Effect of Grain Size on Mechanical Properties of y-TiAl Alloy by Nanoindentation

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	Effect of Grain Size on Mechanical Properties of y-TiAl Alloy by Nanoindentation
	Cao Peng 2,3; Rui Zhiyuan 2,3; Fu Rong 2,3; Cao Hui 2,3; Yan Changfeng 2,3; Zhe Jianwu 1
刊名	RARE METAL MATERIALS AND ENGINEERING
	2021-06
卷号	50 期号:6 页码:2052-2060
关键词	grain size y-TiAI nanoindentation mechanical properties molecular dynamics
ISSN号	1002-185X
英文摘要	To study the effect of grain size on the mechanical properties and deformation behavior of y-TiAl alloy in nanoindentation process, a polycrystalline y-TiAl model was established by Voronoi method, and the nanoindentation process for different grain sizes was simulated by molecular dynamics method. According to the simulation results, the Load-depth curves of different grain sizes were obtained, and the hardness of y-TiAI alloy with 7 kinds of grain sizes was calculated. The results show that the relationship between hardness and grain size exhibits an inverse Hall-Petch when the grain size is less than 9.9 nm. Meanwhile, the grain boundary activity and dislocation sliding promote the plastic deformation of matrix, and the grain boundary activity plays a major role. However, the relationship between hardness and grain size conforms to Hall-Petch when the grain size exceeds 9.9 nm. The grain boundary has little effect on the plastic deformation, and the plastic deformation of matrix is dominated by dislocation. In addition, the stress transfer and deformation recovery of y-TiAI were analyzed in the nanoindentation process, it was found that the dense grain boundary grid can effectively inhibit the indentation defects and the internal stress transfer to the matrix. When the grain size becomes smaller, the stress distribution will be more uniform under the indenter and the elastic recovery ratio will be smaller along the indentation direction.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
WOS记录号	WOS:000674680700023
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/148906]
专题	土木工程学院机电工程学院
作者单位	1.Gansu Comp Ctr, Lanzhou 730030, Peoples R China 2.Key Lab Digital Mfg Technol & Applicat, Lanzhou 730050, Peoples R China; 3.Lanzhou Univ Technol, Lanzhou 730050, Peoples R China;
推荐引用方式 GB/T 7714	Cao Peng,Rui Zhiyuan,Fu Rong,et al. Effect of Grain Size on Mechanical Properties of y-TiAl Alloy by Nanoindentation[J]. RARE METAL MATERIALS AND ENGINEERING,2021,50(6):2052-2060.
APA	Cao Peng,Rui Zhiyuan,Fu Rong,Cao Hui,Yan Changfeng,&Zhe Jianwu.(2021).Effect of Grain Size on Mechanical Properties of y-TiAl Alloy by Nanoindentation.RARE METAL MATERIALS AND ENGINEERING,50(6),2052-2060.
MLA	Cao Peng,et al."Effect of Grain Size on Mechanical Properties of y-TiAl Alloy by Nanoindentation".RARE METAL MATERIALS AND ENGINEERING 50.6(2021):2052-2060.