Ni-W合金原位拉伸形变的电子背散射衍射分析

In-situ tensile deformation of Ni-W alloys analyzed by electron backscatter diffraction

采用配置在场发射扫描电镜中的电子背散射衍射仪和应变微拉伸仪,统计分析了Ni-W合金在原位单轴拉伸变形过程中,显微结构、晶界分布、晶粒转动及晶体学取向的变化。在形变(ε=22%)过程中,Ni-9%W合金中的大量晶粒转动,产生滑移,并分为亚晶。应变使大角度晶界的含量增加,挛晶界明显减小,晶粒转动量达15°。立方织构(001)[100]随拉伸形变量的增加而减小。

The thermal field emission SEM equipped with an electron backscatter diffraction tester and a strain micro-tester was used to statistic analyzing variations in microstructure, grain boundary distribution, lattice orientation rotation and grain orientation of Ni-W alloys during in-situ process of uniaxial tensile deformation. A large number of grains in Ni-9 % W alfoy rotate during deformation process （ε= 22 % ） are divided into sub-grains due to the multiple slip. Because of the strain, the amounts of the high angle boundary increases, the twin boundary remarkable decreases and the lattice orientation increase of 15° in the Ni-9% W alloy. The cubic texture of （001） [ 100] decreases with the increase in the tensile deformation.