东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2008, Vol. 29 ›› Issue (7): 992-995.DOI: -

• 论著 • 上一篇    下一篇

Mn和Si对Al-Mg-Si-Cu合金组织和性能的影响

何立子;陈彦博;张海涛;崔建忠;   

  1. 东北大学材料电磁过程研究教育部重点实验室;东北大学材料与冶金学院;东北大学材料电磁过程研究教育部重点实验室;东北大学材料电磁过程研究教育部重点实验室 辽宁沈阳110004;辽宁沈阳110004;辽宁沈阳110004;辽宁沈阳110004
  • 收稿日期:2013-06-22 修回日期:2013-06-22 出版日期:2008-07-15 发布日期:2013-06-22
  • 通讯作者: He, L.-Z.
  • 作者简介:-
  • 基金资助:
    国家高技术研究发展计划项目(2006AA03A20)

Effects of Mn and Si on microstructure and mechanical properties of Al-Mg-Si-Cu alloy

He, Li-Zi (1); Chen, Yan-Bo (2); Zhang, Hai-Tao (1); Cui, Jian-Zhong (1)   

  1. (1) Key Laboratory of Electromagnetic Processing of Materials, Northeastern University, Shenyang 110004, China; (2) School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
  • Received:2013-06-22 Revised:2013-06-22 Online:2008-07-15 Published:2013-06-22
  • Contact: He, L.-Z.
  • About author:-
  • Supported by:
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摘要： 通过拉伸实验以及扫描电镜(SEM)、能谱(EDS)和透射电镜(TEM)分析,研究了Mn和Si含量变化对新型Al-Mg-Si-Cu合金显微组织和力学性能的影响.研究结果表明,随Mn含量的增加,合金的时效硬化性降低.当添加质量分数0.35%Mn时,合金的Rm变化不大但ReL和Ae明显提高;继续增至质量分数为0.7%Mn时,强度和延伸率均下降,这是由于添加Mn同时增加了粗大夹杂相和细小弥散相的体积分数所致.随Si含量的增加,合金的时效硬化性提高,合金的Rm提高但ReL和Ae降低,时效强化相β″的析出密度增加.

关键词: Al-Mg-Si-Cu合金, Mn, Si, 时效, 力学性能

Abstract: Effects of Mn and Si contents on microstructure and mechanical properties of the new-type Al-Mg-Si-Cu alloy were investigated by scanning electron microscopy (SEM), energy dispersive spectrum (EDS) and transmission electron microscopy (TEM). The results showed that the age-hardenability of the alloy decreases with increasing Mn content. When adding 0.35% Mn to the alloy, the ultimate tensile strength (Rm) changes little while the yield strength (ReL) and elongation (Ae) increase significantly. When adding 0.7% Mn to the alloy, both the strength and elongation decrease because the volume fractions of both coarse insolube constituents and fine dispersoids increase simultaneously. With the Si content increases, the age-hardenability of the alloy is improved with increasing Rm and decreasing ReL and Ae especially, the density of the age-hardening phase β″ precipitates increase.

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