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投稿时间：2011-02-10
投稿时间：2011-02-10
中文摘要: 研究了B对Al-7Si合金α相形态和力学性能的影响。结果表明，B 对Al-7Si合金具有良好的细化效果；初生α相的形态与大小发生显著变化，树枝晶消失，转变为细小的柱状晶。当加入0. 036%B时，组织最理想：形态密实、尺寸细小而均匀，同时，合金的综合力学性能得到了显著的提高，抗拉强度提高15%、延伸率提高68%、断面收缩率提高46%，弹性模量和硬度分别降低22%和9%，细化后Al-7Si合金表现出良好的强韧性。
Abstract:The influence of B addition on microstructure and mechanical properties of Al-7Si alloy was investigated. The results indicated that B had a good refinement effect on Al-7Si alloy. The morphology and size of primary α varied sharply. The α dendrite disappeared and transformed into the refined columnar grains. When B content was up to 0.036%, the morphology of α dendrite was optimal. Meanwhile, the mechanical properties of the alloy had been improved significantly. The tensile strength, elongation rate and percentage reduction of area had been improved by 15%, 68% and 46%, respectively. However, Young’s modulus and hardness had been decreased by 22% and 9%, respectively.
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基金项目:国家自然科学基金资助项目(50874045)；湖南省科技计划项目(08GK3057)
引用文本：
李小松,蔡安辉,周勇,曾纪杰.B对Al-7Si合金α相形态和力学性能的影响[J].有色金属（冶炼部分）,2011(5):34-37.
LI Xiao-song,Cai An-hui,ZHOU Yong,ZENG Ji-jie.Effects of B Addition on Morphology of Primary α Phase and Mechanical Properties of Hypoeutectic Al-7Si Alloys[J].Nonferrous Metals (Extractive Metallurgy),2011(5):34-37.
李小松,蔡安辉,周勇,曾纪杰.B对Al-7Si合金α相形态和力学性能的影响[J].有色金属（冶炼部分）,2011(5):34-37.
LI Xiao-song,Cai An-hui,ZHOU Yong,ZENG Ji-jie.Effects of B Addition on Morphology of Primary α Phase and Mechanical Properties of Hypoeutectic Al-7Si Alloys[J].Nonferrous Metals (Extractive Metallurgy),2011(5):34-37.
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