Effects of Extruding Casting on SiC<sub>p</sub> Reinforced 7090 Aluminum Matrix Composites

Sun Youping; Yan Hongge; Chen Zhenhua; Chen Gang

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Effects of Extruding Casting on SiC_p Reinforced 7090 Aluminum Matrix Composites
Issue 1, Pages: 1-3(2008)
Published： 2008 ，
DOI：

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[1]孙有平,严红革,陈振华,陈刚.楔压加工对SiC_p/7090铝基复合材料的影响[J].特种铸造及有色合金,2008(01):1-3+5.

Sun Youping, Yan Hongge, Chen Zhenhua, et al. Effects of Extruding Casting on SiC_p Reinforced 7090 Aluminum Matrix Composites. [J]. Special Casting & Nonferrous Alloys (1):1-3(2008)
[1]孙有平,严红革,陈振华,陈刚.楔压加工对SiC_p/7090铝基复合材料的影响[J].特种铸造及有色合金,2008(01):1-3+5. DOI：

Sun Youping, Yan Hongge, Chen Zhenhua, et al. Effects of Extruding Casting on SiC_p Reinforced 7090 Aluminum Matrix Composites. [J]. Special Casting & Nonferrous Alloys (1):1-3(2008) DOI：

摘要

采用一种新型的楔压工艺对大尺寸多层喷射共沉积SiCp/7090复合材料进行致密化加工

研究了楔压加工对多层喷射沉积工艺制备的SiCp/7090复合材料组织及性能以及沉积坯与挤压坯密度的影响规律。研究表明

楔压过程中

在大的静水压力以及剪切应力的共同作用下

复合材料中孔洞被逐渐拉长闭合

致密化效果良好

压制后

SiC颗粒被明显破碎

其分布得到改善。致密化后的材料经过热处理后其横向强度σb达到540MPa

压向强度σb达到325MPa。

Abstract

The densification of multi-layer co-deposited large dimensional 7090/SiC

composites was performed by extruding casting.The effects of extruding process on the microstructure and properties of the composites and on the densities of as-deposited and as-extruded composites were described.The results reveal that pores in the composites are elongated to gradually close as a result of co-action of heavy hydrostatic pressure and shearing stress during extruding process

taking a positive densification effect.The distribution of SiC particles in the extruded composites was obviously improved due to its broken during extruding process.And the tensile strength of as-extruded composites is 540 MPa in transverse direction and is 325 MPa in longitude direction after heat treatment.