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

Ruifeng Dong ¹Hongchao Kou ²Yuhong Zhao ¹Xiaoyang Zhang ¹Ling Yang ¹Hua Hou¹

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作者信息

1. School of Materials Science and Engineering,North University of China,Taiyuan,030051,China
2. State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an,710072,China
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Abstract

Profound and comprehensive investigations on the morphology characteristics of α precipitates are essential for the microstructural control of metastable β titanium alloys.At the very beginning of aging treatment,intragranular α precipitates with a dot-like morphology begin to generate nearby the dislo-cations,then those dot-like α precipitates 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-like α precipitates gradually combine with each other to form the V-shaped clusters or the triangular ones.The dislocations of{1(-1)0}β < 11 (-1)>β edge type are evidenced within the β grains,and it is found that variant selection ofα precipitates induced by the transformation strain and the interplay between α vari-ants 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 intraguranular α precipitates related to the crystal defects and the strain accommodation of α variants in metastable β titanium alloys.

Key words

Metastable β titanium alloys/α Precipitates/Morphology characteristics/Phase transformation/Strain accommodation/Dislocations

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基金项目

Science and Technol-ogy Major Project of Shanxi Province(20191102008)

Science and Technol-ogy Major Project of Shanxi Province(20181101014)

Applied Basic Research Foundation of Shanxi Province(201901D211255)

Applied Basic Research Foundation of Shanxi Province(201901D211256)

Platform and Talent Project of Shanxi Province(201805D211036)

Guid-ing Local Science and Technology Development Projects by the Central Government(YDZX20191400002796)

Scientific and Technological Innovation Programs of Higher Education Insti-tutions in Shanxi(2020L0304)

Key projects of Equipment Preresearch Foundation(61409230407)

Natural Science Research Project of NUC(XJJ201916)

出版年

2021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量52

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