Effects of alloying elements on mechanical and thermal characteristics of Al-6wt-%Si-0.4wt-%Mg–(Cu) foundry alloys. Issue 11 (24th July 2019)

• Record Type: Journal Article
• Authors: Choi, Se-Weon; Kim, Yu-Mi; Kim, Young-Chan; Kang, Chang-Seog
• Is Part Of: Materials science and technology. Volume 35:Issue 11(2019)
• Page Start: 1365
• Page End: 1371
• Publication Date: 2019-07-24
• Subjects: Alloying elements -- Al–Si-Mg alloy -- casting -- mechanical property -- thermal conductivity -- heat treatment -- Laser flash method -- precipitation; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2019.1625170
• Languages: English
• ISSNs: 0267-0836

Abstract

ABSTRACT: The objective of this study was to investigate the effects of alloying elements on mechanical and thermal characteristic of Al-6wt-%Si-0.4wt-%Mg–(Cu) foundry alloys after heat treatment using a universal testing machine and a laser flash apparatus. Solid solution treatment of samples was carried out at 535°C for 6 h before quenching samples in warm water. Artificial ageing treatment was conducted at various temperatures ranging from 180 to 220°C for 5 h. When Cu was added to increase the mechanical strength of Al-6wt-%Si-0.4wt-%Mg alloy, its thermal conductivity decreased. After adding 0.1wt-%Ti to an Al-6 wt-%Si-0.4wt-%Mg-0.9wt-%Cu alloy, ultimate tensile strength (UTS) was improved 18 MPa compared to that of Ti-free alloy at ageing temperature of 180°C. The addition of Ti facilitated the formation of θ′-Al2 Cu and Q′-phase, which resulted in increased UTS at room temperature. In the case of Cu-free Al-6wt-%Si-0.4wt-%Mg alloy, adding Ti to the alloy did not affect the UTS.