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Indexed by:期刊论文

Date of Publication:2011-04-01

Journal:7th China-Japan Bilateral Symposium on High Temperature Strength of Materials

Included Journals:SCIE、EI、CPCI-S、Scopus

Volume:24

Issue:2

Page Number:118-124

ISSN No.:1006-7191

Key Words:Al/Al-Cu graded material; Solution treatment; Artificial aging; Mechanical properties

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 degrees C 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 degrees C for 15 h, the majority of flake shaped precipitates theta '' 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.