Direct observations on the evolution of shear bands into cracks in metallic glass

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	Direct observations on the evolution of shear bands into cracks in metallic glass
	R. T. Qu ; F. F. Wu ; Z. F. Zhang ; J. Eckert
刊名	Journal of Materials Research
	2009
卷号	24 期号:10 页码:3130-3135
关键词	tensile ductility matrix composites deformation fracture plasticity behavior
ISSN号	0884-2914
中文摘要	The evolution of shear bands (SBs) into cracks was observed by using a high-resolution scanning electron microscope in Zr(59)Cu(20)Al(10)Ni(8)Ti(3) metallic glassy samples after a small punch test with different strain rates. As shear strain increased along a radial SB, three distinctive regions of morphologies were found (I) bonded SB, (II) microcrack plus bonded SB, and (III) full crack. In region H with moderate shear strain, some glassy "extrusions" were also observed. Once shear offset increases to a critical value, the SB becomes a full crack. For two different SBs in one specimen, the critical shear offsets maintain approximately the same value, which sheds light on the critical shear failure condition of metallic glass. The critical shear offset was also found to be sensitive to the strain rate and a higher strain rate led to less critical shear offset. It is suggested that the structure evolution and heat evolution within a shearing SB should be responsible for the present results.
原文出处	://WOS:000270500100018
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/32251]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	R. T. Qu,F. F. Wu,Z. F. Zhang,et al. Direct observations on the evolution of shear bands into cracks in metallic glass[J]. Journal of Materials Research,2009,24(10):3130-3135.
APA	R. T. Qu,F. F. Wu,Z. F. Zhang,&J. Eckert.(2009).Direct observations on the evolution of shear bands into cracks in metallic glass.Journal of Materials Research,24(10),3130-3135.
MLA	R. T. Qu,et al."Direct observations on the evolution of shear bands into cracks in metallic glass".Journal of Materials Research 24.10(2009):3130-3135.