Fracture process and fracture mechanism in fully lamellar TiAl alloys with tensile tests

doi:10.3901/JME.2008.01.040

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	Fracture process and fracture mechanism in fully lamellar TiAl alloys with tensile tests
	Cao, Rui 2; Lin, Youzhi 3; Chen, Jianhong 2; Hu, D.1
刊名	Jixie Gongcheng Xuebao/Chinese Journal of Mechanical Engineering
	2008
卷号	44 期号:1 页码:40-45
关键词	Aluminum alloys Fracture Intermetallics Scanning electron microscopy Tensile testing Fracture mechanism In-situ tensile TiAl-based alloys
ISSN号	05776686
DOI	10.3901/JME.2008.01.040
英文摘要	By means of in-situ tensile tests of fully lamellar TiAl based alloys, the analysis of experiment data, scanning electron microscope (SEM) S-520 observation of fracture surface, the tensile fracture process and fracture mechanism of TiAl alloys are investigated. The result of in-situ tensile experiment reveals that cracks are initiated directly from the notch root for the straight notch specimens, and the fracture mechanism is that the main crack is initiated, propagated and connected, when the main crack extends to a length, which acts as a Griffiths crack and matches the loading stress which the crack propagates catastrophically through entire specimen. Cracks initiate at interfaces between lamellae and lamellar interface is the most weakest part. Fracture surface is composed of the trans-lamellar fracture and inter-lamellar fracture, trans-lamellar fracture is dominant. For flat in-situ tensile specimen or those with a big circle arc gauge at a higher applied load, a number of large cracks are produced along lamellar interfaces within the gauge-limited volume of tensile specimens. With increasing applied load, microcracks propagate and connect, the final crack develops at a most heavily damaged section within the gauge-limited volume by passing through the remaining ligaments among the interlamellar cracks. For most specimens, fracture process is the crack direct initiation process. Once a crack is produced, the specimen will fracture. It is also to say the strength of the material is very higher, and crack initiation and damage are more difficult.
语种	中文
出版者	Editorial Office of Chinese Journal of Mechanical, 22 Baiwanzhuang Dajie, Beijing, 100037, China
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112204]
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
作者单位	1.Interdisciplinary Research Centre, University of Birmingham, Birmingham, B15 2TT, United Kingdom 2.State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China; 3.Ningde Vocational and Technical College, Fuan 355000, China;
推荐引用方式 GB/T 7714	Cao, Rui,Lin, Youzhi,Chen, Jianhong,et al. Fracture process and fracture mechanism in fully lamellar TiAl alloys with tensile tests[J]. Jixie Gongcheng Xuebao/Chinese Journal of Mechanical Engineering,2008,44(1):40-45.
APA	Cao, Rui,Lin, Youzhi,Chen, Jianhong,&Hu, D..(2008).Fracture process and fracture mechanism in fully lamellar TiAl alloys with tensile tests.Jixie Gongcheng Xuebao/Chinese Journal of Mechanical Engineering,44(1),40-45.
MLA	Cao, Rui,et al."Fracture process and fracture mechanism in fully lamellar TiAl alloys with tensile tests".Jixie Gongcheng Xuebao/Chinese Journal of Mechanical Engineering 44.1(2008):40-45.