湖南大学学报（自然科学版）2011，Vol.38Issue(5)：64-68,5.
楔压加工对Al-20Si合金铸造管坯组织性能的影响
Effects of Microstructures and Mechanical Properties of Casting A1-20Si Alloy Pipe During Wedge Pressing
摘要
Abstract
In order to eliminate the pores and shrinkage porosity in the casting aluminum silicon alloy,and improve the microstructures and the mechanical properties of the alloy, large size Al-Si alloy pipes were prepared with gravity casting. A new wedge pressing process for compressing large scale porous tubular performances was adopted on the basis of the idea of accumulating local small deformation as to integral forming. The rule of the wedge pressing process and microstructures and the mechanical properties of the alloy were investigated with hardness tests, tensile tests and SEM. The results have shown that the wedge pressing process can markedly eliminate the pores and shrinkage porosity in gravity casting performances. The coarse primary silicon was crushed, and most of the eutectic silicon was refined and distributed uniformly in the matrix. The mechanical properties and density of the gravity casting increased from 112 MPa, 1.2％ and 2.48g/cm3 to 203 MPa, 5.2％ and 2.68g/cm3 respectively after the reduction of 40％.关键词
楔压/致密化/重力铸造/过共晶铝硅合金/铝合金Key words
wedge pressure/ densification / gravity casting / hypereutectic aluminum silicon alloy / aluminum alloys分类
矿业与冶金引用本文复制引用
陈鼎,王灿让,陈振华,范才河,何武强..楔压加工对Al-20Si合金铸造管坯组织性能的影响[J].湖南大学学报（自然科学版）,2011,38(5):64-68,5.基金项目
国家自然科学基金资助项目(50974058) （50974058）
