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NiTi合金具有形状记忆效应,这一效应是与在～0℃以上发生的由B_2相(b.c.c.)→M相(b.c.t.)的马氏体相变有关的.在M_s点以上,曾发现电阻、X射线和电子衍射及内耗的反常,对这些被称为予马氏体效应的反常现象曾有多种解释,其中之一是Clapp的软模理论.他认为马氏体相变是由母相点阵中一些特殊区域(如缺陷)被应变导致的弹性不稳定性
NiTi alloys have a shape memory effect that is related to the martensitic transformation from the B 2 phase to the M phase (bct) occurring above 0 ° C. Above the M_s point, it was found that the resistance, X Ray and electron diffraction and internal friction anomalies have many explanations for these anomalies known as pre-martensite effects, one of which is the soft-theory of Clapp. He believes that the martensitic transformation consists of a mother-of- The array of some special areas (such as defects) is caused by the elastic instability