Fe-Mn-Si形状记忆合金低温松弛机理  

MECHANISM OF LOW-TEMPERATURE RELAXATION OF Fe-Mn-Si BASED SHAPE MEMORY ALLOY

作　　者：林成新[1] 谷南驹[1] 温春生[1] 刘庆锁[2] 赵连城[3] 

机构地区：[1]河北工业大学材料科学与工程学院,天津300130 [2]天津理工学院材料科学与工程系,天津300191 [3]哈尔滨工业大学材料科学与工程学院,哈尔滨150001

出　　处：《金属学报》2002年第8期825-828,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目 59801005

摘　　要：采用X射线衍射、透射电镜以及恢复力测量,研究了Fe-17Mn-5Si-10Cr-5Ni合金的低温松弛性能.结果表明,实验合金的低温松弛十分严重,恢复力在-60℃时较室温下松弛了57.17％.低温松弛后实验合金组织中存在较多的ε和α＇马氏体,这些ε和α＇马氏体主要是由应力诱发产生的.温度降低相变驱动力增大,在恢复力的作用下发生应力诱发ε和α＇马氏体相变是导致Fe-Mn-Si合金低温松弛的根本原因,诱发的ε和α＇马氏体量越多,松弛程度就越高.Characteristics of low-temperature relaxation of Fe-17Mn-5Si-10Cr-5Ni alloy have been studied by means of XRD, TEM and measurement of recovery stress. Results show that the low-temperature relaxation in the alloy was so serious that the relaxation ratio for recovery stress reached to 57.17% after cooling from room temperature to -60℃. There were moreεand α'martensites in the alloy after low-temperature relaxation, and theseεand α' martensites were mainly produced by recovery stress. With increase of phase transformation driving force by decreasing temperature, the stress-induced εand α' martensitic transformations will occur under the recovery stress in Fe-Mn-Si based alloy, which is the essential causes for low-temperature relaxation. The more serious relaxation is in accordance with the more amount of the stress inducedεandα'martensites.

关 键 词：形状记忆合金 FE-MN-SI合金 低温松池 应力诱发马氏体相应 

分 类 号：TG139.6[一般工业技术—材料科学与工程]