ACTIVATED SINTERING OF ALUMINIUM-COPPER POWDER-METALLURGICAL, PARTS

Abstract

The present investigation forms a part of long term studies carried out in the department on activated sintering of Aluminium alloys. Ai-3%, 4%, 5% Cu alloy were activated sintered with addition of Boron isothermally at 60000 for different periods in vacuum. in addition the effect of compacting pressure on sintering behaviour of above alloys were also carried out and the optimum compacting pressure was selected for this work on isothermal sintering. It was observed that Boron activates sintering of the compacts such that with increase in Coprer content the densifica-tion parameter and hardness peaks, which is observed during isother.ual sintering, increase in magnitude as well as its posi-tion shifts to the lesser sintering periods. The results have been interpretted on the basis of different extent of liquid phase formed during sintering and its possible effects on the sintering mechanism. `Y