the Early Stages of Recrystallization in Pure AlMn Alloy

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International Journal of Minerals,Metallurgy and Materials 1998年第3期12卷 140-146页

作者： Ping Yang(Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China)(Institute for Metal Science and Metal Physics, Aachen University of Technology, D-52056, Aachen, Germany) Material Science and Engineering School University of Science and Technology Beijing Beijing 100083 China Institute for Metal Science and Metal Physics Aachen University of Technology D-52056 Aachen Germany

Electron Back Scattering Diffraction (EBSD) technique in a SEM was used to obtain local orientationalinformation on new grains and their surrounding deformed matrices at the early stages of recrystallization in pureA1-1 .3%Mn alloy. Results show that special orientation relationships including twin-relationship often exist betweennew grains, between new grains and deformed grains or between deformed grains. The occurrence of such specialorientation relationships is attributed to the special deformation behavior in the samples with large initial grain *** formation of recrystallization twins is discussed in a different way to those of traditional ones.

关键词： orientation relationship recrystallization AlMn, EBSD

A Quantitative Study on the Effect of Heat Treatment on the Microstructure and orientation of Titanium Hydride in Electrochemically Hydrogenated Pure Titanium

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Acta Metallurgica Sinica(English Letters) 2022年第12期35卷 2057-2068页

作者： Changzheng Li Yunchang Xin Guangjie Huang Qing Liu International Joint Laboratory for Light Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400030China Key Laboratory for Light-Weight Materials Nanjing Tech UniversityNanjing 210009China

The electrochemical hydrogen charging of pure titanium and its alloys has been investigated previously,while how a subsequent annealing treatment aff ects the type of hydride and its orientation relationship with matrix is not *** the present study,a quantitative study on the microstructure and orientation of titanium hydrides during electrochemical hydrogen charging and subsequent annealing treatment was carried out using scanning electron microscopy,transmission electron microscopy and electron backscatter diff *** results show thatδ-hydride is the main in both the electrochemically hydrogenated sample and the subsequent annealing treated *** electrochemical hydrogen charging for 48 h,the surface is mainly composed of denseδ-hydride with a thickness of approximately 42μm,the orientation relationship betweenα-matrix andδ-hydride follows only the orientation relationship of OR2,{0001}_(α)//{111}_(δ),_(α)//_(δ) and an interface plane{1013}_(a)//{110}_(δ).Besides OR2,a part of hydrides show an orientation relationship of OR1 with the matrix after annealing,{0001}a//{001}_(δ),_(a)//{110}_(δ) and an interface plane of {1010}_(δ)//{110}_(δ).It is further found that the relative frequency of OR1and OR2 is closely related to annealing *** an argon atmosphere at 450℃,the frequencies of OR1 and OR2 are nearly balance with an annealing time of 12 h,while OR1 becomes to be the predominant one with a relative frequency of 96.5%after annealing for 96 *** mechanism for the evolution of orientation relationship of hydrides with annealing time was discussed.

关键词： Titanium alloys Titanium hydride Heat treatment Microstructure orientation relationship

Influence of cooling rate on phase transformation and precipitation behavior of Ti-bearing steel in continuous cooling process

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Journal of Iron and Steel Research(International) 2022年第1期29卷 165-174页

作者： Xiao-lin Li Chi Jin Hao-zhe Li Xiao-xiao Hao Yi He Xiang-tao Deng Zhao-dong Wang State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

The influence of cooling rate on microstructural evolution and precipitation behavior in Ti,Ti–Nb and Ti-Mo low-carbon steels during the continuous cooling process was studied by dilatometer method,optical microscopy,and transmission electron *** results indicated that austenite transformation temperature decreased with the increasing cooling rate in three *** addition of Nb and Mo promoted bainite and martensite transformation and improved the hardenability of *** addition,precipitates formed in deformed austenite and ferrite can be observed *** in the austenite non-recrystallization zone can introduce a large number of deformation bands,and then,the precipitates preferentially nucleated in these deformation *** the following process,randomly distributed precipitates and interphase precipitates will be formed in *** precipitates formed in deformed austenite obey Kurdjumov-Sachs orientation relationship with the matrix,while the precipitates formed in ferrite obey Baker-Nutting orientation relationship with the *** addition of Nb and Mo in Ti-bearing steels decreased the precipitates size and increased the number density of precipitates and then improved the precipitation *** the effect of Mo addition is more obvious than that of Nb addition.

关键词： Ti-microalloyed steel Continuous cooling transformation Precipitation behavior Precipitate-free zone orientation relationship

Crystallography of the martensitic transformation between Ni_2In-type hexagonal and TiNiSi-type orthorhombic phases

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Journal of Materials Science & Technology 2022年第9期104卷 59-66页

作者： Tingting Zhang Yuanyuan Gong Bin Wang Dongyu Cen Feng Xu MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology Nanjing University of Science and TechnologyNanjing 210094China

MnMX(M=Co or Ni,X=Si or Ge)alloys,experiencing structural transformation between Ni_(2) In-type hexagonal and TiNiSi-type orthorhombic phases,attract considerable attention due to their potential applications as room-temperature solid *** lots of studies have been carried out on how to tune this transformation and obtain large entropy change in a wide temperature region,the crystallography of this martensitic transformation is still *** biggest obstacle for crystallography investigation is to obtain a bulk sample,in which hexagonal and orthorhombic phases coexist,because the MnMX alloys will fragment into powders after experiencing the *** this reason,we carefully tune the transformation temperature to be slightly below 300 *** that case,a bulk sample with small amounts of orthorhombic phases distributed in hexagonal matrix is *** importantly,there are no cracks between the two *** facilities us to investigate the microstructure using electron *** obtained results indicate that the orientation relationship between hexagonal and orthorhombic structures is[4223]_(h)//[120]_(o)&(0110)_(h)//(001)_(o) and the habit plane is{2113.26}_(h).WLR theory is also adopted to calculate the habit *** calculated result agrees well with the measured *** work reveals the crystallography of hexagonal-orthorhombic transformation for the first time and is helpful for understanding the transformation-associated physical effects in MnMX alloys.

关键词： Martensitic transformation MnMX alloys orientation relationship Habit plane Crystallography of martensitic transformation