简介概要

Effect of heat-treatment on microstructure and properties of SiC particulate-reinforced aluminum matrix composite

来源期刊:中国有色金属学报(英文版)2007年增刊第1期

论文作者:孙有平 严红革 陈振华 张昊

文章页码:318 - 321

Key words:aluminum matrix composite; spray deposition; heat-treatment; fracture morphology

Abstract: The effects of solid solution and aging processing on the microstructures and mechanical properties of the multi-layer spray co-deposited 7090Al/SiCp composite were investigated. The experimented results show that fine grains and homogeneous microstructures can be obtained, the average grain size of the as-solid solution treated and as-aged composites after extrusion is under 3.0 μm. A large amount of the Cu-rich phase particles form in the as-extruded samples, and solve into the matrix after solid solution treatment. After aging, the size of the precipitate phases, mainly MgZn2 and CuAl2 is less than 1.0 μm, which homogeneously distribute inside the grains and at the grain boundaries. The ultimate tensile strength of the composite treated at T6 state, i.e. solid solution treated at 475 ℃ for 1 h then aged at 120 ℃ for 24 h, is up to 765 MPa.

基金信息:the Key Laboratory Open Foundation of Hunan Province, China



详情信息展示

Effect of heat-treatment on microstructure and properties of SiC particulate-reinforced aluminum matrix composite

SUN You-ping(孙有平), YAN Hong-ge(严红革), CHEN Zhen-hua(陈振华), ZHANG Hao(张昊)

College of Materials Science and Engineering, Hunan University, Changsha 410082, China

Received 15 July 2007; accepted 10 September 2007

                                                                                                                                                                            

Abstract: The effects of solid solution and aging processing on the microstructures and mechanical properties of the multi-layer spray co-deposited 7090Al/SiCp composite were investigated. The experimented results show that fine grains and homogeneous microstructures can be obtained, the average grain size of the as-solid solution treated and as-aged composites after extrusion is under 3.0 μm. A large amount of the Cu-rich phase particles form in the as-extruded samples, and solve into the matrix after solid solution treatment. After aging, the size of the precipitate phases, mainly MgZn2 and CuAl2 is less than 1.0 μm, which homogeneously distribute inside the grains and at the grain boundaries. The ultimate tensile strength of the composite treated at T6 state, i.e. solid solution treated at 475 ℃ for 1 h then aged at 120 ℃ for 24 h, is up to 765 MPa.

Key words: aluminum matrix composite; spray deposition; heat-treatment; fracture morphology

                                                                                                                                                                            

1 Introduction

Particulate reinforced aluminum alloy matrix composites have received attention over many years due to their excellent yield and tensile strengths, high specific elastic modulus and isotropic properties compared with the conventional alloy materials, which makes them the good candidate materials for structural applications in the fields of aerospace, automotive, electronics industry[1-3]. During the last decade, considerable efforts have been made to improve the strength of precipitation hardening aluminum alloy matrix composites, such as developing new preparation technologies or suitable heat-treatments.

It has been shown that spray co-deposition technique is one of the most effective methods for preparation of ceramic particulate reinforced metal matrix composite(MMCp)[4-5]. In this work, 7090Al/ SiCp composite was prepared by the spray deposition technique, extrusion deformation and different heat treatments processing were applied to improve the strength, the influence of which on the microstructures and mechanical properties of the composites were investigated.

2 Experimental

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