深过冷凝固Co80Pd20合金中的枝晶生长.pdf

47 4 2011 4 391—396 ACTA METALLURGICA SINICA Apr. 2011 –396 Co 80 Pd 20 ?( , 710072) Co 80 Pd 20 , 415 K . OM , . BCT Co 80 Pd 20 , , . EDS , BCT , BCT Co 80 Pd 20 . , , , ,Co 80 Pd 20 A 0412 ?1961(2011)04 ? 0391 ? 06 DENDRITE GROWTH IN SOLIDIFICATION OF UNDERCOOLED Co 80 Pd 20 ALLOY ZHOU Shengyin, HU Rui, JIANG Li, LI Jin shan, KOU Hongchao, CHANG Hui, ZHOU Lian State Key Laboratory of Solidi?cation Processing, Northwestern Polytechnical University, Xi’an 710072 Correspondent: HU Rui, professor, Tel: (029)88491764 , E-mail: ******@nwpu. Supported by National Basic Research Program of China (No. 2011CB610400 ), Program for New Century Excellent Talents in University (No. NCET–07–0690 )andthe 111 Project (No. B08040 ) Manuscript received 2010–11–11, in revised form 2010–12–20 ABSTRACT Much interest has been focused on the dendrite growth of undercooled melts in the theoretical ?eld of solid i?cation research. The BCT model was w idely accepted to interpret dendrite growth behavior in rapid solidi?cation process. In present case, substantial undercooling ? T up to 415 K was achieved for Co 80 Pd 20 melt applying molten glass bined with cyclic super- heating. The dendritic morphology of the experimental alloy was investigated by OM and the solute concentration of appointed micro–area was analyzed by EDS. Based on the BCT dendrite growth model, the theoretic