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稀土 La 对铸造 Al-Si 合金组织与性能的影响
Effect of Rare Earth La on the Microstructure and Properties of Cast Al-Si Alloy
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- DOI:
- 作者:
- 谷立东 1 ，王乐耘 1 ，应 韬 1 ，杨剑英 2 ，李德江 1
GU Lidong 1 , WANG Leyun 1 , YING Tao 1 , YANG Jianying 2 , LI Dejiang 1
- 作者单位:
- 1. 上海交通大学 材料科学与工程学院，上海 200240；2. 上海交通大学 包头材料研究院，内蒙古 包头 014000
1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Baotou Institute of Material Research, Shanghai Jiao Tong University , Baotou 014000, China
- 关键词:
- 铝硅合金；稀土；共晶硅；力学性能
Al-Si alloy; rare earth; eutectic silicon; mechanical property
- 摘要:
- 研究了不同含量的稀土 La 对铸造铝硅二元合金的显微组织与性能的影响。 结果表明，少量 La 的加入可使共晶硅组织聚集情况改善，对基体割裂减弱，当 La 含量为 0.15%( 质量分数 ) 时，可使铝基体具有细化的近非枝晶组织，同时微观上共晶硅的尺寸显著减小。 随着 La 含量的增加，铝硅合金的屈服强度与伸长率呈现先增加后稳定的趋势，电导率递增。共晶硅的细化有利于降低 Si 对电子散射的阻挡，从而使合金电导率提升。综合来看，当选用 0.15% 的 La 加入时，铸造铝硅合金具有综合最优的显微组织、力学性能和导电性能。The effects of different contents of rare earth La on the microstructure and properties of cast Al-Si binary alloys were investigated. The results indicate that the addition of a small amount of La can improve the aggregation of eutectic silicon, weaken the cleavage of the matrix, and refine the nearly nondendritic microstructure of the aluminium matrix when the La content is 0.15 wt. %. Moreover, the size of eutectic silicon is significantly reduced. As the La content increases, the yield strength and elongation of the Al-Si alloy initially increase and then stabilize, while the electrical conductivity gradually increases. The refinement of eutectic silicon reduces the hindrance of Si to electron scattering, thereby enhancing the electrical conductivity of the alloy. Overall, when 0.15 wt. % La is added, the cast Al-Si alloy has the best overall microstructure, mechanical properties and conductivity.