Acta Metall Sin  1994, Vol. 30 Issue (19): 289-293    DOI:

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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)

WEI Bingbo; WANG Bin(Northwestern Polytechnical University; Hi'an)BARTH M;HERLA CH D M(Institut for Raumsimulation; DLR; Germany). THERMODYNAMIC DRIVING FORCE FOR RAPID CRYSTALLIZATION OF LIQUID METALS. Acta Metall Sin, 1994, 30(19): 289-293.

Abstract References Related Articles Recommended Metrics Download:  PDF(367KB)  Export:  BibTeX | EndNote (RIS)       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      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/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] JIANG He, NAI Qiliang, XU Chao, ZHAO Xiao, YAO Zhihao, DONG Jianxin. Sensitive Temperature and Reason of Rapid Fatigue Crack Propagation in Nickel-Based Superalloy[J]. 金属学报, 2023, 59(9): 1190-1200. 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