β_1相中温时效对Cu-12.37Al-3.14Mn-0.10Zr合金马氏体转变特性及其结构的影响

Effect of aging at average temperature in β_1-phase on the transformation characteristic and structure of martensite in Cu-12.37Al-3.14Mn-0.10Zr alloy

利用电阻 温度曲线测量 ,X射线衍射 ,透射电镜观察等方法研究了Cu 12 .3 7Al 3 .14Mn 0 .10Zr合金母相状态时效时马氏体转变特性及其结构的变化。结果表明 ,该合金具有较强的抗中温母相时效性能 ,在 40 0℃的母相状态时效 96h后仍具有良好的热弹性马氏体转变特性 ,可逆马氏体转变量高达90 %以上。时效初期 ,马氏体相变点有所上升 ,但上升幅度仅10～ 15℃左右 ,后期变化不大。该合金淬火态马氏体具有M 2H结构 ,随时效时间的延长 ,逐步变化为M 18R结构。该合金时效析出相为γ2 相 ,它的析出导致母相基体贫Al,电子浓度下降 ,从而产生马氏体相变点升高。

The transformation characteristic and structure changes of martensite of the Cu-12.37 Al-3.14 Mn-0.10 Zr alloy aging at average temperature were studied by means of R-T carve, X-ray diffraction and electron diffraction. It was convinced that the tested alloy has a high properties of aging-resistance at average temperature in the parent phase. It has a good thermoelastic martensite transformation characteristic after aging at 400°C for 96 h in the parent phase, the reversible martensite is up to 90%. The martensite characteristic temperature (Ms) slightly rises for 10-15°C during early aging, and was almost constant during later aging. The quenched martensite has M2H structure, and it transforms gradually into M18R with elongation of the aging time. During aging the γ2-phases precipitate, which causes that the basal body leans Al and the electron concentration falls down. And this leads the rising of the martensite characteristic temperature (Ms) and the change of the martensite structure.