浇铸工艺对AZ91D镁合金组织的影响  

Effect of Casting Process on Microstructure of AZ91D Magnesium Alloy

作　　者：王瑞权[1] 黄海军[1] 冯旭东[2] 李明娥[1] 

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]河南理工大学材料科学与工程学院,河南焦作474003

出　　处：《有色金属与稀土应用》2010年第3期23-26,16,共5页Non-Ferrous Metals & Rareearth

摘　　要：系统研究了冷却速率、浇注温度、浇注尺寸等工艺对镁合金组织的影响。结果表明：随着冷却速率的增大，合金凝固组织中的β-Mg17Al12相的量逐渐增多，晶粒逐渐减小；随着浇注温度的升高，其铸态组织逐渐钝化，由蔷薇状组织逐渐变成细小的等轴晶；随着浇注尺寸的增大，从铸件边缘到中心的晶粒大小差别也增大，铸件中心晶粒也依次增大。The effect of the cooling rate, pouring temperature and casting size on magnesium alloy microstructure are investigated. It is showed that： With the cooling rate increases, the alloy solidification structure of the β-Mg17Al12 phase was gradually increased, grain size decreased gradually; With the pouring temperature, its microstructure gradual passivation, change from Rose-like organization to small equiaxed grains; with the cast size increases, the grain size difference is also increased from the casting edge to the center, grain in the center is also increased.

关 键 词：镁合金 冷却速率 浇注温度 浇注尺寸 

分 类 号：TG146.21[一般工业技术—材料科学与工程]