中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 23 No. 1 January 2013 |
（1. Department of Mechanical Engineering, PES Institute of Technology, Bangalore 560085, India;
2. Visiting Professor, School of Design, Engineering and Computing, Bournemouth University, United K）
Abstract:Studies on texture and microstructure evolution in hot extruded Al 6061 aluminium alloy reinforced with uncoated and nickel coated SiCp were carried out by electron backscattered diffraction technique. Textures of both the alloy and its composite with nickel coated SiCp do exhibit strong β fiber with its axis parallel to the direction of extrusion. In addition to the dominant cube texture (001)á100?, fully recrystallized grains with partially equiaxed structure have been observed in the alloy reinforced with uncoated SiCp. The recrystallization texture of this composite can be attributed to the particle stimulated nucleation (PSN) due to the presence of SiCp with size less than 5 μm. Under these conditions, the low value of Zener–Hollomon, Z (~ 1012 s-1) confirms that PSN is one of the dominant mechanisms for recrystallization and is governed by formation of deformation zone rather than stored energy.
Key words: metal matrix composites; 6061/SiCp composite; extrusion; particle stimulated nucleation; recrystallization; stored energy
