Study on fracture behavior of gamma-TiAl based alloys

	Study on fracture behavior of gamma-TiAl based alloys
	Cao, R.1; Chen, J. H.; Zhang, J.2
	2007
关键词	TiAl alloys fracture process fracture mechanism
卷号	546-549
页码	1437-+
英文摘要	Fracture behavior of fully lamellar (FL) and duplex phase (DP) TiAl alloys is reported in this paper. It was found that the inverse behavior of coarse FL TiAl alloy showing inferior tensile properties but superior fracture toughness resulted from the different fracture mechanisms of these two types' tests. In tensile specimens, the final fracture happened at a section that was most heavily damaged by the accumulation of large interlamellar microcracks and arbitrarily located within the gauge-limited volume. In 3PB notch specimens, the propagation of the main crack was constrained within a narrow strip nearby the centerline where the normal stress was the highest. Large lamellar grains caused serious damage in tensile tested specimens. However multi-oriented large lamellar grains formed seriously bifurcated crack tips, which made the crack propagation more difficult in 3PB notched specimen. The main mechanisms of toughening in FL specimens were the deflection of main crack, bifurcation and blunting of crack tip and formation of a diffuse zone of microcracks. These phenomena reduced the driving force for crack extending and then increased the fracture toughness.
会议录	2006 BIMW: 2006 BEIJING INTERNATIONAL MATERIALS WEEK, PTS 1-4
会议录出版者	TRANS TECH PUBLICATIONS LTD
会议录出版地	KREUZSTRASSE 10, 8635 DURNTEN-ZURICH, SWITZERLAND
语种	英语
资助项目	National Nature Science Foundation of China[50471109]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000246145502048
内容类型	会议论文
源URL	[http://119.78.100.223/handle/2XXMBERH/38203]
专题	材料科学与工程学院
通讯作者	Cao, R.
作者单位	1.Lanzhou Univ Technol, State Key Adv Non Ferrous Met Mat, Lanzhou 730050, Peoples R China 2.Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Cao, R.,Chen, J. H.,Zhang, J.. Study on fracture behavior of gamma-TiAl based alloys[C]. 见:.