In situ SEM indentation of a Zr-based bulk metallic glass at elevated temperatures

被引：34
|
作者：
Wheeler, J. M. [1 ]
Raghavan, R. [1 ]
Michler, J. [1 ]
机构：
[1] EMPA Swiss Fed Labs Mat Sci & Technol, Lab Mech Mat & Nanostruct, CH-3602 Thun, Switzerland
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 29-30期
关键词：
Electron microscopy; Nanoindentation; Bulk amorphous alloys; Shear bands; INSTRUMENTED INDENTATION; PRESSURE SENSITIVITY; PLASTIC-DEFORMATION; SERRATED FLOW; AMORPHOUS METALS; NANOINDENTATION; BEHAVIOR; DEPENDENCE;
D O I：
10.1016/j.msea.2011.08.057
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The elevated temperature indentation response of a Zr-based bulk metallic glass (BMG) was examined using a novel in situ SEM indentation system modified with tip and sample heating. Hardness was found to linearly increase with temperature from 7 GPa at 25 degrees C to 7.6 GPa at 200 degrees C, while the modulus remained constant within measurement accuracy. Adhesion between indenter and the BMG was observed to increase with increasing temperature. Both the number and pointed morphology of the surface shear offset displacements were found to decrease with increasing temperature. Conversely, the magnitude of the load drops/serrations in the load displacement curve was found to increase dramatically with temperature. The transitions from smooth to serrated flow were observed to fall within the temperature-strain rate ranges observed by other researchers in uniaxial compression. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：8750 / 8756
页数：7
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