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Post-yielding dislocation retraction of nano-lamellar TiAl single crystals

Post-yielding dislocation retraction of nano-lamellar TiAl single crystals

作     者:HengGao Xiang WanLin Guo HengGao Xiang;WanLin Guo

作者机构:State Key Laboratory of Mechanics and Conirol of Mechanical StrucuresNanjing University of Aeronautics and AstronauticsNanjing 210016China 

出 版 物:《Science China(Physics,Mechanics & Astronomy)》 (中国科学:物理学、力学、天文学(英文版))

年 卷 期:2021年第64卷第6期

页      面:74-82页

核心收录:

学科分类:07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0703[理学-化学] 0702[理学-物理学] 

基  金:supported by the National Key Research and Development Program of China(Grant No.2019YFA0705400) the National Natural Science Foundation of China(Grant No.51535005) the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures(Grant No.MCMS-I-0419K01) the Fundamental Research Funds for the Central Universities(Grant Nos.NJ2020003,and NZ2020001) a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions 

主  题:post-yielding dislocation retraction single crystals nano-lamellar 

摘      要:The perfect single crystal has ultra-high strength but is often accompanied by catastrophic failures after *** study reveals that nano-lamellar TiAl single crystals alleviate the catastrophic failure due to a post-yielding dislocation retraction through atomistic simulations and theoretical *** dislocation retraction leads to a retained post-yielding strength of1.03 to 2.33 GPa(about 50%of the yielding strength).It is shown that this dislocation retraction is caused by local stress relaxation and interface-mediated image *** local stress relaxation is due to successive dislocation nucleation in different slip systems,and the interface-mediated image force is caused by the heterogeneous *** on dislocation theory,this study demonstrates that the size effect also plays a vital role in dislocation *** modeling shows that the dislocation retraction occurs when the lamellar thickness is less than approximately 12 ***,the post-yielding dislocation retraction is more pronounced at higher temperatures,making it more effective in alleviating catastrophic *** findings demonstrate a viable option for avoiding catastrophic failure of single crystals through nanoscale-lamellar design.

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