+高级检索
SrY添加对A356铝合金显微组织和力学性能的影响及机理
作者:
作者单位:

1.昆明理工大学 材料科学与工程学院,云南 昆明 650093;2.昆明冶金研究院有限公司,云南 昆明 650031;3.西南石油大学 工程学院,四川 南充 637001

作者简介:

通讯作者:

中图分类号:

TG146.21

基金项目:

Major Science and Technology Project in Yunnan Province-New Material Special Project (202102AB080015, 202102AB080004, 2018ZE005, 2019ZE001)


Effect of Sr and Y Addition on Microstructure and Mechanical Properties of A356 Aluminum Alloy and Its Mechanism
Author:
Affiliation:

1.Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;2.Kunming Metallurgical Research Institute Co., Ltd, Kunming 650031, China;3.School of Engineering, Southwest Petroleum University, Nanchong 637001, China

Fund Project:

Major Science and Technology Project in Yunnan Province-New Material Special Project (202102AB080015, 202102AB080004, 2018ZE005, 2019ZE001)

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    通过金相显微镜、扫描电镜、透射电镜观察,能谱分析以及力学性能实验,研究了添加Sr和Y对A356铝合金显微组织和力学性能的影响。结果表明,相比于单加Sr或Y,复合添加Sr和Y时,共晶Si由板片状或针状完全转变为纤维状,α-Al的等效晶粒直径从42.49 μm减小至26.63 μm,二次枝晶臂间距从22.38 μm减小至13.60 μm,抗拉强度从166.1 MPa增加到185.3 MPa,延伸率从3.6%提高至7.6%,断裂方式也从脆性断裂转变为韧脆型断裂。探讨了Sr和Y复合添加时的细化机理和变质机理,得出α-Al晶粒细化的主要原因是α-Al以Al3Y为基底进行快速非均质形核,变质机理为杂质诱导孪晶并以孪晶凹谷机制进行生长。

    Abstract:

    The effects of Sr and Y addition on the microstructure and mechanical properties of A356 aluminum alloy were studied by metallographic microscope, scanning electron microscope, transmission electron microscope, energy dispersive spectra and mechanical property tests. The results show that the combined addition of Sr and Y can obtain the best microstructure and mechanical properties compared with the separate addition of Sr or Y. The eutectic Si changes completely from flake-like or acicular-like to fibrous shape, the equivalent grain diameter of α-Al decreases from 42.49 μm to 26.63 μm, the secondary dendrite arms spacing (SDAS) decreases from 22.38 μm to 13.60 μm, the tensile strength increases from 166.1 MPa to 185.3 MPa, the elongation increases from 3.6% to 7.6%, and the fracture mode changes from brittle fracture to ductile-brittle fracture. The refinement mechanism and modification mechanism of Sr and Y were discussed. It is concluded that the main reason for α-Al grain refinement is the rapid heterogeneous nucleation of α-Al based on Al3Y, and the modification mechanism is impurity-induced twins which grow in the mechanism of twin plane reentrant edge.

    参考文献
    相似文献
    引证文献
引用本文

张艺杰,杜景红,吉全鑫,孙彦华,冯伟光,包崇军,李玉章,严继康.SrY添加对A356铝合金显微组织和力学性能的影响及机理[J].稀有金属材料与工程,2022,51(10):3588~3595.[Zhang Yijie, Du Jinghong, Ji Quanxin, Sun Yanhua, Feng Weiguang, Bao Chongjun, Li Yuzhang, Yan Jikang. Effect of Sr and Y Addition on Microstructure and Mechanical Properties of A356 Aluminum Alloy and Its Mechanism[J]. Rare Metal Materials and Engineering,2022,51(10):3588~3595.]
DOI:10.12442/j. issn.1002-185X.20210938

复制
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2021-10-28
  • 最后修改日期:2022-02-21
  • 录用日期:2022-02-28
  • 在线发布日期: 2022-10-31
  • 出版日期: 2022-10-28