Abstract
The effect of Ti and Sr on the microstructure and mechanical properties of Al-Si-Cu-Ni alloy was studied. Research showd that the addition of 0.1% Ti and 0.02% Sr significantly reduced grain size and changed the morphology of eutectic Si. Sr promoted the formation of stacking faults and nano-Al2Cu. The strength and plasticity were significantly increased with ultimate tensile strength, yield strength and elongation being 239.6 MPa, 140.6 MPa, and 2.11%, respectively.
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