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Sr、B和RE复合变质对Al-30Si合金组织和性能的影响
Effect of Compound Modification of Sr, B and RE on Microstructure and Properties of Al-30Si Alloy
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- DOI:
- 作者:
- 万辉 李小松 李铁林 蔡安辉 罗云
WAN Hui;LI Xiaosong;LI Tielin;CAI Anhui;LUO Yun
- 作者单位:
- 湖南理工学院机械工程学院
College of Mechanical Engineering,Hunan Institute of Science and Technology,Yueyang 414000,China
- 关键词:
- 锶硼稀土复合变质 AL-30SI 显微组织 力学性能
Sr-B-RE compound modification Al-30Si microstructure mechanical properties
- 摘要:
- 研究Sr、B和RE复合变质对Al-30Si合金组织与性能的影响。结果表明,细化变质处理后的合金组织形貌发生了显著变化,α(Al)相枝晶群消失,转变为等轴晶或柱状晶;初晶硅颗粒细化,棱角钝化;针状的共晶硅变成短杆状或颗粒状,分布均匀。合金抗拉强度提高55%,伸长率增加约66%,硬度略有增加。当RE含量为0.5%～0.8%时,合金表现出较好的综合力学性能。The effect of compound modification of Sr, B and RE on microstructure and properties of Al-30 Si alloy was studied. The results show that the microstructure and morphology of the alloy change significantly after refinement and modification, and the dendritic groups of α(Al) phase disappeared and are transformed into equiaxed or columnar crystals.Primary silicon granules are refined and edges and corners are passivated. Acicular eutectic silicon becomes short rod-shaped or granular and evenly distributed. The tensile strength, elongation and hardness of the alloy increase by 55%and 66%, respectively. When RE content is 0.5~0.8%, the alloy exhibits better comprehensive mechanical properties.