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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-Mg2Sn相颗粒析出,大多数的析出相β-Mg2Sn颗粒分布在晶界,少部分析出相β-Mg2Sn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:(20 22 61)β//(0110)α,(7 236)β//(0001)α,[512]β//[21 10]α。
The age-hardening law of rapidly solidified Mg-5 wt.% Sn alloy strip was analyzed by micro Vickers hardness test, X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) The experimental results show that the rapidly solidified Mg-5 wt.% Sn alloy reaches the peak hardness after aging at 593 K for 3 h. Β-Mg2Sn phase precipitates in the Mg-5 wt.% Sn alloy at the peak hardness after aging. Most of the precipitated β-Mg2Sn particles are distributed at the grain boundaries, and a small part of precipitated β-Mg2Sn particles are distributed in the Inside the grain. A new orientation relationship between β-Mg2Sn precipitates and matrix α-Mg was observed in the alloy aged 3 h at 593 K: (20 22 61) β // (0110) α, (7 236) β // (0001) α, [512] β // [21 10] α.