摘要
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,Mg17Al12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,Mg17Al12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2％Ca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 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 Mg17 Allz was solid solutioned dispersedly into the Mg matrix while AlzCa 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 AMS0 ＋ 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.
出处
《机械工程材料》
CAS
CSCD
北大核心
2006年第8期5-9,共5页
Materials For Mechanical Engineering
基金
上海市科学技术委员会与法国Phone-Alpes地区委员会国际合作基金资助项目(02SL002)
关键词
AM50镁合金
挤压
热处理
钙
magnesium alloy
AM50
extrusion
heat treatment
calcium
