Yong-Chong Kang , Barton Arkhurst , Sammy Lap Ip Chan
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引用次数: 0
Abstract
The applicability of a nanometric silicon carbide (SiC)-reinforced 7775 aluminium matrix composite (AMC) at elevated temperatures and the underlying creep mechanisms were investigated. AMCs with 1 vol% nanometric and micrometric SiC particles, along with an unreinforced 7775 Al alloy, were studied. Under applied stresses of 42, 32, and 22 MPa at 673, 723, and 773 K, respectively, the nanometric SiC-reinforced AMC exhibited creep resistance nearly two orders of magnitude higher than the unreinforced and micrometric-reinforced AMCs. Microstructural analyses revealed finely dispersed precipitates that grew with increasing creep temperature and fully dissolved at 773 K, leading to rapid creep in the unreinforced and micrometric AMCs. In contrast, the nanometric SiC particles substituted for the precipitates and served as the primary obstacles to creep deformation. The enhanced creep resistance is attributed to a higher threshold stress and strong dislocation–precipitate interactions. This is the first report demonstrating effective creep resistance of a 7775 AMC with a very small volume fraction of nano-reinforcement at a high temperature of 773 K (0.85 of the liquidus temperature).
期刊介绍:
Materials Chemistry and Physics is devoted to short communications, full-length research papers and feature articles on interrelationships among structure, properties, processing and performance of materials. The Editors welcome manuscripts on thin films, surface and interface science, materials degradation and reliability, metallurgy, semiconductors and optoelectronic materials, fine ceramics, magnetics, superconductors, specialty polymers, nano-materials and composite materials.