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Published on: January 26, 2016
Testing Effects on Shear Transformation Zone Size of Metallic Glassy Films Under Nanoindentation
Yi Ma1, Yuxuan Song2, Xianwei Huang3
1College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China. may@zjut.edu.cn.
Abstract:
Room-temperature creep tests are performed at the plastic regions of two different metallic glassy films under Berkovich nanoindetation. Relying on the strain rate sensitivity of the steady-state creep curve, shear transformation zone (STZ) size is estimated based on the cooperative shear model (CSM). By applying various indentation depths, loading rates, and holding times, the testing effects on the STZ size of metallic glasses are systematically studied. Experimental results indicate that STZ size is greatly increased with increased indentation depth and shortened holding time. Meanwhile, STZ size is weakly dependent on the loading history. Both the intrinsic and extrinsic reasons are discussed, to reveal the testing effects on the nanoindentation creep flow and STZ size.
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