Health & Environmental Research Online (HERO)


Print Feedback Export to File
2565344 
Journal Article 
The absence of thermal expansion mismatch strengthening in nanostructured metal-matrix composites 
Vogt, R; Zhang, Z; Li, Y; Bonds, M; Browning, ND; Lavernia, EJ; Schoenung, JM 
2009 
1 
Scripta Materialia
ISSN: 1359-6462 
61 
11 
1052-1055 
WOS:000271179800014 
A bulk particulate reinforced nanostructured metal-matrix composite (MMC) was synthesized via cryomilling and consolidation. The effect of thermal expansion mismatch strain on strengthening was investigated in detail. The results indicate that, unlike in conventional coarse-grained MMCs, thermal expansion mismatch strengthening does not occur. Transmission electron microscopy demonstrates that formation of geometrically necessary dislocations is constrained to a nanostructured interfacial layer with grains similar to 30-50 nm in size, thus limiting strain hardening in the bulk region of the matrix. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. 
Nanostructure; Metal-matrix composites; Powder metallurgy; Residual thermal stress; Particulate reinforced composites