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Interfacial Reactions between the Aluminium Alloy Matrix and Intermetallic Reinforcement Particles in Novel P/M 5056/Ni3Alp Composites

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Published/Copyright: January 8, 2022

Abstract

Interfacial reactions were investigated for a novel P/M (powder metallurgy) 5056 aluminium alloy metal matrix composite reinforced with particulate intermetallic Ni3Al. Composites were fabricated by extrusion of a blend of matrix alloy powder and intermetallic particles produced by self-propagating high temperature synthesis. Extrusion of 5056/15 vol.% Ni3Al at 400 °C produced bars of excellent quality, whereas extrusion of 5056/15 vol.% Ni3Al at 420 °C and of 5056/25 vol.% Ni3Al at 380 °C resulted in severe interfacial reactions and volume expansion during extrusion. The same reactions occurred in the good quality composite during subsequent heat treatment at 500 and 520 °C. The 5056 Al alloy with its high (~5 %) Mg content exhibited a higher reactivity with Ni3Al than Al alloys with low Mg content. The interfacial reaction products were identified to be Al3Ni and Al3Ni2. The interfacial reactions consumed Al so raising the Mg content of the residual matrix. This gave the possibility for the matrix to become partially molten at lower temperatures than expected from its nominal composition. Segregation of Mg near the reinforcement particles is accelerated by the presence of a high dislocation density in the matrix generated during extrusion.


Prof. H. Jones Dept. of Engineering Materials Sir Robert Hatfield Building Mappin Street Sheffield S1 3JD, UK Fax: +44 114 222 5943

  1. Financial contribution of the European Commission (project “COSTE-MAT”, BE 97–4445) is gratefully acknowledged.

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Received: 2001-03-05
Published Online: 2022-01-08

© 2001 Carl Hanser Verlag, München

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