Journal
POWDER TECHNOLOGY
Volume 176, Issue 2-3, Pages 66-71Publisher
ELSEVIER
DOI: 10.1016/j.powtec.2007.02.008
Keywords
SiC powders; particle size distribution; metal matrix composites (MMCs); liquid metal infiltration; fracture toughness; hardness; work-hardening
Categories
Ask authors/readers for more resources
The effect of particle size distribution on the superficial hardness of Al/SiCp composites prepared by pressureless infiltration, as well as on the microhardness and fracture toughness (K-IC) of particulate silicon carbide (SiCp) was investigated. Preforms with 0.6 volume fraction of SiC powders (10, 68 and 140 gm) with monomodal, bimodal and trimodal distribution were infiltrated with the alloy Al-15.52 Mg-13.62 Si (wt.%) in argon followed by nitrogen at 1100 degrees C for 60 min. Results show that density behaves linearly with increase in particle-size-distribution whilst superficial hardness, microhardness and fracture toughness exhibit all a parabolic behavior. Superficial hardness behavior can be explained by the combined effect of work-hardening in the alloy matrix and particle-to-particle impingement. Due to the highly covalent nature of SiC, the parabolic response shown by microhardness and KIC cannot be attributed to a dislocation mechanism as in strain-hardening. (c) 2007 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available