微量Ag对Al-5．3Cu-0．8Mg合金组织与时效行为的影响  

Effects of Micro-alloy Ag on Microstructure and Aging Behaviour of Al-5.3Cu-0.8Mg Alloy

作　　者：董晓超[1] 屈华[1] 陶瑜[1] 姜海洋[1] 孙维勋[1] 王健[1] 张涛[1] 

机构地区：[1]辽宁工业大学材料科学与工程学院,锦州121001

出　　处：《金属材料研究》2013年第2期1-5,共5页Research on Metallic Materials

基　　金：辽宁工业大学大学生创新创业训练计划项目“Al-Cu-Mg-Ag合金时效析出相析出行为的研究（2012032）”;辽宁工业大学2012教师科研启动基金项目“Al-Cu-Mg-Ag合金时效析出相析出行为的研究（2012-7）”

摘　　要：通过固溶-时效处理及显微组织分析，研究了微量Ag对Al—5．3Cu—0．8Mg合金组织与时效行为的影响。结果表明，Ag的加入改变了合金的时效过程，Ag与Mg的强烈作用能够抑制合金GP区的析出，促进片状强化相Q的析出；随着Ag含量的增加，析出强化相Q的时间明显缩短，达到时效峰值的时间也明显减少；不同含Ag量的Al—5．3Cu-0．8Mg合金的硬度都随时效时间的延长先增加后减小，Al—5．3Cu—0．8Mg-0．45Ag达到Hv172时效峰值的时间为9h，Al-5．3Cu-0．8Mg—0．6Ag合金达到Hv165时效峰值的时间为6h；随着Ag含量的增加，Al—5．3Cu-0．8Mg合金铸态组织的硬度增加，当Ag含量达到0．6％时，硬度达到峰值。By the solution-aging treatment and microstructure analysis, the alloying effect of trace Ag on the microstructure and aging behavior of Al-5.3Cu-0.8Mg alloy was investigated. The results show that the addition of Ag have an effect on the aging process, the strong interaction of Mg and Ag will restrain the precipitation of GP zone and promote the precipita- tion of flake strengthening phase Ω. With an increase of Ag, the decrease of precipitation time of strengthening phase Ω is obviously and the same to aging time for reaching to the hardness peak. The peak aging time of Al-5.3Cu-0.8Mg-0.4SAg alloy is 9 h and that of Al- 5.3Cu-0.8Mg-0.6Ag alloy is 6 h. The hardness values of Al-5.3Cu-0.8Mg alloy with differ- ent Ag both increases first and then decreases as prolonging the aging time. The hardnegs of as-cast microstructure of Al-5.3Cu-0.8Mg alloy increases with the increase of Ag, when the amount of Ag in the alloy is 0.6 %, the hardness value is the highest, and then the increase of the Ag content has little effect to hardness.

关 键 词：Al-Cu—Mg—Ag合金 组织 时效 硬度 Q相 

分 类 号：TG146.21[一般工业技术—材料科学与工程]