The kinetics of formation of A AuGeSi metallic glass

Davies, H.A.

doi:10.1016/0022-3093(75)90057-5

Cited by 46 publications

(11 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, in case of weak glass forming alloys, the calculated viscosity at T r is about 3 orders of magnitude of the viscosity at T m , while the experimental values are about 1-2 order of magnitude of viscosity at T m . This difference can be attributed to the fact that VFT equation loses its validity in case of weak glasses [34]. Thus, Eq.…”

Section: Model For the Dg D Of The Undercooled Liquid In Glass Forminmentioning

confidence: 95%

“…However, in case of weak glasses such as Au 77.8 Si 8.4 Ge 13.8 [34], Ti 63 Be 33 and Zr 65 Be 35 [33], the viscosity at T r varies between 1 and 2 orders of magnitude of the viscosity at T m . Alloys having T x /T m more than 0.6 and less than 0.5 can be considered as strong and weak glass, respectively, where T x is the crystallization temperature of the glassy alloy [35].…”

Section: Model For the Dg D Of The Undercooled Liquid In Glass Forminmentioning

confidence: 95%

See 1 more Smart Citation

Prediction of maximum homogeneous nucleation temperature for crystallization of metallic glasses

Mondal¹,

Murty²

2006

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

Section: Model For the Dg D Of The Undercooled Liquid In Glass Forminmentioning

confidence: 95%

Section: Model For the Dg D Of The Undercooled Liquid In Glass Forminmentioning

confidence: 95%

Prediction of maximum homogeneous nucleation temperature for crystallization of metallic glasses

Mondal¹,

Murty²

2006

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

“…curve with the predicted time-temperature-transformation (T.T.T.) curve which can be calculated from homogeneous nucleation and growth theories [53,54]. When the homogeneous nucleation and growth rates of crystal are represented by Ivhomo and U c , respectively, the volume fraction (X) crystal- Calculated t was from the following experimental [56] and reference [53,57] Fig.…”

Section: Kjsmentioning

confidence: 99%

Bulk Amorphous Alloys

Inoue

2001

Advances in Materials Research

179

View full text Add to dashboard Cite

Summary. This chapter aims to review our recent research results on new bulk amorphous alloys. The main topics are the following: (1) the finding of new amorphous alloys with high glass-forming ability in a number of alloy systems; (2) the mechanism for achieving high glass-forming ability; (3) the fundamental properties of the new amorphous alloys; (4) successful examples of producing bulk amorphous alloys by different techniques of water quenching, metallic mold casting, arc melting and unidirectional zone melting, etc.; (5) the high tensile strength, low Young's modulus, and high impact fracture energy of nonferrous metal-based bulk amorphous alloys; (6) the soft magnetic properties of Fe-and Co-based bulk amorphous alloys; (7) hard magnetic properties of Nd-and Pr-based bulk amorphous alloys; (8) the viscous flow and microformability of bulk amorphous alloys in a supercooled liquid region, and (9) future aspects of applications. These new results enable eliminating of the limitation of sample shape which has prevented the development of amorphous alloys as engineering materials. They are expected to give rise to a new era of amorphous alloys. History of Bulk Amorphous AlloysSince an amorphous phase was prepared in the Au-Si system by rapid solidification by Klement et al. in 1960 [1], a great number of scientific and engineering data for amorphous alloys have been accumulated. As a result, it has been clarified that amorphous alloys have new alloy compositions and new atomic configurations which differ from those of crystalline alloys. These features have facilitated the appearance of various characteristics, such as good mechanical properties, useful physical properties and unique chemical properties [2-5J which have not been obtained from conventional crystalline alloys.Recently, amorphous alloys have also attracted increasing interest as precursors to produce nanocrystalline alloys by crystallization because of good mechanical properties [6,7J, soft magnetism [8,9], hard magnetism [10][11][12], high magnetostriction in low applied fields [13], and high catalytic properties [14J which have not been obtained on ordinary amorphous or crystalline alloys. Based on these results, the scientific and engineering importance of amorphous and nanocrystalline alloys has steadily increased for the last three decades. When attention is paid to bulk amorphous alloys with low critical cooling rates (Rc) for glass formation, it is known that Pd4oNi4oP2o [15J and Pd76CU6Si18 [16J amorphous alloys can be produced in a bulk form with diameters up to 3 mm and 0.3 mm, respectively, by water quenching. Subsequently, A. Inoue et al. (eds.), Amorphous and Nanocrystalline Materials

show abstract

“…Equations (6) to (8) have been used to construct the T-T-T curves [3][4][5][6][7][8]. More generally, differentiating Eq.…”

Section: Theoretical Considerationsmentioning

confidence: 99%

“…Some of them have a theoretical basis [1,2] which comes from the assumption of homogeneous nucleation and three dimensional crystal growth, phase boundary limited, in congruently melting alloys [3][4][5][6][7][8]. Another approach eonsists in the experimental determination of some points of a T-T-T curve [9][10][11], generally those corresponding to the maximum of the heat evolution per unit time.…”

mentioning

confidence: 99%

Crystallization kinetic studies: A means to evaluate time-temperature-transformation curves. Application to metallic glasses

Clavaguera-Mora

Suriñach

Baró

et al. 1991

Journal of Thermal Analysis

View full text Add to dashboard Cite

It is shown that the study of the kinetics of crystallization of an amorphous alloy may be used to obtain the correct form of the low temperature part of the time-temperature-transformation (T-T-T) curves. A unified review of the current kinetics of crystallization studies is presented and the general kinetic equation which gives the reaction rate as a function of temperature and crystalline fraction is shown to contain information related to the T-T-T curves. Finally examples of application to two metallic glasses, Nd3Fe77B20 and Fe67.sColsNbl.sB16, obtained by rapid solidification techniques are presented. The comparison between theory and experiment is satisfactory.

show abstract

The kinetics of formation of A AuGeSi metallic glass

Cited by 46 publications

References 6 publications

Prediction of maximum homogeneous nucleation temperature for crystallization of metallic glasses

Prediction of maximum homogeneous nucleation temperature for crystallization of metallic glasses

Bulk Amorphous Alloys

Crystallization kinetic studies: A means to evaluate time-temperature-transformation curves. Application to metallic glasses

Contact Info

Product

Resources

About