Microstructural evolution of decagonal quasicrystal in the undercooled Al72Ni12Co16 alloy melts |
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| Authors: | XB Liu JG Li |
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| Institution: | a School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, People’s Republic of China
b State Key Laboratory of Solidification Processing 543, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, People’s Republic of China |
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| Abstract: | The microstructure evolution of decagonal quasicrystals in Al72Ni12Co16 alloy was investigated by the electromagnetic melting and cyclic superheating method. Single-phase decagonal quasicrystals have been obtained when the undercoolings were larger than 60 K. The decagonal quasicrystals formed at various undercoolings show different microstructural morphologies. Furthermore, grain refinement was found near the undercooling of 120 K. Based on current thermodynamic and dendrite growth theories, a dimensionless superheating parameter was adopted to explain the effect of processing conditions on the microstructure of Al72Ni12Co16 alloy. The result indicate that the fine equiaxied microstructure of decagonal quasicrystal (D-phase) formed near on undercooling of 120 K originates from the break-up of dendrites. |
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| Keywords: | Q110 A105 S440 |
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