热处理对消失模铸造AZ91-0．6MM-0．5Cd合金组织及力学性能的影响  

Effects of Heat Treatment on Microstructure and Mechanical Properties of Lost Foam Casting AZ91-0.6MM-0.5Cd Alloy

作　　者：田学锋[1] 樊自田[2] 黄乃瑜[2] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004 [2]华中科技大学塑性成型模拟及模具技术国家重点试验室,湖北武汉430074

出　　处：《铸造》2008年第3期226-229,共4页Foundry

基　　金：国家自然科学基金资助项目(50275058)

摘　　要：对不同热处理条件下消失模铸态AZ91-0.6MM-0.5Cd合金的组织、力学性能进行了研究。结果表明,消失模铸造AZ91-0.6MM-0.5Cd合金在420℃固溶处理时,只有Mg17Al12相溶入基体中,Al4Ce(La)和Al8Mn5相能够稳定存在。在低温150℃时效处理时,Mg17Al12相主要在晶界处以不连续形态析出,而在380℃时效时,Mg17Al12相在晶内各处以连续形态析出。经过热处理后合金的综合力学性能有较大的提高,尤其是抗拉强度、伸长率及冲击韧性提高最多。The microstructures and properties of AZ91-0.6MM-0.5Cd alloy via lost foam casting （LFC） were investigated under various heat treatment conditions. The results showed that the Al4Ce （La） and Al8Mn5 precipitates can exist steadily at the solid-solution temperature of 420 ℃ while the unstable Mg17Al12 precipitates dissolve into matrix. The precipitates appear in different patterns for solid-solution AZ91-0.6MM-0.5Cd alloy aged at 380 ℃ and 150 ℃： continuous form in the grains and discontinuous form at grain boundary, respectively. The mechanical properties of the alloy, especially tensile strength, elongation and impact toughness, are significantly improved after the heat treatment.

关 键 词：镁合金 消失模铸造 微观组织 力学性能 

分 类 号：TG166.3[金属学及工艺—热处理]