The effect of aging treatment on the microstructure and mechanical properties of AA2124 hybrid composites reinforced with both SiC whiskers and SiC particles
Bc. Ko et Yc. Yoo, The effect of aging treatment on the microstructure and mechanical properties of AA2124 hybrid composites reinforced with both SiC whiskers and SiC particles, COMP SCI T, 59(5), 1999, pp. 775-779
The hybrid composites with different ratios of SiCw and SICp (SiCw:SICp = 1
:1, 1.2, and 1:3) were fabricated by the powder-metallurgy route and were s
olution treated followed by aging treatment. Mechanical properties of the h
ybrid composites reinforced with both SIC whiskers (SiCw) and SIC particles
(SiCp) were investigated. The peak aging time for the hybrid composites wa
s determined from the measurement of matrix hardness. Accelerated aging occ
urred in the hybrid composites and the peak aging time (similar to 5 h) was
similar in all the hybrid composites. The hybrid composite with SICw:SICp
= 1.1 showed the highest ultimate tensile strength. The work hardening rate
of under-aged hybrid composite with SiCw:SiCp = 1.1 was higher than that o
f over-aged one. (C) 1999 Elsevier Science Ltd. All rights reserved.