Microstructure and fracture behavior of Al‐Si‐Mg alloy prepared with recycled alloy

Abstract

In this paper, microstructure and fracture behavior of Al‐Si‐Mg alloy prepared with recycled alloy were studied. The results show that some casting defects such as oxidation slags, pores and iron‐rich intermetallic phases exist in the alloy prepared with recycled alloy. Stress concentration forms in the tips of the pores and iron‐rich intermetallic phases in the process of stretching. Cracks are easy to initiate near slags due to the weakening of the adhesion between the oxidized slag and the aluminum matrix. In addition, silicon phases play a hindering role on the movement of dislocations in the process of crack propagation and merging of cracks which is strengthening the alloy prepared with recycled alloy to some extent. Crack propagation is mainly along the direction of casting defects, and the cracks connect with each other until failure of material. Moreover, the crack originate from silicon phase and extend along the eutectic structure of alloy no‐containing recycled alloy, and a large plastic deformation occurred in the α‐aluminum dendrites.

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

“…These morphological changes can be caused by the fast diffusion rate of Si atom in Al matrix at high temperatures. This morphological evolution is also reported by the recent references [4,42].…”

Influence of Modification on Flow Stress Behavior and Corrosive Properties of a Hypoeutectic Al-Si Alloy

“…Several routes, such as chemical modification, solution heat treatment, and deformation, have been used to attain a fine ideal microstructure and to modify the morphology of the Si particles [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. The chemical modification and heat treatment methods are constrained by economy, resources, and environment.…”