Weibull analysis of fracture strength for Zr55Ti2Co28Al15 bulk metallic glass: Tension-compression asymmetry and porosity effect

doi:10.1557/jmr.2011.210

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	Weibull analysis of fracture strength for Zr55Ti2Co28Al15 bulk metallic glass: Tension-compression asymmetry and porosity effect
	Gao, Hui-Li; Shen, Yong; Xu, Jian
刊名	JOURNAL OF MATERIALS RESEARCH
	2011-08-01
卷号	26 期号:16 页码:2087-2097
ISSN号	0884-2914
DOI	10.1557/jmr.2011.210
通讯作者	Xu, Jian(jianxu@imr.ac.cn)
英文摘要	In this work, two-and three-parameter Weibull statistics were used for analyzing the variability of fracture strength for Zr55Ti2Co28Al15 bulk metallic glass (BMG), both in compression and in tension testing. In contrast to the compression in which the specimens fail via the massive shear-off, however, failure mode in tension for the as-cast BMG is flaw-controlled crack opening (mode I or mixed mode) due to the presence of cast defects such as porosity. As a result, dispersion of compressive fracture strength is rather uniform. For the BMG rods of 6 mm in diameter, the three-parameter Weibull modulus m(3p) and threshold stress sigma(mu) (below which no failure occurs) are 3.4 and 1780 MPa, respectively. However, tensile fracture strength of the BMGs manifests a large variability, in a range of 310-1690 MPa. In terms of fracture surface morphology, the specimen failure at different stress is associated with two types of defects: large pores on/near the surface of specimens and small internal pores. Using bimodal and three-parameter Weibull analysis, the Weibull modulus m(1) and threshold sigma(mu 1) at lower strength level are 1.8 and 250 MPa, respectively, suggesting a modest reliability. One should exercise caution, therefore, in interpreting the reliability of as-cast BMG materials only simply in terms of the compression tests, small-sized samples, and tow-parameter Weibull analysis. Like the conventional metal castings, controlling the processing conditions to minimize the cast defects is critical issue to ensure the reliability of BMG materials.
资助项目	National Natural Science Foundation of China[50871112] ; National Basic Research Program of China (973 Program)[2007CB613906]
WOS研究方向	Materials Science
语种	英语
出版者	CAMBRIDGE UNIV PRESS
WOS记录号	WOS:000296082300010
资助机构	National Natural Science Foundation of China ; National Basic Research Program of China (973 Program)
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/105086]
专题	金属研究所_中国科学院金属研究所
通讯作者	Xu, Jian
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Gao, Hui-Li,Shen, Yong,Xu, Jian. Weibull analysis of fracture strength for Zr55Ti2Co28Al15 bulk metallic glass: Tension-compression asymmetry and porosity effect[J]. JOURNAL OF MATERIALS RESEARCH,2011,26(16):2087-2097.
APA	Gao, Hui-Li,Shen, Yong,&Xu, Jian.(2011).Weibull analysis of fracture strength for Zr55Ti2Co28Al15 bulk metallic glass: Tension-compression asymmetry and porosity effect.JOURNAL OF MATERIALS RESEARCH,26(16),2087-2097.
MLA	Gao, Hui-Li,et al."Weibull analysis of fracture strength for Zr55Ti2Co28Al15 bulk metallic glass: Tension-compression asymmetry and porosity effect".JOURNAL OF MATERIALS RESEARCH 26.16(2011):2087-2097.