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| Effects of B Addition on Morphology of Primary α Phase and Mechanical Properties of Hypoeutectic Al-7Si Alloys |
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Received:February 10, 2011
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| DOI：DOI：10.3969/j.issn.1007-7545.2011.05.009 |
| KeyWord:Al-7Si; Grain refinement; Microstructure; Mechanical property |
| Author | Institution |
| LI Xiao-song |
湖南理工学院机电系 |
| Cai An-hui |
湖南理工学院机电系 |
| ZHOU Yong |
湖南理工学院机电系 |
| ZENG Ji-jie |
湖南理工学院机电系 |
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| 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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