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Further mechanism of α/β interphase boundary evolution and dynamic globularization of Ti–5Al–2Sn–2Zr–4Mo–4Cr at elevated temperature deformation

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Progress in Natural Science:Materials International 2022年第4期32卷 490-497页

作者： Lian Li Miaoquan Li School of Materials Science and Engineering Northwestern Polytechnical University

The evolution characterization of the α/β interphase boundaries of the isothermally compressed Ti–5Al–2Sn–2Zr–4Mo–4Cr with lamellar microstructure was carried out via electron backscatter diffraction(EBSD) and transmission electron microscope(TEM). The effect of the α/β interphase boundary evolution on the dynamic globularization was discussed, and the nucleation model for the β recrystallized grain at the cusp of αlath in the late stage of deformation in terms of the classic nucleation theory was established. The mean α/βinterface deviation angle from burgers orientation relationship(BOR) increased continuously up to 18.9°with the increasing strain from 0.1 to 0.5, which was dominated by the continuous dynamic recrystallization. Restoration of BOR between α and β phases at the strains of 0.7 and 0.9 occurred due to the occurrence of recrystallized α andβ grains following BOR, which was rationalized by a nucleation model considering the stored energy of deformation provided the driving force for nucleation at the cusp of α lath. Loss of coherency of α/β interphase boundaries at a strain about 0.3 was responsible for accelerating the dynamic globularization of α lamellae since the energy of α/β interphase boundaries increased up to the maximum value when the non-coherent α/β interphase boundaries were formed. Restoration of coherency of α/β interphase boundaries due to the recrystallization nucleation in the late stage of deformation did not substantially affect the dynamic globularization since the α/αintraphase high-angle boundaries(HAGBs) were formed and the most α/β interphase boundaries were noncoherent.

关键词： Titanium Interphase boundary burgers orientation relationship Dynamic recrystallization Dynamic globularization Model

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Multiple α sub-variants and anisotropic mechanical properties of an additively-manufactured Ti-6Al-4V alloy

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Journal of Materials Science & Technology 2021年第11期70卷 113-124页

作者： Yinling Zhang Zhuo Chen Shoujiang Qu Aihan Feng Guangbao Mi Jun Shen Xu Huang Daolun Chen School of Materials Science and Engineering Tongji UniversityShanghai 201804China Department of Mechanical and Industrial Engineering Ryerson UniversityTorontoOntario M5B 2K3Canada Aerospace Hiwing(Harbin)Titanium Industrial Co. Ltd.Harbin High Tech ZoneHarbin 150028China Shanghai Key Lab.of D&A for Metal-Functional Materials School of Materials Science&EngineeringTongji UniversityShanghai 201804China Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys AECC Beijing Institute of Aeronautical MaterialsBeijing 100095China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China

Additive manu facturing(AM)is a promising material processing method which gains significant momentum in the aerospace and biomedical ***,the anisotropy in the mechanical properties of additively-manufactured materials is still poorly *** study was aimed at elucidating crystallographic feature-anisotropy-mechanical property relationship for a Ti-6Al-4V alloy manufactured via selective electron beam melting(SEBM).Abundantαlamellae with six variants were present inside the columnar prior-βgrains with afiber texture duringβ→αphase *** sixαvariants followed the burgers orientation relationship of{110}_(β)//{0001}_(α)and_(β)//_(α).Multiple sub-variants in eachαvariant were observed for the first *** anisotropy in the mechanical properties was mainly related to the relative amount of sixα*** the horizontally-oriented samples had a lower yield strength,they exhibited a higher ductility and longer fatigue life than the vertically-oriented *** softening occurred at higher strain amplitudes,and cyclic stabilization sustained at lower strain *** crack mainly initiated from the specimen surface at lower strain amplitudes,while multiple crack initiation tended to occur at higher strain *** propagation was characterized by fatigue striations along with some secondary cracks.

关键词： Titanium alloy 3D printing Deformation behavior Anisotropy burgers orientation relationship

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Microstructure and texture evolution in LZ91 magnesium alloy during cold rolling

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Journal of Magnesium and Alloys 2018年第1期6卷 77-82页

作者： Wen-hui Liu Xiao Liu Chang-ping Tang Wei Yao Yang Xiao Xu-he Liu Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province Hunan University of Science and TechnologyXiangtanHunan 411201China Department of Light Metal Zhengzhou Non-ferrous Metals Research Institute Co.Ltd of CHALCOZhengzhou 450041China

LZ91 magnesium alloy extruded sheets were subjected to cold *** microstructure and texture evolution were tracked using optical microscopy(OM)and X-ray diffraction(XRD).Theα-Mg andβ-Li phases were elongated along rolling direction(RD),contributing to the formation of a thin lamellar“sandwich”***“sandwich”structure is favored for glissile dislocation ofα-Mg phase during ***α-Mg andβ-Li phases are near burgers orientation relationship,resulting in an unusual RD texture component in(0002)pole figure.

关键词： LZ91 Microstructure Texture burgers orientation relationship

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