Selection and mechanical evaluation of gamma/gamma boundary in gamma-TiAl alloy

doi:10.1016/j.intermet.2020.106946

CORC > 金属研究所 > 中国科学院金属研究所

	Selection and mechanical evaluation of gamma/gamma boundary in gamma-TiAl alloy
	Zhang, Jinhu 2; Teng, Chunyu 3; Meng, Zhichao 1,2; Xu, Haisheng 1,2; Yang, Liang 2; Xu, Dongsheng 1,2; Yang, Rui 1,2
刊名	INTERMETALLICS
	2020-11-01
卷号	126 页码:11
关键词	Titanium alloy Elastic strain energy Interfacial energy difference gamma/gamma boundary Phase field model Molecular dynamics method
ISSN号	0966-9795
DOI	10.1016/j.intermet.2020.106946
通讯作者	Zhang, Jinhu(jinhuzhang@imr.ac.cn) ; Xu, Dongsheng(dsxu@imr.ac.cn)
英文摘要	Simulation of lamellar boundary (gamma/gamma) selection during the transformation of alpha(2)'->alpha(2)+gamma in gamma-TiAl alloy has been investigated using an improved 3D Phase Field (PF) model, and the mechanical properties of gamma/gamma boundaries are evaluated by Molecular Dynamics (MD) simulation. The effects of elastic strain energy and interfacial energy difference among different types of gamma/gamma interfaces on the occurrence frequencies of the three types of gamma/gamma boundaries (i.e., true twin (TT), pseudo-twin (PT) and ordered domain (OD)) have been studied. It is found that the boundary fraction of TT increases with increasing elastic strain energy or increasing interfacial energy difference among gamma/gamma interfaces. Besides TT, the elastic interaction also favors OD while PT is suppressed. The relative fractions of PT and OD could be effectively controlled by elastic strain energy. Furthermore, the frequency of PT or OD can also be adjusted by their interface energy ratio. The simulation results well explain the phenomenon that boundary frequencies via experimental statistics deviate from those under random distribution without interface selection. It can also be found that one-twin-dominant zones (OTDZ) can be induced by higher elastic strain energy and larger interface energy difference among different gamma/gamma boundaries through the merging of adjacent small clusters with the same gamma/gamma boundary type under the premise of correlated and sympathetic nucleation. Through MD simulation, it is found that the strengths of the configurations with true twin boundary (TTB) and ordered domain boundary (ODB) are almost the same, while the strength of that with pseudo-twin boundary (PTB) is relatively low. The order of plasticity of the configurations with three types of gamma/gamma interfaces is ODB > TTB > PTB.
资助项目	National Key Research and Development Program of China[2016YFB0701304] ; Chinese Academy of Sciences[XDC01040100] ; Chinese Academy of Sciences[XXH13506-304] ; Doctoral Scientific Research Foundation of Liaoning Province[20180540133]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000579759400030
资助机构	National Key Research and Development Program of China ; Chinese Academy of Sciences ; Doctoral Scientific Research Foundation of Liaoning Province
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/140927]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, Jinhu; Xu, Dongsheng
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 3.AVIC China Aeropolytechnol Estab, Beijing 100028, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Jinhu,Teng, Chunyu,Meng, Zhichao,et al. Selection and mechanical evaluation of gamma/gamma boundary in gamma-TiAl alloy[J]. INTERMETALLICS,2020,126:11.
APA	Zhang, Jinhu.,Teng, Chunyu.,Meng, Zhichao.,Xu, Haisheng.,Yang, Liang.,...&Yang, Rui.(2020).Selection and mechanical evaluation of gamma/gamma boundary in gamma-TiAl alloy.INTERMETALLICS,126,11.
MLA	Zhang, Jinhu,et al."Selection and mechanical evaluation of gamma/gamma boundary in gamma-TiAl alloy".INTERMETALLICS 126(2020):11.