作　　者： ; ; (季之强）; (金嘉陵）;

机构地区： 上海钢铁研究所

出　　处： 《钢铁研究学报》 1991年第3期43-48,共6页

摘　　要： 本文采用X衍射、透射电镜、拉伸、动态扫描电镜等实验方法,研究了Fe-29.5％Mn和5.8％Si合金的相变和形状记忆效应。结果表明,合金在室温为单-Y相,在应力作用下会发生Y-ε马氏体相变。应力诱导的ε马氏体呈细条状,平行排列。若应变值在2.5％以内,合金的形状记忆回复率可达95％以上;当应变值超过2.5％时,合金的形状记忆回复率逐渐降低。研究表明,上述形状记忆特性是由应力协助形核和应变诱导形核两种不同机制决定的。 The phase transformation and shape memory effect in Fe-29.5%Mn-5.8%Si have been studied by means of X-ray diffraction, TEM, tensile tests and SEM with tension attachment. It was shown that the original structure of specimen was single γ phase and the γ→ε martensitic transformation took place by external stress. The micrograph of stress-induced γ mar-tensite is sheet like and parallel arranged. The specimen exhibits nearly complete shape memory effect when strain is lower than 2.5% but the shape memory recovery is gradually decreased if the strain exceeds this limit. The above characteristics are related to the different mechanisms of stress-assisted and strain-induced nucleations.

关 键 词： 铁锰硅合金 相变 形状记忆效应

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]