Elevated-temperature strengthening in carbide (Al4C3)-dispersed aluminium

The effect of strain rate on the compressive flow behaviour of DISPAL 2 is investigated in the temperature range 473-823K. The stress exponent, n, was 28 in the temperature range 473-623K, while it increased to 59 above 673K. The activation volume and energy for deformation were 70 b exp 3 and 100-2...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials science 1993-10, Vol.28 (20), p.5654-5657
Main Authors: GURJAR, M. V, MURTY, G. S, UPDAHYAYA, G. S
Format: Article
Language:English
Subjects:
Applied sciences
Elasticity. Plasticity
Exact sciences and technology
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The effect of strain rate on the compressive flow behaviour of DISPAL 2 is investigated in the temperature range 473-823K. The stress exponent, n, was 28 in the temperature range 473-623K, while it increased to 59 above 673K. The activation volume and energy for deformation were 70 b exp 3 and 100-200 kJ mol exp --1 , respectively, in the temperature range 473-623K. In the higher range, 673-823K, the observed activation volume of 300-500 b exp 3 and the activation energy of approx 1086 kJ mol exp --1 cannot be reconciled with any of the deformation mechanisms. A new model-based creep equation for dispersion-strengthened materials proposed by Rosler and Arzt has been applied to the flow data from 673-823K. Its predictions are in agreement with the experimental data in the temperature range 673-723K. The predictions of the model, however, differ from the experimental data at 773 and 823K.
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00367842