Authors: Vinay Sriram JennMing Yang Jia Ye Andrew M Minor
Publish Date: 2008/10/18
Volume: 60, Issue: 9, Pages: 66-70
Abstract
Deformation twinning in nanocrystalline and ultrafinegrained materials has attracted much attention in recent years due to the ability of a high density of twin boundaries to dramatically improve mechanical properties such as yield strength and ductility Various processing conditions such as ball milling cryomilling electrodeposition and equichannel angular extrusion have been used to form deformation twins in metals Most techniques for estimating the shear stress needed to form deformation twins are based indirectly on the processing conditions Here a new method to directly measure the shear stress needed to form twin boundaries through insitu transmission electron microscopy nanocompression testing will be described
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