Investigation on high-temperature mechanical properties of Al–7Si–0.6Mg alloy by wire + arc additive manufacturing

Abstract

The room temperature and high temperature tensile properties of Al–7Si–0.6Mg alloy prepared by wire arc additive manufacturing have been investigated. The results show that the strengthening phase gradually coarsens and the eutectic silicon phase does not grow and agglomerate, meanwhile, the tensile strength and yield strength of the alloy gradually decrease with the increase of temperature. The high-temperature properties of the alloy are better than that of cast alloy. With the increase of temperature, the fracture of the alloy changes from ductile transgranular fracture to intergranular fracture.

KEYWORDS:

• WAAM
• wire arc additive manufacturing
• high temperature properties
• Al–7Si–0.6Si alloy

Acknowledgement

It is a pleasure to thank North East Industrial Materials & Metallurgy Co., Ltd (NEIMM) for providing Al–7Si–0.6Mg welding wires and Inner Mongolia Metal Material Research Institute for providing test support. The authors thank for the financial support from National Key R&D Program of china (Item No: 2018YFB1106300-5).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors thank for the financial support from National Key R&D Program of China [Item No: 2018YFB1106300-5].