Rapid solidification of Al-Cu-Ag ternary alloy under the free fall condition |
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Authors: | FuPing Dai and BingBo Wei |
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Affiliation: | (1) Department of Applied Physics, Northwestern Polytechnical University, Xi’an, 710072, China |
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Abstract: | The rapid solidification of Al-30%Cu-18%Ag ternary alloy is investigated by using the free fall method. Its solidified microstructure is composed of θ(Al2Cu), α(Al) and ξ(Ag2Al) phases. The liquidus temperature and solidus temperature are determined as 778 and 827 K, respectively. The alloy melt undercooled amounts up to ΔT Max=171 K (0.20T L). Its microstructural evolution is investigated based on the theoretical analysis of undercooling behavior and nucleation mechanics. It is found that the undercooling increases with the decrease of the diameter of the alloy droplet. When ΔT<78 K, the primary θ(Al2Cu) phase of the alloy grows into coarse dendrite. When 78 K⩽ΔT⩽171 K, its refined θ(Al2Cu) phase grows alternatively with α(Al) phase. Once ΔT⩾171 K, its microstructure is characterized by the anomalous (θ+α+ξ) ternary eutectic. Supported by the National Natural Science Foundation of China (Grant Nos. 50121101 and 50395105) |
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Keywords: | Al-Cu-Ag free fall nucleation ternary eutectic rapid solidification high undercooling |
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