Variant selection map of external load during Ni4Ti3 precipitation in nitinol:a theoretical and phase field study
周学伟 1张天隆 2程利 1杨许生 3朱家明4
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作者信息
1. School of Civil Engineering,Shandong University,Jinan 250061,China
2. Department of Mechanical Engineering,Hong Kong University of Science and Technology,Hong Kong,China
3. State Key Laboratory of Ultra-precision Machining Technology,Department of Industrial and Systems Engineering,The Hong Kong Polytechnic University,Hong Kong,China
4. School of Civil Engineering,Shandong University,Jinan 250061,China;Shenzhen Research Institute of Shandong University,Shenzhen 518057,China;Institute of Materials Intelligent Technology Shenyang 110004,China
The morphology of Ni4Ti3 precipitates is important in tuning the martensitic transformation(MT)behavior and mechanical properties of nitinol.Constrained ageing is effective in engineering the morphology of Ni4Ti3 precipitates due to the variant selection effect of external load which is still lacking.In this work,maps of variant selection effect of external load applied along all crystallographic directions are obtained by using a combination of theoretical analyses and phase field simu-lations.It is found that maps produced by uniaxial tension and uniaxial compression are quite different.The number and types of Ni4Ti3 variants preferred by external load vary as the loading direction changes.Moreover,factors influencing the strength of variant selection effect are discovered.This work provides insights on understanding the Ni4Ti3 precipitation process and sheds light on the engineering of morphology of Ni4Ti3 precipitates for desired mechanical and functional properties.
关键词
Ni4Ti3/Variant selection/NiTi alloy/Phase field model/Precipitation morphology
Key words
Ni4Ti3/Variant selection/NiTi alloy/Phase field model/Precipitation morphology
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基金项目
National Natural Science Foundation of China(12372152)
Qilu Young Talent Program of Shandong University,Zhejiang Lab Open Research Project(K2022PE0AB05)
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