添加钙和钛对Mg-12Al-2Sr-0.3Mn镁合金组织与性能的影响  

Effects of Calcium and Titanium on Microstructure and Properties of Mg-12Al-2Sr-0.3Mn Magnesium Alloy

作　　者：王小明[1] 邹利华[1] 罗玉梅[1] 宁爱林[1] 

机构地区：[1]邵阳学院机械与能源工程系,邵阳422000

出　　处：《机械工程材料》2016年第2期71-75,共5页Materials For Mechanical Engineering

摘　　要：研究了分别添加质量分数均为0.3%的钙、钛以及复合添加钙和钛对Mg-12Al-2Sr-0.3Mn镁合金显微组织和力学性能的影响。结果表明:添加钛提高了该镁合金的塑性和强度,然而Mg17Al12相聚集析出形成粗大的第二相组织;添加钙后提高了该镁合金的塑性,但沿晶界大量析出了连续网状Mg17Al12相,导致其强度略有下降;复合添加钛和钙既增加了共晶相数量又细化了共晶相组织,使得该镁合金铸态组织更加细小均匀,从而显著提高了其强度和韧性。The effects of the addition of 0, 3wt% calcium, 0. 3wt% titanium, and combined addition of 0.3wt% calcium and 0.3wt% titanium respectively on the microstruetures and mechanical properties of Mg-12Al- 2Sr-0.3Mn magnesium alloy were studied. The results show that the titanium addition improved the plasticity and strength of the magnesium alloy, though Mg17Al12 phase was aggregated and precipitated, resulting in the formation of the second phase with a coarsened microstructure. When added with calcium, the plasticity of the magnesium alloy increased while the strength decreased due to a great number of continuous nevlike Mg17Al12 phases precipitated along the grain boundaries. The euteetic phase quantity increased and its microstructures were refined after the combined addition of titanium and calcium, and then the as-cast microstructure of the magnesium alloy became a relatively fine and uniform, resulting in a significant increase of the strength and toughness.

关 键 词：Mg-12Al-2Sr-0.3Mn镁合金 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]