挤压铸造Al-25Zn-10Si合金的组织与性能
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摘要
在ZL102中加入纯Zn、纯Mg,得到Al-12.4Si-4.5Cu及Al-25Zn-10Si-5Mg合金,研究了挤压铸造成形合金的性能。结果表明,两组合金的最佳工艺方案相同,即模具预热温度为240℃,压力为150kN,保压时间为16s,浇注温度为630℃;挤压铸造件经过淬火时效处理之后,微观组织比未经热处理的微观组织均匀、细小,且硬度明显提高。加入5%的Mg元素后,合金组织性能优于不加Mg的。
Al-12.4Si-4.5Cu and Al-25Zn-10Si-5Mg alloy were prepared by adding pure Zn and pure Mg into the ZL102 alloy.Properties of the two alloy prepared were analyzed by squeezing casting.The results reveal that the optimized processing parameters for the two alloy is the same including preheating mould at 240 ℃,pressure of 150 kN for 16 sand pouring at 630 ℃.After quenching and aging treatment,microstructure of the squeezing castings exhibits more homogeneous and finer compared with that of one without heat treatment.Meanwhile,hardness is increased significantly.With 5% Mg addition,the microstructure and properties of the alloy are superior to those of the initial alloy.
Al-12.4Si-4.5Cu and Al-25Zn-10Si-5Mg alloy were prepared by adding pure Zn and pure Mg into the ZL102 alloy.Properties of the two alloy prepared were analyzed by squeezing casting.The results reveal that the optimized processing parameters for the two alloy is the same including preheating mould at 240 ℃,pressure of 150 kN for 16 sand pouring at 630 ℃.After quenching and aging treatment,microstructure of the squeezing castings exhibits more homogeneous and finer compared with that of one without heat treatment.Meanwhile,hardness is increased significantly.With 5% Mg addition,the microstructure and properties of the alloy are superior to those of the initial alloy.
引文
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[4]赵恒义,周天西,袁燕.挤压铸造工艺及发展应用现状[J].热加工工艺,2000(2):45-46.
[5]罗守靖,陈炳光,齐丕骧.挤压铸造与挤压铸造技术[M].北京:化学工业出版社,2006.
[6]齐丕骧.我国挤压铸造机的现状与发展[J].特种铸造及有色合金,2010,30(4):305-308.
[7]唐多光,徐张翼,沈友良.铝合金挤压铸造若干技术问题的讨论[J].特种铸造及有色合金,2002(6):28-29.