作　　者： ; ; ; ; (陈）;

机构地区： 大连理工大学材料科学与工程学院材料加工工程系

出　　处： 《大连理工大学学报》 1994年第6期667-672,共6页

摘　　要： 以室温组织为马氏体的多晶ＣｕＺｎＡｌ形状记忆合金为试验材料，通过保持一定拉伸应变并在相变温度范围进行热循环实现了记忆合金在周期变化的温度和应力复合作用下的热机循环．用电阻法及应力测定法研究了热机循环中电阻－温度曲线及应力－温度曲线随循环次数的变化规律，对热机循环后合金中的热弹性马氏体转变特征及获得的双程记忆效应进行了研究． The thermal-mechanical(T-M)cycles at constant strain of a polycrystalline CuZnAl alloyare studied by tensile test and electrical resistance measurement.The variations of stress vs.temperature(S-T)curves and electrical resistance vs. temperature(R-T)curves with the T-Mcycling have been determined. It has been found that the properties of polycrystalline CuZnAlalloy show an apparent change in the first cycle. The T-M cycling is a softening process. Afterabout 20 cycles, the S-T curves reaches stable and so does the R-T curves. As the number of T-M cycles increases , the Ms, As , and Af decrease while the Mf remains almost unchanged. Inthe following thermal cycle after T-M cycles, the Ms, Mf, and As are lowered and the Afremains constant, and the amount of martensite undergoing thermoelastic transformation isreduced compared with that of undergoing no T-M cycle. Meanwhile,the samples demonstrateperfect two-way shape memory effect(TWSME)and there exists an appropriate constrainedstrain to get the maximum training efficiency.

关 键 词： 形状记忆合金 马氏体 热处理 热机循环

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]