Effect of sub-Zero Treatment on Ageing of Aluminium Composite

Abstract

Abstract-In this study, B4C reinforced 7075 Al composites were fabricated by cold and hot pressing of Al, Cu, Zn and Mg elemental powders. Two different reinforcement rates (10% and 15%) were used for the composites. In order to examine the structural and mechanical properties, different sub-zero and ageing processes were applied to the composites. Sub-zero and stepped ageing treatments were applied after solutionizing at 470 o C for different time periods. It was found that hardness of the composite was substantially increased and micro structure was changed. Findings show that, general strength of the material significantly increased particularly after solutionization process.Index Terms-B4C, aluminium composite, sub-zero treatment, ageing.

Correlation between Microstructural Alteration, Mechanical Properties and Manufacturability after Cryogenic Treatment: A Review

“…An investigation was designed to examine the effects of the amount of particle refinement and different subzero and ageing processes on the hardness of Al7075 [58]. A smaller atomic distance, refined particle shape, and uniform microstructure were observed after treatments.…”