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Hot hardness and indentation creep study on Al5% Mg alloy matrixB4C particle reinforced composites

Khana, Kirity Bhusan and Kutty, TRG and Surappa, MK (2006) Hot hardness and indentation creep study on Al5% Mg alloy matrixB4C particle reinforced composites. In: Materials Science And Engineering A, 427 (1-2). pp. 76-82.

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Abstract

Al5% Mg matrix composites reinforced with 10 and 20% B4C were prepared by stir casting method. Microhardness of unreinforced alloy and composites were measured using a Nikon hot hardness tester. It was observed that hardness values decrease gradually with increase in temperature. Transition temperature increases marginally from 262 to 274 degrees C due to addition of 20% B4C. Stress exponent for all the materials varies from 4.3 to 4.5 at temperatures in the range 310 and 370 degrees C. Apparent activation energy for creep increases with increase in B4C content. At temperatures below transition temperature, deformation is attributed to the increased interatomic spacing due to increase in temperature and the unpinning of attractive junction between glide and forest dislocations. At temperatures above the transition temperature, deformation is diffusion assisted phenomenon such as dislocation glide and dislocation climb.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsavier.
Keywords: Aluminium matrix composites;Creep of MMCs;Hardness of MMCs.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 30 Mar 2009 04:53
Last Modified: 19 Sep 2010 04:56
URI: http://eprints.iisc.ernet.in/id/eprint/17345

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