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金属学报  2010, Vol. 46 Issue (9): 1121-1127    DOI: 10.3724/SP.J.1037.2010.00207
  论文 本期目录 | 过刊浏览 |
二次挤压对SiCp/2009Al复合材料微观结构和力学性能的影响
刘振宇, 王全兆, 肖伯律, 马宗义,  刘\越
中国科学院金属研究所, 沈阳 110016
EFFECTS OF DOUBLE EXTRUSION ON THE MICROSTRUCTURE AND TENSILE PROPERTY OF THE PM PROCESSED SiCp/2009Al COMPOSITES
LIU Zhenyu, WANG Quanzhao, XIAO Bolv, MA Zongyi, LIU Yue
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
全文: PDF(815 KB)  
摘要: 

对粉末冶金法制备的20%SiCp/2009Al(体积分数)复合材料进行了一次挤压和二次挤压, 对2种挤压棒材微观结构的观察表明, 相对于热压复合材料, 挤压可以减少SiCp团聚; 而二次挤压可进一步细化 SiCp, 使SiCp沿挤压方向定向分布, 增大SiCp的长径比, 但对基体合金晶粒尺寸和<111>织构影响不大. 此外, 二次挤压使SiCp沿挤压方向的平均间距进一步增大, 更易于产生近似垂直于挤压方向的贫SiCp层, 导致复合材料屈服和抗拉强度下降而延伸率增加.

关键词 粉末冶金复合材料 铝合金二次挤压贫SiCp    
Abstract

Powder metallurgy (PM), as an important method of fabricating SiC particle reinforced aluminum matrix (SiCp/Al) composites, has advantages in obtaining good interfacial bonding and enhancing tensile strength over casting or infiltrating method. The primary process of the PM method involves mixing, compaction and subsequent secondary plastic deformation. Especially, secondary plastic deformation is an important process to destroy the oxidation film on the Al particle surfaces and enhance Al-SiC bonding. However, the incorporation of the SiC particles restricts plastic flow ability of the composite and makes it difficult to be subjected to heavy single-step plastic deformation, such as single hot extrusion, hot rolling or hot forging. Instead, multi-step deformation is a critical processing approach for the SiCp/Al composites with low deformability. However, the previous attentions were mostly focused on single-step processing, multi--step plastic deformation of the SiCp/Al composites was seldom discussed. In this paper, 20%SiCp/2009Al (volume fraction) composite was fabricated using a common PM method and the effects of double extrusion on the microstructure and tensile property of the composite were investigated. It is indicated that the double extrusion could refine the SiCp size, align the SiCp and increase the aspect ratio of the SiCp, but did not exert critical effects of the grain size and <111> texture of the matrix. However, the average distance between the SiCp along the extrusion direction increased after the double extrusion, more easily inducing a SiCp-poor band which aligned approximately perpendicularly to the extrusion direction. This resulted in a decrease in the strength and an increase in the elongation along the extrusion direction.

Key wordspowder metallurgy    composite    aluminum alloy    double extrusion    SiCp-poor band
收稿日期: 2010-04-30      出版日期: 2010-09-11
ZTFLH:  TF124  
通讯作者: 肖伯律     E-mail: yliu@imr.ac.cn
Corresponding author: XIAO Bolv     E-mail: yliu@imr.ac.cn
作者简介: 刘振宇, 男, 1985年生, 硕士生

引用本文:

刘振宇 王全兆 肖伯律 马宗义 刘\越. 二次挤压对SiCp/2009Al复合材料微观结构和力学性能的影响[J]. 金属学报, 2010, 46(9): 1121-1127.
LIU Zhenyu, WANG Quanzhao, XIAO Bolv, MA Zongyi, LIU Yue. EFFECTS OF DOUBLE EXTRUSION ON THE MICROSTRUCTURE AND TENSILE PROPERTY OF THE PM PROCESSED SiCp/2009Al COMPOSITES. Acta Metall Sin, 2010, 46(9): 1121-1127.

链接本文:

http://www.ams.org.cn/CN/10.3724/SP.J.1037.2010.00207      或      http://www.ams.org.cn/CN/Y2010/V46/I9/1121

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