Effects of Nitrogen and Vacuum Atmospheres and Addition of Tin on the Densification of Al-Cu-Mg pre-alloyed Powder During Supersolidus Liquid-Phase Sintering

مهندسی متالورژی و مواد

Article 6, Volume 22, Issue 2 - Serial Number 4, January 2012   

Document Type: Original Articles

DOI: 10.22067/ma.v22i2.10909

Authors

hosin Momeni^* ; S. hosin Razavi; said Shabestari

Abstract

In this research, supersolidus liquid-phase sintering of aluminum alloy 2024 in pre-alloyed condition was investigated. Differential thermal analysis (DTA) and thermal gravimetric analysis (TGA) were carried in nitrogen and vacuum atmospheres. The densification process was improved within the nitrogen atmosphere due to the formation of aluminum nitride (AlN). The maximum density was achieved at 610 ºC in nitrogen atmosphere. This process led to produce samples with a relative density of 98.8%. The relative densities after sintering increased to the maximum value of 99.3% with the addition of 0.1 wt.% Sn. The results showed 5.2 and 4.4% increase in the hardness and bending strength, respectively, with the addition of 0.1 wt.% Sn.