Acta Metall Sin  1996, Vol. 32 Issue (4): 357-362    DOI:

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HYPERCOOLING AND THERMODYNAMIC PROPERTIES OF LIQUID Ni-Fe ALLOYS

WEI Bingbo; DONG Changxing(Northwestern Polytechnical University; Xi'an 710072)(Manuscript received 1995-09-25)

WEI Bingbo; DONG Changxing(Northwestern Polytechnical University; Xi'an 710072)(Manuscript received 1995-09-25). HYPERCOOLING AND THERMODYNAMIC PROPERTIES OF LIQUID Ni-Fe ALLOYS. Acta Metall Sin, 1996, 32(4): 357-362.

Abstract References Related Articles Recommended Metrics Download:  PDF(464KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Ni-10% Fe and Ni-35% Fe alloy melts were undercooled with glass fluxing technique by 371 (0. 90 △T_h) and 343 K (0. 91 △T_h) .Their hypercooling limits △T_h were determined to be 413 and 376 K respectively. A new method to measure the integral mean specific heat C_(pL) of undercooled metallic melts was developed according to the definition of hypercooling. That is, one can take C_(pL) as the ratio of latent heat of fusion △H_m to hypercooling limit △T_h, provided that the latter two physical parameters have been obtained through experiments. The C_(pL) values of the above Ni-Fe alloys were found to be 41. 0 and 40. 7 J/ (mol . K). Theoretical calculations were also carried out to reveal the relationships of enthalpy change △H_(LS), entropy change △S_(LS), Gibbs free energy change △G_(LS) and crystal nucleation rate I during rapid solidification vs undercooling. Although the maximum undercoolings achieved by both Ni-Fe alloys have exceeded the critical level of 0-2 T_L, the calculated results indicate that heterogeneous nucleation must have taken place in preference to homogeneous nucleation. Those heterogeneous nucleants with a wetting angle range of 53°< θ< 80°played the dominating role to prevent Ni-Fe alloys from further approaching their hypercooling limits. Correspondent: WEI Bingbo, professor, (Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072) Key words:  liquid metal      hypercooling      undercooling      thermodynamic property      Ni-Fe alloy      Received:  18 April 1996      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/Y1996/V32/I4/357 1SahmPR,KellerMH,SchieweB．ResearchProgramof theGermanSpacelabMissionD-2．2nded,Kln,Germany:WissenschaftlicheProjecktfhrung//DLR,1993:3632EvansND,HofmeisterWH,BayuzickRJ,RobinsonMB．MetallTrans,1986;17A:9733WeiB,HerlachDM,FeuerbacherB,SommerF．ActaMetallMater,1993;41:18014GomersallDW,ShiraishiSY,WardRG．JAustInstMet,1965;10:2205WillneckerR,HerlachDM,FeuerbacherB．ApplPhysLett,1986;49:13396HofmeisterWH,RobinsonMB,BayuzickRJ．MaterResSocSympProc,1987;87:1497魏炳波,杨根仓,周尧和.金属学报,1990;26:B3438TurnbullD,JChemPhys,1952;20:4119魏炳波,王彬,BarthM,HerlachDM．金属学报,1994;30:B289 [1] WU Xinqiang, RONG Lijian, TAN Jibo, CHEN Shenghu, HU Xiaofeng, ZHANG Yangpeng, ZHANG Ziyu. 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