Abstract
The shape memory effect (SME) of Fe-15Mn-5Si-9Cr-5Ni-(0.5–1.5)NbC alloys pre-extended at room temperature was investigated. It shows that the pre-deformation result is similar for the SME of three composition alloys, i.e., the SME increased with increasing pre-extension and then decreased when they were over 12–14% pre-extended at room temperature. X-ray diffraction showed that there are two kinds of martensite transformations � (fcc) ! (hcp) and � ! ! � 0 (bcc) occurring in the Fe-15Mn-5Si-9Cr-5Ni-(0.5–1.5)NbC alloys when the alloys were deformed at room temperature. It was found by magnetic saturation measurements that when the alloy was 8% extended at room temperature, � 0 phase appeared and obviously increased with increasing deformation. Furthermore, TEM observations showed that � 0 phase exists in the cross section of the martensite and reverses in the different path of � ! . The effect of pre-deformation and aging on SME was correspondingly explained in view of martensite transformations and its nucleation, i.e., stacking faults and associated contribution of NbC precipitation, for � ! transformation. [doi:10.2320/matertrans.47.1328]
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