Effects of Vacancy Concentration and Temperature on Mechanical Properties of Single-Crystal gamma-TiAl Based on Molecular Dynamics Simulation

doi:10.1515/htmp-2016-0156

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	Effects of Vacancy Concentration and Temperature on Mechanical Properties of Single-Crystal gamma-TiAl Based on Molecular Dynamics Simulation
	Feng Ruicheng1,2 ; Cao Hui1,2 ; Li Haiyan1,2 ; Rui Zhiyuan1,2 ; Yan Changfeng1,2
	2018-02
发表期刊	HIGH TEMPERATURE MATERIALS AND PROCESSES
ISSN	0334-6455
卷号	37 期号:2 页码:113-120
摘要	Molecular dynamics simulation is used to analyze tensile strength and elastic modulus under different temperatures and vacancy concentrations. The effects of temperature and vacancy concentration on the mechanical properties of gamma-TiAl alloy are investigated. The results show that the ultimate stress, ultimate strain and elastic modulus decrease nonlinearly with increasing temperature and vacancy concentration. As the temperature increases, the plastic of material is reinforced. The influence of temperature on strength and elastic modulus is larger than that of vacancy concentration. The evolution process of vacancy could be observed clearly. Furthermore, vacancies with different concentrations develop into voids first as a function of external forces or other factors, micro cracks evolve from those voids, those micro cracks then converge to a macro crack, and fracture will finally occur. The vacancy evolution process cannot be observed clearly owing to the thermal motion of atoms at high temperature. In addition, potential energy is affected by both temperature and vacancy concentration.
关键词	gamma-TiAl alloy molecular dynamics vacancy temperature mechanical properties
DOI	10.1515/htmp-2016-0156
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51665030] ; National Natural Science Foundation of Gansu Province, China[148RJZA008] ; Research project of Gansu Province, China[2014A-033]
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:000423991200002
出版者	WALTER DE GRUYTER GMBH
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/32796
专题	机电工程学院土木工程学院
通讯作者	Cao Hui
作者单位	1.Lanzhou Univ Technol, Mech & Elect Engn Coll, Lanzhou 730050, Gansu, Peoples R China 2.Lanzhou Univ Technol, Key Lab Digital Mfg Technol & Applicat, Minist Educ, Lanzhou, Gansu, Peoples R China
第一作者单位	兰州理工大学
通讯作者单位	兰州理工大学
第一作者的第一单位	兰州理工大学
推荐引用方式 GB/T 7714	Feng Ruicheng,Cao Hui,Li Haiyan,et al. Effects of Vacancy Concentration and Temperature on Mechanical Properties of Single-Crystal gamma-TiAl Based on Molecular Dynamics Simulation[J]. HIGH TEMPERATURE MATERIALS AND PROCESSES,2018,37(2):113-120.
APA	Feng Ruicheng,Cao Hui,Li Haiyan,Rui Zhiyuan,&Yan Changfeng.(2018).Effects of Vacancy Concentration and Temperature on Mechanical Properties of Single-Crystal gamma-TiAl Based on Molecular Dynamics Simulation.HIGH TEMPERATURE MATERIALS AND PROCESSES,37(2),113-120.
MLA	Feng Ruicheng,et al."Effects of Vacancy Concentration and Temperature on Mechanical Properties of Single-Crystal gamma-TiAl Based on Molecular Dynamics Simulation".HIGH TEMPERATURE MATERIALS AND PROCESSES 37.2(2018):113-120.

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