热处理对挤压添加钙AM50镁合金组织及力学性能的影响

研究了固溶、时效对挤压添加钙的三种AM50镁合金组织和力学性能的影响。结果表明：合金挤压后，随着固溶时间的增加，Mg17，Al12相以弥散状溶解在基体镁中，而Al2Ca相相当稳定，部分变细，逐步断开并出现球化现象；随着时效时间的增加，Mg177Al12相以粒状从基体中析出，而Al2Ca相在时效过程中变化极小。固溶后，挤压合金的硬度和抗拉强度下降。时效后，挤压添加1％Ca的合金抗拉强度略有升高，未加和加入2％Ca的抗拉强度略有下降，三种合金的硬度增加到峰值后逐步下降。未加和加入29，6Ca的合金固溶后塑性显著增加，时效后塑性略有下降；而加入1％Ca的合金固溶后塑性略有下降，时效后塑性显著提高。

Effects of Heat Treatment on Microstructure and Mechanical Properties of Extruded AM50+xCa Magnesium Alloys

Effects of solution and aging treatment on microstructure and mechanical properties of extruded AM50+xCa alloys(x=0, 1, 2 wt%) were studied. With solution time increasing, the secondary phase Mg17Al12 was solid solutioned dispersedly into the Mg matrix while Al2Ca was rather stable, partly became thinner , then gradually broken and spheroidized. With aging time increasing, Mg17 Al12 was precipitated from the Mg matrix as the form of particles and Al2Ca changed a little. After solution treatment, the hardness and tensile properties of extruded AM50+xCa alloys decreased. After aging treatment, the alloy hardness increased to its peak fast then decreased, tensile properties of AM50 and AM50+2%Ca decreased a little while tensile properties of AM50 + 1% Ca increased a little. The ductility of extruded AM50 and AM50 + 2%Ca increased remarkably after solution treatment and decreased a little after aging treatment, while ductility of extruded AM50 + 1%Ca decreased a little after solution treatment and increased remarkably after aging treatment