材料期刊网

Effect of carbon, compound RE, quenching temperature, pre-strain and recovery tem-perature on shape memory effect (SME) of Fe-Mn-Si-Ni-C-RE shape memory alloy was studied by bent measurement, thermal cycle training, SEM etc. It was shown that the grains of alloys addition with compound RE became finer and SME increased evidently. SME of the alloy was weakening gradually as carbon content increased under small strain (3). But in the condition of large strain (more than 6), SME of the alloy whose carbon content range from 0.1to 0.12 howed small decreasing range, especially of alloy with the addition of compound RE. Results were also indicated that SME was improved by increasing quenching temperature (>1000℃): The amount of thermal induced martensite increased and the relative shape recovery ratio could be increased to more than 40after 3-4 times thermal training. The relative shape recovery ratio decreased evidently depending on rising of pre-strain. Furthermore, because speed of martensite transition was extremely great under higher tempering temperature (more than 450℃), ε→γ transition completed in 10s meanwhile the relative shave recovery ratio of the allou increased rapidly.