Bending fatigue behavior of thin Zr61Ti2Cu25Al12 bulk metallic glass beams for compliant mechanisms application

doi:10.1016/j.jmst.2021.02.015

CORC > 金属研究所 > 中国科学院金属研究所

	Bending fatigue behavior of thin Zr61Ti2Cu25Al12 bulk metallic glass beams for compliant mechanisms application
	Li, Diao-Feng 1,2; Yang, Ya-Long 1,2; Shen, Yong 1; Xu, Jian 1
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2021-10-30
卷号	89 页码:1-15
关键词	Metallic glasses Bending fatigue Crack initiation Crack propagation Compliant mechanisms
ISSN号	1005-0302
DOI	10.1016/j.jmst.2021.02.015
通讯作者	Xu, Jian(jianxu@imr.ac.cn)
英文摘要	In this work, bending fatigue behavior of thinner Zr61Ti2Cu25Al12 (ZT1) BMG beams with thicknesses of 500 mu m and 100 mu m were investigated with three-point bending (3PB), to evaluate the reliability and safety of this potentially material used in compliant mechanisms under cyclic bending load. Fatigue endurance limits (FELs) of ZT1 beams with thicknesses of 500 mu m and 100 mu m were determined to be 470 MPa, and similar to 0.3 of its tensile strength. Fatigue life and FEL of ZT1 beams in bending are substantially independent of the beam thickness, in the scale from 500 mu m down to 100 mu m. Fatigue cracks of all ZT1 beams initiated at the extrinsic microvoids, either indirectly derived from surface scratches during mechanical polishing or originated from as-cast process. However, fatigue crack propagation behavior is highly related to the magnitude of cyclic stress level. By interrupted fatigue tests, larger proportion about 60-70% of fatigue life was spent on crack propagation under high stress level, while crack initiation occupied larger proportion about 80-85% under low stress level. The medium stress level of about 590 MPa almost shared the crack-initiation life and crack-propagation life. In addition, there are two crack deflection mechanisms during cracks steady propagation stage. One mechanism is crack deflection along the interacted shear bands ahead of crack-tip, the other one is crack "jump" from one shear band to another shear band at a certain angle. These two mechanisms alternate dominate the crack propagation process, generating typical staircase-like crack propagation trajectory. Fatigue endurance limits of ZT1 beams in the form of either stress amplitude or strain amplitude are superior to traditional candidate materials in the field of compliant mechanisms, showing that the better reliability and larger deflection deformation can be achieved for flexible members made by ZT1 BMG even under cyclic loading. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
资助项目	National Natural Science Foun-dation of China[51571192]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000696986000001
资助机构	National Natural Science Foun-dation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/167025]
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	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Li, Diao-Feng,Yang, Ya-Long,Shen, Yong,et al. Bending fatigue behavior of thin Zr61Ti2Cu25Al12 bulk metallic glass beams for compliant mechanisms application[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,89:1-15.
APA	Li, Diao-Feng,Yang, Ya-Long,Shen, Yong,&Xu, Jian.(2021).Bending fatigue behavior of thin Zr61Ti2Cu25Al12 bulk metallic glass beams for compliant mechanisms application.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,89,1-15.
MLA	Li, Diao-Feng,et al."Bending fatigue behavior of thin Zr61Ti2Cu25Al12 bulk metallic glass beams for compliant mechanisms application".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 89(2021):1-15.