Title: Relationship between the quench delay time and tensile properties for various section thicknesses of AA 7075 Al alloy

Authors: A. Jayanthi; M. Anil Kumar; T. Ram Prabhu

Addresses: HAL (F&F), Bangalore 560093, India ' HAL (F&F), Bangalore 560093, India ' CEMILAC, Defence R&D Organization, Bangalore 560093, India

Abstract: The effects of quench delay time on tensile properties of AA 7075 Al alloy were investigated for various diameters (30, 65, 100, 125 and 165 mm). The bars were kept in air after solution treatment for selected delay time depending on the diameter and were given water quenching and double ageing. Tensile properties and microstructure properties were investigated. The tensile and yield strength properties decrease with increasing the quench delay time and there has been no specific trend observed between the tensile properties and the quench delay time. The drop in the tensile strength may be categorised into three regions: 30-65, 100-125 and 165-200 mm, the strength variation within the region is negligible in contrast to the wide variation observed between the regions, the superimposition of the C curve with the predicted time data explains reasonably the cause of drop in mechanical properties with the diameter.

Keywords: aluminium alloys; quench delay time; heat treatment; tensile properties; microstructure; section thickness.

DOI: 10.1504/IJMMP.2016.079136

International Journal of Microstructure and Materials Properties, 2016 Vol.11 No.3/4, pp.147 - 161

Received: 04 Jun 2015
Accepted: 23 Nov 2015
Published online: 14 Sep 2016 *

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