Acta Metallurgica Sinica (English Letters) ›› 2011, Vol. 24 ›› Issue (2): 118-124.DOI: 10.11890/1006-7191-112-118

• 研究论文 • 上一篇    下一篇

Influnce of Heat Treatment on Microstructure and Mechanical Properties of Al/Al-Cu Graded Materials

许富民   

  1. 大连理工大学材料学院
  • 收稿日期:2010-12-01 修回日期:2011-02-28 出版日期:2011-04-25 发布日期:2011-04-20
  • 通讯作者: 许富民

Influence of heat treatment on microstructure and mechanical properties of Al/Al-Cu graded materials

Qian CONG, Fumin XU,Yi TAN, Xiaolei SHI, Wei DONG, Jiayan LI, Junshan ZHANG   

  1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
  • Received:2010-12-01 Revised:2011-02-28 Online:2011-04-25 Published:2011-04-20
  • Contact: Fumin XU

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Abstract: Five-layered Al/Al-Cu functionally graded material (FGM) was prepared by powder metallurgy technology, and the subsequent heat treatment was carried out for the graded material. The microstructures and distribution of Cu element under pressure sintering (F), solution treatment (T4) and artificial aging treatment (T6) were investigated, and the Vickers hardness and flexural properties of different states were tested. The results showed that sintered compact with dense structure and compositional continuous change was obtained. The second-phase CuAl2 was dispersively distributed along grain boundary of Al matrix. After solution treatment at 503℃ for 3 h, CuAl2 phase obviously decreased and dissolved into the Al matrix, and the flexural strength was thereupon enhanced to 228.5~MPa. With the subsequent aging treatment at 150℃ for 15 h, the majority of flake shaped precipitates Θ" phases were uniformly distributed in the matrix. And the distribution of Cu element became gradual continuous compared to sintered compact. Meanwhile, the flexural strength increased further, which accompanied with the decline of plasticity.

Key words: Al/Al-Cu graded material, Solution treatment, Artificial aging, Mechanical properties