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材料工程  2019, Vol. 47 Issue (2): 90-98    DOI: 10.11868/j.issn.1001-4381.2018.000570
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
微量Sr及均匀化工艺对Al-Mg-Si-Cu-Mn变形铝合金铸态组织与性能的影响
李灿, 陈文琳, 雷远
合肥工业大学 材料科学与工程学院, 合肥 230009
Effect of minor strontium and homogenization process on as-cast microstructure and mechanical properties of Al-Mg-Si-Cu-Mn wrought aluminum alloy
LI Can, CHEN Wen-lin, LEI Yuan
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
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摘要 采用光学显微镜、扫描电镜、差热分析、X射线衍射分析及硬度测试、电导率测试、拉伸测试等方法,研究了0%~0.09% Sr(质量分数,下同)含量和均匀化工艺对Al-Mg-Si-Cu-Mn变形铝合金铸态组织及性能的影响,并对合金铸态组织及均匀化退火过程中第二相的演变进行了分析。结果表明:Al-Mg-Si-Cu-Mn铸态合金主要包括AlCuMgSi,Mg2Si,AlSi,Al2Cu,Al(MnFe)Si,AlMnSi和Al(MnCrFe)Si等结晶相,在合金中加入0.06% Sr可使铸锭中针状Si相转变为球状相,并促进球状AlFeSi型结晶相的形成,减小了应力集中,提高了合金铸态的强度及塑性;在均匀化退火过程中,随保温时间的延长,块状相和低熔点共晶组织溶解,Al(MnCrFe)Si相由原来的三角块状和针状相转变成细小的颗粒状相,Al-Mg-Si-Cu-Mn-Sr合金的最佳均匀化热处理工艺为540℃×8h。
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李灿
陈文琳
雷远
关键词 Al-Mg-Si-Cu-Mn-Sr合金第二相均匀化处理力学性能    
Abstract:The effect of various amounts of Sr (0%-0.09%,mass fraction, the same below) and homogenization treatment on the as-cast microstructure and mechanical properties of Al-Mg-Si-Cu-Mn alloy was investigated by optical microscopy, scanning electron microscopy, differential thermal analysis, X ray diffraction analysis and hardness test, electrical conductivity test and tensile test. The evolution of the second phase in as-cast microstructure and homogenization annealing process were also studied. The results show that the Al-Mg-Si-Cu-Mn alloy mainly includes AlCuMgSi,Mg2Si,AlSi,Al2Cu,Al(MnFe)Si,AlMnSi and Al(MnCrFe)Si phases. The addition of 0.06%Sr in the alloy can transform the needle-like AlSi phase into spherical AlSi phase, and promote the formation of AlFeSi spherical crystalline phase which reduces the stress concentration and improve the strength and plasticity of the alloy. During homogenization,the bulk-like phases and low melting eutectics are dissolved. The Al(MnCrFe)Si phase turns from the original trigonometric and needle-like phases into fine granular phases which are more favourable for the material processing. The homogenization heat treatment process of 540℃ for 8h is suitable for Al-Mg-Si-Cu-Mn-Sr alloy.
Key wordsAl-Mg-Si-Cu-Mn-Sr alloy    the second phase    homogenization treatment    mechanical property
收稿日期: 2018-05-17      出版日期: 2019-02-21
中图分类号:  TG146.21  
通讯作者: 陈文琳(1963-),女,博士,教授,从事精密塑性成形研究,联系地址:安徽省合肥市包河区屯溪路193号合肥工业大学材料学院,E-mail:chenwl@hfut.edu.cn     E-mail: chenwl@hfut.edu.cn
引用本文:   
李灿, 陈文琳, 雷远. 微量Sr及均匀化工艺对Al-Mg-Si-Cu-Mn变形铝合金铸态组织与性能的影响[J]. 材料工程, 2019, 47(2): 90-98.
LI Can, CHEN Wen-lin, LEI Yuan. Effect of minor strontium and homogenization process on as-cast microstructure and mechanical properties of Al-Mg-Si-Cu-Mn wrought aluminum alloy. Journal of Materials Engineering, 2019, 47(2): 90-98.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.000570      或      http://jme.biam.ac.cn/CN/Y2019/V47/I2/90
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