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| SiC /AZ61镁基复合材料蠕变性能的研究 |
| Study on Creep Properties of SiC/AZ61 Composites Reinforced with SiC Particles |
| Received:July 30, 2009 Revised:September 10, 2009 |
| DOI： |
| 中文关键词: 搅熔铸造 镁基复合材料 蠕变性能 |
| 英文关键词: stirring-melt casting magnesium matrix composites creep properties |
| 基金项目:国家自然科学基金(50765005)；江西省教育厅资助项目 |
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| 中文摘要: |
| 采用搅熔铸造法制备碳化硅颗粒增强镁基复合材料SiC/AZ61，通过动态机械热分析、显微组织观察和XRD衍射分析了其蠕变性能。结果表明：碳化硅颗粒的加入细化了晶粒，SiC大多分布在晶界处，颗粒镁基复合材料的蠕变性能与AZ61合金相比得到了显著的改善。蠕变性能的提高主要因为高温时具有高的热稳定性的SiC颗粒取代晶界处高温下易软化的β相（Mg-17Al-12）钉扎晶界，阻止了晶界的交滑移和位错的攀移。 |
| 英文摘要: |
| SiC/AZ61 composites reinforced with SiC particles was fabricated by Stirring-Melt Casting technique. The creep properties of the composites have been studied by dynamic mechanical thermal analysis, micro-structural and XRD observation. The results show that the matrix grains with SiC particles introduced were refined obviously at high temperature and creep properties of SiC/AZ61 composites were improved comparing with AZ61 alloy. It is because that SiC particles substitute Mg-17Al-12 phase on grain boundaries which are easily intenerated at high temperature. The pinning of SiC particles prevents dislocation and slipage of grain boundary at high temperature. |
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