摘要
铁基形状记忆合金由于价格低廉、强度高、加工性能好、可焊接等优点引起广泛重视。机械合金化(MA)和粉末冶金(PM)作为制备材料的新工艺,可以用来制备性能优越的形状记忆合金。本文详述了机械合金化和粉末冶金工艺在制备Fe-Mn-Si基形状记忆合金过程中对合金相变、组织与性能的影响,以及此类合金在新领域的应用。最后提出了现阶段在研究MA/PM工艺制备Fe-Mn-Si基SMA中有关工艺参数、相变机制以及回复应力和低温应力松弛所存在的问题。
Iron-based shape memory alloys have recently attracted widespread attention due to their low cost, excellent workability,machinability and good weldability, and has been identified as a new shape memory material with promising development. Mechanical alloying(MA) and powder metallurgy(PM) are new methods for the preparation of materials, which can be used to prepare shape memory alloy with superior properties. The effect of MA and PM on the phase transformation, microstructure and properties of Fe-Mn-Si-based shape memory alloys, and the application of such alloys in new fields were discussed in details. At last, the problems in the study of MA/PM process for preparing Fe-Mn-Si based SMA, such as process parameters, phase transformation mechanism, recovery stress and low temperature stress relaxation are pointed aod.
引文
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