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Acta Metall Sin  1998, Vol. 34 Issue (6): 586-590    DOI:
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SECONDARY ARM SPACING OF UNDERCOOLED Ni_(50)Cu_(50) ALLOY
LI Jinfu; LU Yili; YANG Gencang; ZHOU Yaohe(State Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi'an 710072)Comspondent: LI Jinfu; associate professor; Fax:(029)8491000 Tel: (029)8492374E-mail: Gencangy nmpu.edu.cn.
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LI Jinfu; LU Yili; YANG Gencang; ZHOU Yaohe(State Key Laboratory of Solidification Processing; Northwestern Polytechnical University; Xi'an 710072)Comspondent: LI Jinfu; associate professor; Fax:(029)8491000 Tel: (029)8492374E-mail: Gencangy nmpu.edu.cn.. SECONDARY ARM SPACING OF UNDERCOOLED Ni_(50)Cu_(50) ALLOY. Acta Metall Sin, 1998, 34(6): 586-590.

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Abstract  The secondary arm spacing of undercooled Ni50Cu50 alloy did not decrease withincreasing undercooling in a simple power law, but there was a abnormal protrusion in theirrelationship in the undercooling range of 40 -- 120 K. This phenomenon was first attributedto the increase of primary dendrite tip radius occurring in the transition from solute diffusioncontrolled dendrite growth at low undercoolings to thermally controlled dendrite growth at highundercoolings. The other cause was the substantial sidebranch coarsing induced by the remeltingwhich was extremely serious in the solidification of undercooled melts.
Key words:  Ni-Cu alloy      undercooling      secondary arm spacing     
Received:  18 June 1998     
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