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Bending fatigue behavior of thin Zr61Ti2Cu25Al12 bulk metallic glass beams for compliant mechanisms application
Li, Diao-Feng1,2; Yang, Ya-Long1,2; Shen, Yong1; Xu, Jian1
Corresponding AuthorXu, Jian(jianxu@imr.ac.cn)
2021-10-30
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume89Pages:1-15
AbstractIn 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.
KeywordMetallic glasses Bending fatigue Crack initiation Crack propagation Compliant mechanisms
Funding OrganizationNational Natural Science Foun-dation of China
DOI10.1016/j.jmst.2021.02.015
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foun-dation of China[51571192]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000696986000001
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/167026
Collection中国科学院金属研究所
Corresponding AuthorXu, Jian
Affiliation1.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
Recommended Citation
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.
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