东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (1): 34-38.DOI: 10.12068/j.issn.1005-3026.2016.01.008

• 材料与冶金 • 上一篇    下一篇

时效时间对变形铝硅合金组织与性能的影响

刘芳, 于福晓, 赵大志, 左良   

  1. (东北大学 材料与冶金学院, 辽宁 沈阳110819)
  • 收稿日期:2014-11-14 修回日期:2014-11-14 出版日期:2016-01-15 发布日期:2016-01-08
  • 通讯作者: 刘芳
  • 作者简介:刘芳(1980-),女,辽宁营口人,东北大学讲师,博士; 于福晓(1965-),男,山东乳山人,东北大学教授,博士生导师; 左良(1963-),男,安徽桐城人,东北大学教授,博士生导师.
  • 基金资助:
    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).

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

LIU Fang, YU Fu-xiao, ZHAO Da-zhi, ZUO Liang   

  1. School of Materials & Metallurgy, Northeastern University, Shenyang 110819, China.
  • Received:2014-11-14 Revised:2014-11-14 Online:2016-01-15 Published:2016-01-08
  • Contact: YU Fu-xiao
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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30min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.

关键词: 变形铝硅合金, 固溶处理, 时效处理, 组织, 力学性能

Abstract: The effects of aging time on microstructure and properties of as-solutioned wrought Al-12.7Si-0.7Mg alloy artificial aged at 180℃ 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 Al-Si alloy aged at 180℃ after solutioning at 520℃ for 30min 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.

Key words: wrought Al-Si alloy, solution treatment, aging treatment, microstructure, mechanical property

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