Influence of Cu on modifying the beta phase and enhancing the mechanical properties of recycled Al-Si-Fe cast alloys.

ABSTRACT: High iron impurity affects the castability and the tensile properties of the recycled Al-Si alloys due to the presence of the Fe containing intermetallic β-Al₉Fe₂Si₂ phase. To date only Mn addition is known to transform the β-Al₉Fe₂Si₂ phase in the Al-Si-Fe system. However, for the first time, as reported here, it is shown that β-phase transforms to the ω-Al₇Cu₂Fe phase in the presence of Cu, after solutionization at 793 K. The ω-phase decomposes below 673 K resulting into the formation of θ-Al₂Cu phase. However, the present thermodynamic description of the Al-Si-Fe-Cu system needs finer tuning to accurately predict the stability of the ω-phase in these alloys. In the present study, an attemp

SUBMITTER: Basak CB 

PROVIDER: S-EPMC5516036 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature