Deformation Behavior of Mg-Nd Alloy at Room Temperature and Cryogenic Temperature
The compression deformation behavior of as-annealed Mg-Nd alloy sheet along rolling direction at room temperature(RT)and cryogenic temperature(CT)of-150 ℃ was investigated by in-situ electron backscattered diffraction(EBSD),slip trace method and in-grain misorientation axes(IGMA)method.The results show that the twinning mode is not affected by deformation temperature.In contrast,the twinning nucleation rate and slip type are dramatically affected.Compared with RT compression,the local stress is obviously increased in the sample under CT compression.As a result,the twinning nucleation rate and total length of twin boundary are increased by about 10％and 8％,respectively,at CT under the same compression deformation strain(4％).In the meantime,non-basal slips are promoted during CT compression deformation with the proportion increasing from 45.5％at RT to 65.9％at CT.In addition,the low temperature inhibits basal<a>slip during compression deformation,and the proportion of basal<a>slip is decreased from 54.5％at RT to 34.1％at CT.
NETL
NSTL
万方数据
