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

doi:10.1557/jmr.2011.210

IMR OpenIR

	Weibull analysis of fracture strength for Zr55Ti2Co28Al15 bulk metallic glass: Tension-compression asymmetry and porosity effect
	Gao, Hui-Li; Shen, Yong; Xu, Jian
通讯作者	Xu, Jian(jianxu@imr.ac.cn)
	2011-08-01
发表期刊	JOURNAL OF MATERIALS RESEARCH
ISSN	0884-2914
卷号	26 期号:16 页码:2087-2097
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.
资助者	National Natural Science Foundation of China ; National Basic Research Program of China (973 Program)
DOI	10.1557/jmr.2011.210
收录类别	SCI
语种	英语
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
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:000296082300010
出版者	CAMBRIDGE UNIV PRESS
引用统计	被引频次：27[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/105087
专题	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.