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| 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 |
| Received:July 13, 2010 Revised:March 10, 2011 |
| DOI： |
| 中文关键词: 镁 强化 微观组织 力学性能 韧性 |
| 英文关键词: magnesium reinforcing microstructure mechanical properties toughness |
| 基金项目: |
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| 中文摘要: |
| 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Al-2O-3微粒增强镁基复合材料。材料微观组织的特征表明：Al-2O-3增强体分布均匀。力学性能特征表明：增强体Al-2O-3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Al-2O-3颗粒增强纯镁的屈服强度(0.2%)、极限抗拉强度和韧性更高。 |
| 英文摘要: |
| Three kinds of magnesium-matrix composites with different sizes reinforced by 1.1% (volumetric fraction) Al-2O-3 micro-particles were prepared by the mixture-compression-sinter method. The characteristics of the material microstructure show that the reinforcement of Al-2O-3 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 Al-2O-3 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 Al-2O-3 particles offer comparatively higher yield strength(0.2%), ultimate tensile strength and toughness. |
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