TEM STUDY ON DEFORMATION MICROSTRUCTURE IN A Fe-Mn-Si-Cr-Ni SHAPE MEMORY ALLOY
RONG Lijian; (Institute of Meial Research; Chinese Academy of Sciences; Shenyang 110015) PING Dehai; LI Yiyi; SHI Changxu (Lab of Atomic Imaging of Solids; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)
Cite this article:
RONG Lijian; (Institute of Meial Research; Chinese Academy of Sciences; Shenyang 110015) PING Dehai; LI Yiyi; SHI Changxu (Lab of Atomic Imaging of Solids; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015). TEM STUDY ON DEFORMATION MICROSTRUCTURE IN A Fe-Mn-Si-Cr-Ni SHAPE MEMORY ALLOY. Acta Metall Sin, 1995, 31(9): 399-404.
Abstract Effects of elements Cr and Ni on the c/a ratio and stress-induced ε martensite microstructure in Fe-Mn-Si alloy have been investigated, by using X-ray and analytic electron microscope. The results show that by addition of Cr and Ni, c/a ratio in Fe-Mn-Si alloy has been increased from 1.620 to 1.656 and this is favourable to the formation of fec deformation twin. The penetration process of ε martensites on different {111}plane can be avoided through the formation of ε martensite in fcc twin, which is responsible for the better shape memory effect in Fe-Mn-Si-Cr-Ni alloy.