Abstract
We investigate microstructures and recovery behavior of trained Fe14Mn5Si8Cr4Ni and Fe14Mn5Si8Cr4Ni0.12C alloys under different deformation strains by color optical micrographs, XRD, and SQUID. The training results in the formation of α′ martensite in Fe14Mn5Si8Cr4Ni alloy, while introduces Cr23C6 particles besides the α′ martensite in Fe14Mn5Si8Cr4Ni0.12C alloy. The stress‐induced ε martensite bands are thinner in trained Fe14Mn5Si8Cr4Ni0.12C alloy than in trained Fe14Mn5Si8Cr4Ni alloy. When the deformation strain is below 8%, the recovery strain of trained Fe14Mn5Si8Cr4Ni0.12C alloy is slightly lower than that of trained Fe14Mn5Si8Cr4Ni alloy. This result is attributed to the fact that the Ms temperature of Fe14Mn5Si8Cr4Ni0.12C alloy is much below the deformation temperature than that of Fe14Mn5Si8Cr4Ni alloy. When the deformation strain is above 8%, the recovery strain of trained Fe14Mn5Si8Cr4Ni0.12C alloy is higher than that of trained Fe14Mn5Si8Cr4Ni alloy. The reason for this result is that in trained Fe14Mn5Si8Cr4Ni0.12C alloy, both α′ martensite and Cr23C6 particles prevent stress‐induced ε martensite bands from colliding each other at large deformation strain, and the width of stress‐induced ε martensite bands is smaller as compared with trained Fe14Mn5Si8Cr4Ni alloy. It is concluded that carbon addition can improve the recovery strain of trained FeMnSi based shape memory alloys at large deformation strain.
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