Author： Xia X. McQueen H.J.
Publisher： Springer Publishing Company
ISSN： 0929-189X
Source： Applied Composite Materials, Vol.4, Iss.6, 1997-01, pp. : 333-347
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Abstract
Deformation and microstructural behaviours of a 20% (volume percent) particle reinforced 6061 Al matrix composite have been studied by torsion from 25 to 540°C with strain rates of 0.1, 1 and 5 s^-1. The logarithmic stress versus reciprocal temperature relationship exhibits two slopes indicating different deformation mechanisms. The 20%Al_2O_3/6061 Al composite shows a greater hardening behaviour than those of the 10%Al_2O_3/6061 Al composite and of the monolithic alloy. Above 250°C, TEM investigations reveal much smaller subgrain size and higher volume of non-cellular substructures, as well as dynamic recrystallization nuclei in the 20%Al_2O_3/6061 Al composite in comparison to those of the 10%Al_2O_3/6061 Al composite and matrix alloy the same test condition. The torsion fracture surface was studied and compared to the three point bending failure specimens.
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