摘要
采用不同厚度冷铁对不同壁厚ZLSi7Cu2Mg合金铸件激冷后的金相组织及力学性能进行实验研究。结果表明,凝固速度对铝合金材料金相组织中α枝晶及共晶硅颗粒形状和大小有明显影响,细密的α枝晶和比较圆整的共晶硅颗粒可使铝合金获得很好的抗拉强度以及伸长率;随着冷铁厚度的增加,距离冷铁越近的位置,获得的金相组织越细密,力学性能越好;对于ZLSi7Cu2Mg合金而言,冷铁的激冷距离不会随冷铁厚度的增加而持续增强。
The microstructures and mechanical properties of different wall thickness ZLSi7Cu2Mg alloy castings which were chilled by different thickness chill iron were investigated. The results indicated that the solidification rate have significant effects on the shape and size of α dendritic crystal and eutectic silicon particles of the aluminum alloy, smaller α dendritic crystal and rounding eutectic silicon particles could make aluminum alloy obtain good tensile strength and elongation. The metallographic structure of the material became smaller with the increasing of chill iron thickness and the closer between castings and chill iron, which improved the mechanical properties of the alloy. Cold iron chill range will not continue to enhance with the increasing of its thickness for ZLSi7Cu2Mg alloy.
出处
《铸造技术》
CAS
北大核心
2014年第4期763-765,共3页
Foundry Technology
关键词
铝合金
冷铁
力学性能
微观组织
aluminum alloy
chilling block
mechanical properties
microstructure
