铸造2012，Vol.61Issue(3)：258-261,4.
人工时效与自然时效对Al-7Si-0.6Mg铝合金组织与力学性能的影响
Effect of Artificial Aging and Natural Aging on Microstructure and Mechanical Properties of Al-7Si-0.6Mg Aluminum Alloys
夏峰 1李建平 1李高宏 1朱满1
作者信息
- 1. 西安工业大学材料与化工学院,陕西西安710032
- 折叠
摘要
Abstract
The effects of the combination use of artificial aging and natural aging on mechanical properties of Al-7Si-0.6Mg cast aluminum alloys were investigated in detail. The experimental results reveal that the mechanical properties can be improved when the alloys were treated as follows: solution treatment at 535 °C for 10 h, followed by water quenching, then artificial aging at 165℃ for 1 h, followed by natural aging, and then artificial aging at 165℃ for 5 h. The best mechanical properties were reached with σb=321 Mpa and δ=12%, which is 7.7% and 140% larger than that of the T6-treated alloys. Many fine equiaxial dimples were uniformly distributed in fracture of sample, which implied ductile rupture of the sample. The improvement of mechanical properties was ascribed to the spheroidization and distribution of eutectic silicon, Mg2Si-phase precipitation strengthening, and the interaction between Si precipitates and dislocation.关键词
人工时效/自然时效/Al-7Si-0.6Mg铸造铝合金/力学性能Key words
artificial aging/natural aging/Al-7Si-0.6Mg cast aluminum alloy/mechanical property分类
矿业与冶金引用本文复制引用
夏峰,李建平,李高宏,朱满..人工时效与自然时效对Al-7Si-0.6Mg铝合金组织与力学性能的影响[J].铸造,2012,61(3):258-261,4.
