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

Autor:	Kahtan S. Mohammad, Azmi Rahmat, Khairul R. Ahmad, Haider T. Naeem
Rok vydání:	2014
Předmět:	Materials science Alloy Metallurgy Treatment process General Engineering chemistry.chemical_element engineering.material Microstructure Precipitation hardening chemistry Aluminium visual_art Vickers hardness test Ultimate tensile strength engineering Aluminium alloy visual_art.visual_art_medium
Zdroj:	Advanced Materials Research. 925:258-262
ISSN:	1662-8985
DOI:	10.4028/www.scientific.net/amr.925.258
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c2c36e5224098e3a853a145b19ffe174 https://doi.org/10.4028/www.scientific.net/amr.925.258 Zobrazit plný text záznamu