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有色金属(冶炼部分):2011,(5):34-37
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B对Al-7Si合金α相形态和力学性能的影响
(湖南理工学院机电系)
Effects of B Addition on Morphology of Primary α Phase and Mechanical Properties of Hypoeutectic Al-7Si Alloys
(Department of Mechanical and Electrical Engineering, Hunan Institute of Science and Technology)
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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。
中文关键词: Al-7Si  晶粒细化  组织  力学性能
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.

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