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Evolution of the Retrogression and Reaging Treatment on Microstructure and Properties of Aluminum Alloy (Al-Zn-Mg-Cu)

Year: 2014

Type: article

Abstract: In this study the evolution of the retrogression and reaging (RRA) heat treatment process on microstructure and mechanical properties of AA 7075 Al-alloys which produced by semi-direct chill (DC) casting process were investigated. Al-Zn-Mg-Cu alloys were homogenized at different heat treatment conditions, aged at 120°C for 24 h (T6), and retrogressed at 180°C for 30 min then re-aged at 120°C for 24 h (RRA). The results showed that this three-step process of the heat treatments, the mechanical properties of alloys was substantially improved. The highest ultimate tensile strength and Vickers hardness attained for the retrogression and re-aging about 530 MPa and 223 HV respectively. The precipitation strengthening is responsible about improve the strength under impact the retrogression and re-aging process.

Source: Advanced materials research

DOI: 10.4028/www.scientific.net/amr.925.258

Authors: Haider T. Naeem, Khairul R. Ahmad, Kahtan S. Mohammad, Azmi Rahmat

Institution: Universiti Malaysia Perlis

Language: English

Topic: Aluminum Alloy Microstructure Properties

Subfield: Metals and Alloys

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Funders: Central University of Finance and Economics, Universiti Malaysia Perlis, Division of Materials Research

OpenAlex ID: W1978127397

FWCI: 0.937

Cites: 6

Cited by: 9

Related to: 10