On the fracture toughness of bulk metallic glasses under Berkovich nanoindentation

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	On the fracture toughness of bulk metallic glasses under Berkovich nanoindentation
	Guo, H; Jiang, CB; Yang, BJ; Wang, JQ; Wang, JQ (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
刊名	JOURNAL OF NON-CRYSTALLINE SOLIDS
	2018-02-01
卷号	481 页码:321-328
关键词	Elastic-plastic Indentation Fatigue-crack-propagation Instrumented Indentation Mechanical-properties Vickers Indentation Damage Mechanics Ductile Fracture Shear-band Model Initiation
ISSN号	0022-3093
英文摘要	Measurements of fracture toughness from the crack tip opening displacement (CTOD) testing methods are complex and paramount important for a range of bulk metallic glasses (BMGs). In this work, we attempted to propose an indentation protocol to evaluate indentation fracture toughness based on two key considerations: First, the plastic deformation induced damage to the characteristic fracture initiation point calculated from integrating the indentation load-displacement curves is obtained and used to estimate indentation fracture toughness. Second, the continuum damage mechanics theory has been adopted to identify the characteristic fracture initiation point. To verify the applicability of the suggested approach, fracture toughness values of BMGs were estimated and compared with those from CTOD tests in the literature. The estimated fracture toughness values Kc obtained from the indentation tests agreed well with those K-Q from the CTOD tests within an approximately relative difference of 10%. We also found that K9 linearly correlates with K-C (K-Q = 1.1K(C) - 3.7). The value of K-Q in Al-based BMG is predicted to be similar to 35 MPa root m.; Measurements of fracture toughness from the crack tip opening displacement (CTOD) testing methods are complex and paramount important for a range of bulk metallic glasses (BMGs). In this work, we attempted to propose an indentation protocol to evaluate indentation fracture toughness based on two key considerations: First, the plastic deformation induced damage to the characteristic fracture initiation point calculated from integrating the indentation load-displacement curves is obtained and used to estimate indentation fracture toughness. Second, the continuum damage mechanics theory has been adopted to identify the characteristic fracture initiation point. To verify the applicability of the suggested approach, fracture toughness values of BMGs were estimated and compared with those from CTOD tests in the literature. The estimated fracture toughness values Kc obtained from the indentation tests agreed well with those K-Q from the CTOD tests within an approximately relative difference of 10%. We also found that K9 linearly correlates with K-C (K-Q = 1.1K(C) - 3.7). The value of K-Q in Al-based BMG is predicted to be similar to 35 MPa root m.
学科主题	Materials Science, Ceramics ; Materials Science, Multidisciplinary
语种	英语
资助机构	National Key Research and Development Program of China [2016YFB1100204]; National Natural Science Foundation of China [51131006, 51471166]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79547]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, JQ (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Guo, H,Jiang, CB,Yang, BJ,et al. On the fracture toughness of bulk metallic glasses under Berkovich nanoindentation[J]. JOURNAL OF NON-CRYSTALLINE SOLIDS,2018,481:321-328.
APA	Guo, H,Jiang, CB,Yang, BJ,Wang, JQ,&Wang, JQ .(2018).On the fracture toughness of bulk metallic glasses under Berkovich nanoindentation.JOURNAL OF NON-CRYSTALLINE SOLIDS,481,321-328.
MLA	Guo, H,et al."On the fracture toughness of bulk metallic glasses under Berkovich nanoindentation".JOURNAL OF NON-CRYSTALLINE SOLIDS 481(2018):321-328.