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何文,杨伟,余欢.铜模喷铸Cu-Zr合金非平衡凝固组织演变行为[J].稀有金属材料与工程(英文),2018,47(9):2693~2698.[He Wen,Yang Wei and Yu Huan.Microstructure evolution of non-equilibrium solidified Cu-Zr alloy by spray casting[J].Rare Metal Materials and Engineering,2018,47(9):2693~2698.]
Microstructure evolution of non-equilibrium solidified Cu-Zr alloy by spray casting
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Received:August 03, 2017  Revised:September 10, 2017
Key words: Cu-Zr alloy, non-equilibrium solidification, phase structure, peritectic transformation, eutectoid transformation
Foundation item:国家自然科学基金(51461023),江西省教育厅资助项目(GJJ14504),江西省金属材料微结构调控重点实验室开放基金(JW201523005)
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He Wen,Yang Wei and Yu Huan  
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      Non-equilibrium solidified Cu100-xZrx(x=5, 30, 50) alloys with different compositions were prepared by vacuum induction melting and spray casting method. The microstructure evolution including grain morphology, element distribution and phase components of non-equilibrium solidified alloy was presented by optical microscope, scanning electron microscope, energy spectrum analysis and X ray diffraction technique. The solidification process of the alloys was studied by differential scanning calorimetry. The results show that the volume fraction of primary phase increases continuously with the increase of Zr content and reveals a transition from non-faceted to faceted and finally non-faceted phase. Affected by the fast cooling effect of copper mould, both the peritectic transformation in Cu70Zr30 alloy and eutectoid transformation in Cu50Zr50 alloy are suppressed, which are further verified by the thermal analysis curve under slow cooling condition. Consequently, the formation regularity of non-equilibrium microstructure of spray casted Cu-Zr alloy can be well explained.