Affiliation:
1. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
2. Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, Shanghai 200240, China
Abstract
The orientation at the interfaces plays a vital role on the morphology of the aging precipitates in Al–Zr–Y composites. Experimental observation found out that the aging precipitates FCC-Al3(Zr,Y) phase does not have the typical “Al3Y core–Al3Zr shell” structure, which is common for most of the Al–Z–RE (rare earth elements) alloys. First-principles calculations were employed in this paper to reveal the orientations at the Al/Al3(Zr,Y) interface for the development of a new heat resistant Al–Zr–Y alloy. Three interface configurations D019–Al3Y(001)/Al(111), L12–Al3Y(111)/Al(111), and L12–Al3Y(001)/Al(001) were proposed for considerations. The calculations revealed that FCC-Al(001)/FCC-Al3Y(001) is the most stable interface. Zr and Y doping led to lower interface energies. In the early stage of growth, Zr doping dominated the interface energies due to the influence of surface energy. With the increase of the substituted elements content at the interface, the work of adhesion has a more significant effect on the interface energies, and the interface was dominated by Y doping. Therefore, the composite shell is finally formed as the FCC-Al3(Zr,Y) phase rather than the typical “Al3RE core–Al3Zr shell” structure. This result provides a guide for further research studies on the interface performance between Al3(Zr,Y) and Al matrix.
Funder
National Natural Science Foundation of China
Science and Technology Commission of Shanghai Municipality
Subject
General Physics and Astronomy
Cited by
4 articles.
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