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Morphology characteristics of α precipitates related to the crystal defects and the strain accommodation of variant selection in a metastableβtitanium alloy

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Journal of Materials Science & Technology 2021年第36期95卷 1-9页

作者： Ruifeng Dong Hongchao Kou Yuhong Zhao Xiaoyang Zhang Ling Yang Hua Hou School of Materials Science and Engineering North University of ChinaTaiyuan030051China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China

Profound and comprehensive investigations on the morphology characteristics ofαprecipitates are essential for the microstructural control of metastableβtitanium alloys.At the very beginning of aging treatment,intragranularαprecipitates with a dot-like morphology begin to generate nearby the dislocations,then those dot-likeαprecipitates with the same crystallographic orientation tend to connect with each other to develop a lath-like morphology.With the progress of aging treatment,the orientated lath-likeαprecipitates gradually combine with each other to form the V-shaped clusters or the triangular ones.The dislocations of{110}_(β)βedge type are evidenced within theβgrains,and it is found that variant selection ofαprecipitates induced by the transformation strain and the interplay betweenαvariants and the dislocations are confirmed as the key factors for the formation of the V-shaped or triangular clusters.The results of this work could provide underlying knowledge on the morphology characteristics of intraguranularαprecipitates related to the crystal defects and the strain accommodation ofαvariants in metastableβtitanium alloys.

关键词： Metastableβtitanium alloys αPrecipitates Morphology characteristics Phase transformation strain accommodation Dislocations

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New insight into deformation induced α variant selection in a metastable β titanium alloy during isothermal compression at 600℃

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Progress in Natural Science:Materials International 2021年第3期31卷 471-476页

作者： Ke Hua Fan Zhang Hongchao Kou Qiong Wan Yongliang Zhang Weimin Gan Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University German Engineering Materials Science Center at MLZ Helmholtz-Center Geesthacht

Variant selection during phase transformation creates a specific transformation texture and finally affects the mechanical properties of the alloys.The transformation lattice deformation associated selection mechanism has not been well addressed.In the present work,the a variant selection in a Ti-7 Mo-3 Nb-3 Cr-3 Al alloy under isothermal compression at low temperature was investigated.The results show that the selection of the a variants is strongly affected by the imposed strain and the load with the dependence on the effective strain distribution induced by macroscopic shape deformation.In the center region of the compressed sample,4 Burgers orientation relationship(BOR) variants orienting in four different directions and forming two sets of ’cross-shaped’ clusters were selected.Such variants consumed the maximum strain contribution to the macroscopic compression.In the edge region of the compressed sample,only 2 BOR variants with 90°/ or 10°/ disorientation relationship were selected.The selection criterion was still obeyed by the variants but with restriction from the local effective strain distribution induced by macroscopic shape deformation.The present work provides the clear information on the interweaving of the imposed compression with the internal lattice deformation and its impact on the β to α transformation variant selection.

关键词： Variant selection Phase transformation Titanium alloy strain accommodation

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