Toughening Mechanisms of Lamellar TiAl Alloys Containing B2 Phase at Room Temperature

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	Toughening Mechanisms of Lamellar TiAl Alloys Containing B2 Phase at Room Temperature
	Wang Zhe 1,3; Cao Rui 1,3; Chen Jianhong 1,3; Zhang Ji 2
刊名	RARE METAL MATERIALS AND ENGINEERING
	2014-03
卷号	43 期号:3 页码:540-543
关键词	TiAl alloys toughening mechanisms fracture toughness B2 phase
ISSN号	1002-185X
英文摘要	Three point bending (3PB) fracture tests and unload tests of lamellar TiAl alloys containing B2 phase were carried out to investigate the toughening mechanisms of the TiAl alloy. Double notched 4PB tests were used to evaluate the critical event of cleavage fracture of this alloy. To observe the morphology of fracture surface and crack path, scantling electron microscope (SEM) and energy spectrum analyses were also carried out. The results reveal the following aspects: (1) The load-displacement curve of 3PB fracture tests presents linear elastic relationship, and B2 phase has no effect on the crack initiation. (2) B2 phase is an obstacle to the crack propagation. The crack is arrested by B2 phase at low applied load and bypasses the B2 phase by skipping over B2 phase or crosses B2 phase at high applied load. (3) The critical event of the cleavage fracture of a notched specimen is a propagation of the nucleated interlamellar crack at the notch root. And trans-lamellar propagation is the key factor affecting the whole process of cleavage fracture. (4) The toughening mechanisms of the current alloy include B2 phase toughening, crack deflection, shear ligament toughening and trans-lamellar toughening.
资助项目	National Natural Science Foundation of China[51265028] ; National Natural Science Foundation of China[50905081]
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:000333879500006
状态	已发表
内容类型	期刊论文
源URL	[http://119.78.100.223/handle/2XXMBERH/34443]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
通讯作者	Cao Rui
作者单位	1.Lanzhou Univ Technol, Coll Mat Sci & Engn, Lanzhou 730050, Peoples R China 2.Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China 3.Lanzhou Univ Technol, State Key Lab Gansu Adv Nonferrous Met Mat, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Wang Zhe,Cao Rui,Chen Jianhong,et al. Toughening Mechanisms of Lamellar TiAl Alloys Containing B2 Phase at Room Temperature[J]. RARE METAL MATERIALS AND ENGINEERING,2014,43(3):540-543.
APA	Wang Zhe,Cao Rui,Chen Jianhong,&Zhang Ji.(2014).Toughening Mechanisms of Lamellar TiAl Alloys Containing B2 Phase at Room Temperature.RARE METAL MATERIALS AND ENGINEERING,43(3),540-543.
MLA	Wang Zhe,et al."Toughening Mechanisms of Lamellar TiAl Alloys Containing B2 Phase at Room Temperature".RARE METAL MATERIALS AND ENGINEERING 43.3(2014):540-543.