Deformation behaviour and microstructure of a 20% Al2O3reinforced 6061 Al composite
- Resource Type
- Article
- Authors
- Xia, Xiaoxin; McQueen, H.
- Source
- Applied Composite Materials; November 1997, Vol. 4 Issue: 6 p333-347, 15p
- Subject
- Language
- ISSN
- 0929189X; 15734897
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% Al2O3/6061 Al composite shows a greater hardening behaviour than those of the 10% Al2O3/6061 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% Al2O3/6061 Al composite in comparison to those of the 10% Al2O3/6061 Al composite and matrix alloy the same test condition. The torsion fracture surface was studied and compared to the three point bending failure specimens.