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重力铸造制备了Mg-5.8Sm-0.4Zn-0.3Zr(SZ58K)镁合金,对其进行固溶处理,并绘制了时效曲线。采用X射线衍射分析(XRD)、光学金相分析(OM)、扫描电子显微分析(SEM)等手段,研究了热处理(固溶处理、时效处理)对SZ58K镁合金的显微组织和力学性能的影响。结果表明,合金的铸态组织由α-Mg基体和晶界附近的Mg41Sm5相组成;固溶处理后,第二相组织分解,晶体内部出现少量小尺寸方块状相,其主要成分为Sm;晶粒尺寸略微长大,抗拉强度和塑性大幅提高,但屈服强度无明显变化;再经过时效处理(T6)后,屈服强度大幅提高,但由于塑性剧烈下降,抗拉强度提高幅度较小。
Mg-5.8Sm-0.4Zn-0.3Zr (SZ58K) magnesium alloy was prepared by gravity casting, and then solution-treated. The aging curve was drawn. The microstructure and mechanical properties of SZ58K magnesium alloy treated by heat treatment (solution treatment and aging treatment) were studied by X-ray diffraction (XRD), optical metallography (OM) and scanning electron microscopy (SEM) Impact. The results show that the as-cast microstructure of the alloy consists of α-Mg matrix and Mg41Sm5 phase near the grain boundary. After solution treatment, the second phase decomposes and a small amount of small- The grain size grows slightly, the tensile strength and plasticity increase greatly, but the yield strength does not change obviously. After aging treatment (T6), the yield strength increases greatly, but the tensile strength increases less due to the drastic decrease of plasticity.