Metastable phase formation in eutectic solidification of highly undercooled Fe83B17 alloy melt

Abstract Adopting molten glass denucleating combined with thermal cycling, high undercooling up to 460 K was achieved in the bulk Fe83B17 alloy melts. Results from XRD, SAED and DTA show that, for undercoolings beyond the critical value 386 K, a metastable phase Fe3B remains in the as-solidified structure at room temperature. The effect of undercooling on the observed phenomenon was interpreted in terms of a time-dependent nucleation theory, i.e., the competitive nucleation between the metastable phase, Fe3B and the stable phase, Fe2B.

[1]  D. Stephan,et al.  Metastable phase formation in undercooled near-eutectic Nb-Al alloys , 1997 .

[2]  W. Löser,et al.  Solidification kinetics and phase formation of undercooled eutectic Ni-Nb melts , 1999 .

[3]  Xin Lin,et al.  Microstructure evolution and metastable phase formation in undercooled Fe-30 at.% Co melt , 1999 .

[4]  L. Battezzati,et al.  Undercooling of NiB and FeB alloys and their metastable phase diagrams , 1997 .

[5]  R. Abbaschian,et al.  Eutectic solidification processing via bulk melt undercooling , 1997 .

[6]  G. Shao,et al.  Prediction of phase selection in rapid solidification using time dependent nucleation theory , 1994 .

[7]  A. Grosse,et al.  Viscosity and Self-Diffusion of Liquid Thallium from Its Melting Point to About 1300°K. , 1965 .

[8]  P. Turner,et al.  Relativistic Hartree–Fock X‐ray and electron scattering factors , 1968 .

[9]  B. Feuerbacher,et al.  Direct determination of metastable phase diagram by synchrotron radiation experiments on undercooled metallic melts. , 2001, Physical review letters.

[10]  G. Cacciamani,et al.  Driving forces for crystal nucleation in Fe–B liquid and amorphous alloys , 2003 .

[11]  R. Willnecker,et al.  Hypercooling of completely miscible alloys , 1996 .

[12]  A. Turner,et al.  Experimental techniques for observing dislocations by the Berg–Barrett method , 1968 .

[13]  H. Jones.  Formation of metastable crystalline phases in light-metal systems by rapid solidification , 1990 .

[14]  S. N. Ojha.  Metastable phase formation during solidification of undercooled melt , 2001 .

[15]  P. Švec,et al.  Formation of metastable phases from amorphous state , 1997 .