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
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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. |
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