用显微维氏硬度仪、X射线衍射仪( XRD)、扫描电子显微镜( SEM)和透射电子显微镜( TEM)研究分析了快速凝固Mg-5 wt-%Sn合金条带的时效硬化规律。实验结果表明,快速凝固Mg-5 wt-%Sn合金在593 K温度下时效3 h后达到峰值硬度。时效后峰值硬度下的快速凝固Mg-5 wt-%Sn合金中有β-Mg2 Sn相颗粒析出,大多数的析出相β-Mg2 Sn颗粒分布在晶界,少部分析出相β-Mg2 Sn颗粒分布在晶粒内部。在593 K温度下时效3 h后的合金中观察到析出相β-Mg2Sn 颗粒与基体α-Mg 的一种新取向关系:(202261)β//(0110)α,(7236)β//(0001)α,[512]β//[2110]α。
Age-hardening behavior of the rapidly solidified Mg-5 wt-%Sn alloy was observed and analyzed by a micro-Vikers hardness tester, X-ray diffraction ( XRD) , scanning electron microscopy ( SEM) and transmission electron microscopy ( TEM) . The results show that the alloy will reach its peak-hardness after ageing-treated at 593 K for 3 h, while the secondary precipitated phaseβ-Mg2 Sn appears along the grain boundary and some appear inside the grain. After ageing-treated at 593 K for 3 h, a new orientation relationship was found:(20 22 61)β// (0110)α,(7 236)β// (0001)α,[512]β// [21 10]α.