Al_2O_3微粒的尺度律对镁微观组织和拉伸性能的影响  

Effects on Magnesium Microstructure and Mechanical Properties of the Scaling Laws of Al_2O_3 Micro-particles

作　　者：王艳彬[1,2] 陈嫚丽[1,2] 赵志翔[1,2] 

机构地区：[1]国防科技工业精密塑性成形研究应用中心,重庆400039 [2]中国兵器工业第五九研究所,重庆400039

出　　处：《精密成形工程》2011年第2期15-19,30,共6页Journal of Netshape Forming Engineering

摘　　要：采用混合-压缩-烧结的方法制备了3种不同尺寸且体积分数为1.1%的Al2O3微粒增强镁基复合材料。材料微观组织的特征表明:Al2O3增强体分布均匀。力学性能特征表明:增强体Al2O3微粒的加入显著增加了金属镁的硬度、屈服强度(0.2%)、极限抗拉强度及韧性;与高体积分数SiC微粒增强镁合金AZ91相比,纳米和亚微米尺度的Al2O3颗粒增强纯镁的屈服强度(0.2%)、极限抗拉强度和韧性更高。Three kinds of magnesium-matrix composites with different sizes reinforced by 1.1%（volumetric fraction） Al2O3 micro-particles were prepared by the mixture-compression-sinter method.The characteristics of the material microstructure show that the reinforcement of Al2O3 micro-particles uniformly disperses and the particles bring about a striking reinforcement effect.The mechanical properties show that the hardness,yield strength（0.2%）,ultimate tensile strength and toughness of magnesium significantly increase with the Al2O3 micro-particles dispersing in the magnesium-matrix composites.Compared with AZ91 magnesium alloy reinforced by SiC micro-particles with a higher volume fraction,the magnesium alloys reinforced by nano-sized and sub-micrometer Al2O3 particles offer comparatively higher yield strength（0.2%）,ultimate tensile strength and toughness.

关 键 词：镁 强化 微观组织 力学性能 韧性 

分 类 号：TG146.22[一般工业技术—材料科学与工程]