【作者】 沈红节；

【导师】 徐根应； 陈九磅；

【作者基本信息】 合肥工业大学 ， 材料学， 2004， 硕士

【摘要】 本文在以前研究的基础上，通过挑选两种比较有特点的热处理工艺，并结合不同的变形量，借助于金相观察、SEM、MTS、冲击拉伸等试验手段，研究了Cu-10Al-6Mn-4Zn-0.3Zr(wt％)合金中应力诱发马氏体的变化过程及不同应变率下其应力—应变曲线特征，发现： 应力诱发马氏体受合金的组织特点影响较大，当母相中的β相呈条状并处于α相包围时极易引起应力诱发马氏体并表现出“浮凸”和马氏体互相“吞噬”的特征，而当母相由单一的β相组成时一般观察不到“浮凸”的特征，只是在极个别的β相中的个别部位由于位移松弛而表现出“浮凸”的特征；合金的应力一应变曲线受组织、应变速率影响较大，其随应变速率的变化呈现出互相交叉的现象；此外，合金的形状记忆回复率与变形量之间也存在一定的对应关系，对于弯曲变形当弯曲毛坯外表面上切向应变值达到马氏体屈服点所对应的应变值时其记忆回复率最大。更多还原

【Abstract】 On the base of the previous study of Cu-based shape memory alloy, selecting two sorts of heat-treating regime and changing deformation, the process of stress-indeceed martensite and the characteristic of sress-strain curve in different velocity of strain on Cu-10Al-6Mn-4Zn-0.3Zr (wt%) is studied by metallgraphicalobservation , SEM, MTS, Impact-Extension, the results show:The stress- indeceed martensite are influenced by structures. When - phase of mother-phase presents strip and is surrounded by - phase, it is easily to cause stress- indeced martensite and present the characteristic of relief and licking up each other. When mother-phase is made up of single - phase, it is not easily to observe the characteristic of relief and only in a small quantity of - phase because of relaxation of the displacement can observe it. The shape of sress-strain curve is influenced by strain-rate and structures. The shapes of sress-strain curve in different strain-rate cross each other. In addition, the shape memory effect is also related to the deformation. To curve deformation, when the strain of the outside surface of the curve roughcast attains the strain of martensite yield, the shape memory effect is maximal.更多还原