Title: Microstructure and mechanical properties of hierarchical multi-phase composites based on Al-Ni-type intermetallic compounds in the Al-Ni-Cu-Si alloy system
Abstract: Systematic microstructural investigations of a series of Al81Ni13-xCuxSi6 alloys with x = 0, 3, 5, 8, and 10 at.% revealed that addition of Cu leads to a change of the primary intermetallic compound from Al3Ni to Al3Ni2. Moreover, Cu addition induces a multi-phase composite microstructure consisting of dual primary phases (Al3Ni2 + α-Al) and a eutectic matrix. The eutectic matrix is transformed from (α-Al+Si)eutectic to (α-Al+Al2Cu+Si)eutectic. In course of the microstructural evolution, the mechanical properties are enhanced, and the Al81Ni5Cu8Si6 alloy exhibits optimized room temperature mechanical properties such as an increased yield strength of ∼600 MPa and a remarkably improved fracture strain of ∼15% due to similar lattice parameters and crystal structures of the constituent phases. The large macroscopic plastic strain is attributed to a combination of impeded crack growth and wavy propagation of shear bands in the intermetallic compounds.
Publication Year: 2018
Publication Date: 2018-03-27
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 38
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