Effect of Er Addition on the High Temperature Strength of Al-Si-Cu-Ni-Mg-Fe Piston Alloys by T5 and T6 Heat Treatment
Journal Title: Materials Science-Medžiagotyra - Year 2019, Vol 25, Issue 4
Abstract
In this study, the dependence of Er addition (0 – 0.49 wt.%) on the microstructural evolution and related tensile strength at high temperature (HT) were investigated for the eutectic Al-Si piston alloys. The results showed there were intermetallic compounds of -Al3CuNi, -Al7Cu4Ni, Al4Cu2Mg8Si7, β-AlFeSi and Al3(Er, Cu, Fe)(Ni, Si)2 identified at T5 states. Herein, the added Er element has led to the formation of the star-like and the irregular-shaped Al3(Er, Cu, Fe)(Ni, Si)2 phase. The phase was stable which showed little change in both size and composition experienced solid solution at HT during the T6 treatment. For the HT strengths (350 °C), the T5 state alloys have higher UTSs than those at T6 state, both of which were reduced gradually with the increasing Er contents. The variation of HT strengths caused by the Er addition was explained by the microstructral evolution, namely Al3(Er, Cu, Fe) (Ni, Si)2 phase formation.
Authors and Affiliations
Xianfeng LI, Cunjuan XIA, Yi WU, Dong CHEN, Mingliang WANG, Naiheng MA, Haowei WANG
Keywords
Related Articles
- EP ID EP674898
- DOI 10.5755/j01.ms.25.4.19453
- Views 58
- Downloads 0
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