Journal
ENGINEERING FRACTURE MECHANICS
Volume 75, Issue 14, Pages 4200-4216Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2008.04.004
Keywords
A356 Al alloy; eutectic Si particle; fracture toughness; microfracture process
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Correlation of microstructure with mechanical properties and fracture toughness of three cast A356 aluminum alloys fabricated by low-pressure-casting, rheo-casting, and casting-forging was investigated in this study. Microfracture observation results showed that eutectic Si particles were cracked first, but that the aluminum matrix played a role in blocking crack propagation. Tensile properties and fracture toughness of the cast-forged alloy were superior to those of the low-pressure-cast or rheo-cast alloy. These results were interpreted by a simple fracture initiation model based on the basic assumption that crack extension initiated at a certain critical strain developed over some microstructurally significant distance. (c) 2008 Elsevier Ltd. All rights reserved.
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