铸造Al-Si-Cu-Mg合金最佳热处理工艺的研究  

Optimization of Heat Treatment Parameters of Al-Si-Cu-Mg Casting Alloy

作　　者：李润霞[1] 李晨曦[1] 李荣德[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110023

出　　处：《铸造》2006年第10期1015-1019,共5页Foundry

摘　　要：通过对高强度铸造Al-Si-Cu-Mg合金热处理工艺参数的研究发现:合金的硬度随着固溶温度的提高逐渐增大,且达到硬度峰值的时间逐渐缩短,但高于525℃固溶处理时,反而下降;一定温度以上时效处理时,合金的时效曲线上出现了双硬度峰,且第一个峰大于第二个峰。随着合金时效温度的升高,合金的硬化速度加快,但硬化能力下降。通过热处理工艺参数的正交实验发现,时效温度对合金强度的影响最为显著,而对合金伸长率影响最为显著的是固溶温度。综合考虑各因素中不同水平的优劣,确定Al-Si-Cu-Mg合金的最佳热处理工艺为:525℃×12 h+175℃×6 h。This paper has studied the heat treatment parameters of high strength Al-Si-Cu-Mg casting alloy. It is found that hardness of the alloy increases and the time of peak hardness decreases with the temperature increase of solution treatment, but hardness decreases when solution temperature exceeds certain temperature. There are double aging peaks during aging when treated higher than certain temperature and the first one is larger than the other. With the increase of aging temperature the speed of aging hardening increases but the hardening ability of alloy decreases. The results of orthogonal experiment show that the optimization heat treatment process for high strength Al-Si-Cu-Mg casting alloy should be 525 ℃×12 h＋175℃×6 h.

关 键 词：铸造AL-SI-CU-MG合金 固溶处理 时效硬化 力学性能 

分 类 号：TG156[金属学及工艺—热处理]