金属学报  2011, Vol. 47 Issue (4): 391-396    DOI: 10.3724/SP.J.1037.2010.00605

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深过冷凝固Co80Pd20合金中的枝晶生长

周圣银, 胡锐, 蒋力, 李金山, 寇宏超, 常辉, 周廉

西北工业大学凝固技术国家重点实验室, 西安 710072

DENDRITE GROWTH IN SOLIDIFICATION OF UNDERCOOLED Co80Pd20 ALLOY

ZHOU Shengyin, HU Rui, JIANG Li, LI Jinshan, KOU Hongchao, CHANG Hui, ZHOU Lian

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072

周圣银 胡锐 蒋力 李金山 寇宏超 常辉 周廉. 深过冷凝固Co₈₀Pd₂₀合金中的枝晶生长[J]. 金属学报, 2011, 47(4): 391-396.
, , , , , , . DENDRITE GROWTH IN SOLIDIFICATION OF UNDERCOOLED Co₈₀Pd₂₀ ALLOY[J]. Acta Metall Sin, 2011, 47(4): 391-396.

摘要 参考文献 相关文章 Metrics 全文: PDF(982 KB)   摘要: 采用玻璃熔体净化与循环过热相结合的深过冷凝固技术实现了Co80Pd20合金的深过冷, 获得了高达415 K的最大过冷度. 采用OM观察了不同过冷度下凝固合金的微观组织, 分析了枝晶形成的过冷度区间及过冷度对枝晶形貌的影响. 运用BCT模型对深过冷凝固Co80Pd20中的枝晶生长进行了理论分析, 获得了深过冷凝固过程中的枝晶生长速率、枝晶尖端半径、枝晶尖端溶质浓度及枝晶尖端过冷度组成与过冷度之间的关系, 详尽探讨了过冷熔体中的枝晶生长方式. 借助EDS分析近似测定了凝固过程中枝晶尖端液相溶质浓度, 与BCT模型预测结果符合较好, 表明BCT 模型可成功运用于描述Co80Pd20合金中的枝晶生长. 关键词 ： 深过冷,  快速凝固,  枝晶生长,  溶质截留,  Co80Pd20合金     Abstract：Much interest has been focused on the dendrite growth of undercooled melts in the theoretical field of solidification research. The BCT model was widely accepted to interpret dendrite growth behavior in rapid solidification process. In present case, substantial undercooling ΔT up to 415 K was achieved for Co80Pd20 melt applying molten glass denucleation combined with cyclic superheating. 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 theoretical calculation of the related parameters of the dendrite growth process included tip radius R, dendrite growth velocity V, solute concentration in liquid at dendrite tip CL* and undercooling contributions were completed. It can be found that the dendritic morphology was only formed in the undercooling ranges of 0-72 K and 95-142 K. With the initial undercooling increasing, V rises steeply due to the increase of the growth driving force, but R displays a complicated variation attributed to the combine effects of thermal/solute diffusion. EDS analysis reveals that the experimental data of CL* is in accordance with the theoretical predication by BCT model. The results confirmed that the dendrite growth in undercooled Co80Pd20 melts can be interpreted successfully by BCT model. Key words： undercooled    rapid solidification    dendrite growth    solute trapping    Co80Pd20 alloy 收稿日期: 2010-11-11      ZTFLH:  TG111.4   基金资助: 国家重点基础研究发展计划项目2011CB610400, 新世纪优秀人才支持计划项目NCET-07-0690以及高等学校学科创新引智计划项目B08040资助 作者简介: 周圣银, 男, 1979年生, 博士生 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 周圣银 胡锐 蒋力 李金山 Hongchao Kou 常辉 周廉 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2010.00605      或      https://www.ams.org.cn/CN/Y2011/V47/I4/391 [1] Becker C A, Olmsted D, Asta M, Hoyt J J, Foiles S M. Phys Rev Lett, 2007; 98: 125701 [2] Dragnevski K, Cochrane R F, Mullis A M. Phys Rev Lett, 2002; 89: 215502 [3] Wang H P, Yao W J, Wei B. Appl Phys Lett, 2006; 89: 201905 [4] Laxmanan V. Phys Rev, 1998; 57E: 2004 [5] Bisang U, Bilgram J H. Phys Rev, 1996; 54E: 5309 [6] Zang D Y, Wang H P, Wei B B. Acta Phys Sin, 2007; 56: 4804 (臧渡洋, 王海鹏, 魏炳波. 物理学报, 2007; 56: 4804) [7] Yao W J, Wei B B. Sci China, 2004; 34E: 1 (姚文静, 魏炳波. 中国科学, 2004; 34E: 1) [8] Lipton J, Kurz W, Trivedi R. 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