Strain Hardening Behavior During Multistep Nanoindentation of FeSiB Amorphous Alloy
The intention of the present study is to investigate the mechanical properties of the Fe80.75Si8B11.25 amorphous alloys produced by melt-spinning process by the means of nanoindentation method.Two types of instrumented nanoindentation were conducted on the specimen:(1)singlestep nanoindentation(loading-unloading)and,(2)multistep nanoindentation(incremental loading-unloading).The strain hardening behavior was observed during multistep nanoindentation of Fe80.75Si8B11.25 amorphous alloys which is quite uncommon in metallic glasses.It was found that multistep nanoindentation(incremental loading-unloading)increased the hardness value up to 20%when compared to singlestep nanoindentation(loading-unloading).This matter shows a unique strain hardening behavior in Fe-based amorphous alloys that can be attributed to the arrestment and entanglement of the propagating shear bands during incremental loading-unloading process.In addition,atomic force microscopy(AFM)of the indented surfaces revealed that surface steps around the indent in amorphous alloy being as a result of the shear band activation had extended to a lesser extent to the surface after multistep nanoindentation when compared to singlestep one.In other words,the amount of material pile-up was higher in multistep nanoindentation as compared to single step one.This matter exhibits further strain localization around the indent after incremental loading-unloading process,leading to the interaction and arrestment of the shear bands during reactivation at the same location.
Fe-based amorphous alloys strain hardening nanoindentation shear bands
Lashgari H.R. Cadogen J.M. Chu D. Li S.
The School of Materials Science and Engineering,University of New South Wales,Sydney,Australia School of Physical,Environmental and Mathematical Sciences,UNSW Canberra at the Australian Defence F
国内会议
上海
英文
1-5
2015-10-21（万方平台首次上网日期，不代表论文的发表时间）