Influence of extrusion temperature on the microstructure and the texture of 6061Al-15 vol. % SICwPM composites

被引:73
作者
Borrego, A [1 ]
Fernández, R [1 ]
Cristina, MD [1 ]
Ibáñez, J [1 ]
González-Doncel, G [1 ]
机构
[1] CSIC, Ctr Nacl Invest Met, Dept Phys Met, E-28040 Madrid, Spain
关键词
microstructure; extrusion; aluminum matrix composites;
D O I
10.1016/S0266-3538(02)00043-X
中图分类号
TB33 [复合材料];
学科分类号
摘要
A systematic study of the microstructure and the texture of powder metallurgy, PM, 6061Al metal matrix composites, MMCs, as influenced by the extrusion temperature, has been conducted. For this purpose, a containerless PM route has been developed to controlling the parameters involved during processing of materials. A strong fiber texture with two components: <111> and <100>, (with the fiber axis parallel to the long extrusion direction) is developed in the matrix of all materials. A limited particle stimulated nucleation process, PSN, occurs during extrusion of the composites when the extrusion temperature, T-extr, is low. The SiC in the composites is divided in two populations; whiskers oriented with the extrusion axis (oriented whiskers) and randomly oriented whiskers (random whiskers) plus particles. Whereas the average whisker length does not change significantly with T-extr, the "degree" of alignment of oriented whiskers (which follows a Gaussian distribution function) is clearly accentuated in the composites extruded at high T-extr with respect the composites extruded at low T-extr. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:731 / 742
页数:12
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