金属学报  1994, Vol. 30 Issue (19): 289-293

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液态金属快速结晶的热力学驱动力

魏炳波;王彬

西北工业大学

THERMODYNAMIC DRIVING FORCE FOR RAPID CRYSTALLIZATION OF LIQUID METALS

WEI Bingbo; WANG Bin(Northwestern Polytechnical University; Hi'an)BARTH M;HERLA CH D M(Institut for Raumsimulation; DLR; Germany)

魏炳波;王彬. 液态金属快速结晶的热力学驱动力[J]. 金属学报, 1994, 30(19): 289-293.
, . THERMODYNAMIC DRIVING FORCE FOR RAPID CRYSTALLIZATION OF LIQUID METALS[J]. Acta Metall Sin, 1994, 30(19): 289-293.

摘要 参考文献 相关文章 Metrics 全文: PDF(367 KB)   摘要: 采用超高真空无容器悬浮熔炼技术使液态Ｆｅ和Ｎｉ的过冷度分别达２００和２３５Ｋ，借助量热法测定出其比热各为４８．６和４０．５Ｊ·ｍｏｌ~（－１）·Ｋ~（－１）．据此精确计算出深过冷Ｆｅ和Ｎｉ快速结晶的热力学驱动力△Ｇ_（ＬＳ），并与Ｔｕｒｎｂｕｌｌ模型和Ｄｕｂｅｙ－Ｒａｍａｃｈａｎｄｒａｒａｏ模型的近似计算结果相比较，发现这两种近似模型在过冷度超过１００Ｋ时均产生大于１％的偏差．进一步分析发现，△Ｇ_（ＬＳ）的计算偏差对深过冷液态金属中晶体形核率的影响极大，因此快速凝固研究中应尽可能精确计算△Ｇ_（ＬＳ）． 关键词 ： 深过冷,  液态金属,  比热,  晶体形核,  快速凝固,  Ｆｅ,  Ｎｉ     Abstract：The thermodynamic driving force for rapid crystallization of liquid metals, i.e.the Gibbs free energy difference △G_(LS) between undercooled liquid phase and product solid phase, is of essential importance for deepened investigations on rapid solidification such as the calculation of nucleation rate and the prediction of the formability of metastable phases as well as the feasibility of glass transition. An ultra-high-vacuum containerless processing technique by RF electromagnetic levitation melting was applied to undercoolliquid Fe and Ni by amounts up to 200 and 235 K. Specific heats of undercooled liquid Fe and Ni were measured by drop calorimetry and determined as. 48. 6 and 40. 5 J . mol~(-1) . K~(-1) respectively. On the basis of specific heat measurements, the △G_LS values of Fe and Ni were calculated according to its rigorous expression. Meanwhile, the theoretical models by Turnbull and Dubey-Ramachandrarao were also used to calculate the thermodynamic driving force approximately. It was found that Dubey-Ramachandrarao model usually showed smaller deviations but both models deviated significantly from the rigorous calculations provided that the undercooling exceeded 100 K. Since the deviation of approximated △G_(LS) value has a drastic influence on the calculation of nucleation rate in the undercooled liquid metals, it is necessary to do rigorous calculations about the thermodynamic driving force for any quantitative research on rapid crystallization. Key words： undercooling    liquid metals    specific heat    nucleation    rapid solidification Fe    Ni      基金资助:国家自然科学基金;;优秀中青年人才专项基金;;国家教委优秀青年教师基金;;德国洪堡基金 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 魏炳波 王彬 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1994/V30/I19/289 1魏炳波,杨根仓,周尧和．航空学报,1991;12:A2132魏炳波,杨根仓,周尧和．金属学报,1990;26:B3433SommerF．MaterSciEng,1991;A133:4344GillessenF,HerlachDM．JNon-CrystSolids,1990;117//118:5555DubeyKS,RamachandraraoP,LeleS．IntJRapidSolidification,1990;5:2216TurnbullD．JChemPhys,1952;20:4117DubeyKS,RamachandraraoP．ActaMetall,1984;32:918魏炳波,杨根仓．航空学报,1988;9:B5899KurzW,FisherDJ．FundamentalsofSolidification．3rded,Aedermannsdorf,Switzerland:TransTechPublicationsLtd,1989:21110PerepezkoJH,PaikJS．JNon-CrystSolide,1984;61//62:113 [1] 丁桦, 张宇, 蔡明晖, 唐正友. 奥氏体基Fe-Mn-Al-C轻质钢的研究进展[J]. 金属学报, 2023, 59(8): 1027-1041. [2] 常松涛, 张芳, 沙玉辉, 左良. 偏析干预下体心立方金属再结晶织构竞争[J]. 金属学报, 2023, 59(8): 1065-1074. [3] 孙蓉蓉, 姚美意, 王皓瑜, 张文怀, 胡丽娟, 仇云龙, 林晓冬, 谢耀平, 杨健, 董建新, 成国光. Fe22Cr5Al3Mo-xY合金在模拟LOCA下的高温蒸汽氧化行为[J]. 金属学报, 2023, 59(7): 915-925. [4] 李小涵, 曹公望, 郭明晓, 彭云超, 马凯军, 王振尧. 低碳钢Q235、管线钢L415和压力容器钢16MnNi在湛江高湿高辐照海洋工业大气环境下的初期腐蚀行为[J]. 金属学报, 2023, 59(7): 884-892. [5] 张德印, 郝旭, 贾宝瑞, 吴昊阳, 秦明礼, 曲选辉. Y2O3 含量对燃烧合成Fe-Y2O3 纳米复合粉末性能的影响[J]. 金属学报, 2023, 59(6): 757-766. [6] 许林杰, 刘徽, 任玲, 杨柯. Cu对Ni-Ti合金抗支架内再狭窄与耐蚀性能的影响[J]. 金属学报, 2023, 59(4): 577-584. [7] 吴欣强, 戎利建, 谭季波, 陈胜虎, 胡小锋, 张洋鹏, 张兹瑜. 耐Pb-Bi腐蚀Si增强型铁素体/马氏体钢和奥氏体不锈钢的研究进展[J]. 金属学报, 2023, 59(4): 502-512. [8] 李斗, 徐长江, 李旭光, 李双明, 钟宏. La掺杂P型CeyFe3CoSb12 热电材料及涂层的热电性能[J]. 金属学报, 2023, 59(2): 237-247. [9] 张开元, 董文超, 赵栋, 李世键, 陆善平. 固态相变对Fe-Co-Ni超高强度钢长臂梁构件焊接-淬火过程应力和变形的影响[J]. 金属学报, 2023, 59(12): 1633-1643. [10] 姜江, 郝世杰, 姜大强, 郭方敏, 任洋, 崔立山. NiTi-Nb原位复合材料的准线性超弹性变形[J]. 金属学报, 2023, 59(11): 1419-1427. [11] 胡敏, 周生玉, 国京元, 胡明昊, 李冲, 李会军, 王祖敏, 刘永长. 多相Ni3Al基高温合金微区氧化行为[J]. 金属学报, 2023, 59(10): 1346-1354. [12] 杨超, 卢海洲, 马宏伟, 蔡潍锶. 选区激光熔化NiTi形状记忆合金研究进展[J]. 金属学报, 2023, 59(1): 55-74. [13] 陈斐, 邱鹏程, 刘洋, 孙兵兵, 赵海生, 沈强. 原位激光定向能量沉积NiTi形状记忆合金的微观结构和力学性能[J]. 金属学报, 2023, 59(1): 180-190. [14] 梁琛, 王小娟, 王海鹏. 快速凝固Ti-Al-Nb合金B2相形成机制与显微力学性能[J]. 金属学报, 2022, 58(9): 1169-1178. [15] 朱小绘, 刘向兵, 王润中, 李远飞, 刘文庆. 290℃氩离子辐照对Fe-Cu合金微观组织的影响[J]. 金属学报, 2022, 58(7): 905-910. Viewed Full text Abstract Cited   Shared      Discussed