时效时间对变形铝硅合金组织与性能的影响  

Effects of Aging Time on Microstructure and Properties of Wrought Al-Si Alloy

作　　者：刘芳[1] 于福晓[1] 赵大志[1] 左良[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2016年第1期34-38,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51401047);中央高校基本科研业务费青年教师科研启动基金资助项目(N130302002)

摘　　要：研究不同固溶态Al-12.7Si-0.7Mg变形合金在180℃进行不同时间的人工时效处理,分析了时效时间对合金组织和力学性能的影响.结果表明:不同固溶态合金的时效强化的曲线表现出不同的单、双峰时效强化特征.变形铝硅合金经520℃固溶30 min随后180℃时效强化曲线存在明显的时效强化"双峰",并且第二个时效强化峰高于第一个时效强化峰.时效强化的单、双峰现象与合金的时效析出相的类型、尺寸以及析出序列密切相关.合金亚稳相的转变有明显的时间间隔,使合金时效强化曲线出现了"双峰"现象.The effects of aging time on microstructure and properties of as-solutioned wrought Al-12. 7Si-0. 7Mg alloy artificial aged at 180 ~C for different time were investigated. The results showed that the age hardening curves of different as-solutioned state alloys present single or twin peaks aging strengthening characteristics. Age hardening curve of wrought A1-Si alloy aged at 180 ~C after solutioning at 520 ~C for 30 rain exhibits obvious age hardening ＂twin peaks＂, and the second age hardening peak is higher than the first one. The single and twin peaks age hardening phenomenon of alloy is closely related to the type, size, and the precipitation sequence of precipitates. The obvious interval during meta-stable phase transformation of alloy is the main reason for twin peaks aging hardening.

关 键 词：变形铝硅合金 固溶处理 时效处理 组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]