Icosahedral phase formation by the primary crystallization of a Zr-Cu-Pd metallic glass

The addition of Ti, Nb, or Ta altered the crystallization behavior of the Zr65Al7.5Cu27.5 glass, and a metastable nanoscaled I-phase was obtained on primary crystallization of these quaternary glasses. The complete substitution of Al by Nb also led to the precipitation of I-phase upon crystallization. Negative heats of mixing between the addition metals and the transition metals of the mother alloy were demonstrated to be not a necessary condition for I-phase formation in the present alloy system.

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Comments about a recent publication entitled "Improving glass forming ability of off-eutectic metallic glass formers by manipulating primary crystallization reactions”

Scripta Materialia ◽

10.1016/j.scriptamat.2021.114039 ◽

2021 ◽

pp. 114039

Author(s):

Robert F. Tournier ◽

Michael I. Ojovan

Keyword(s):

Metallic Glass ◽

Primary Crystallization ◽

Glass Forming Ability ◽

Glass Forming

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On the Inoculation and Phase Formation of Zr47.5Cu45.5Al5Co2 and Zr65Cu15Al10Ni10 Bulk Metallic Glass Matrix Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1158.43 ◽

2020 ◽

Vol 1158 ◽

pp. 43-97

Author(s):

Muhammad Musaddique Ali Rafique

Keyword(s):

Metallic Glass ◽

Bulk Metallic Glass ◽

Phase Formation ◽

Glass Matrix ◽

Structural Engineering ◽

Matrix Composites ◽

Strain Limit ◽

Glass Matrix Composites ◽

Evolution Of Microstructure ◽

Electron Imaging

Bulk metallic glass matrix composites have emerged as new potential material for structural engineering applications owing to their superior strength, hardness and high elastic strain limit. However, their behaviour is dubious. They manifest brittleness and inferior ductility which limit their applications. Various methods have been proposed to overcome this problem. Out of these, introduction of foreign particles (inoculants) during solidification have been proposed as most effective. In this study, an effort has been made to delimit this drawback. A systematic tale has been presented which explain the evolution of microstructure in Zr47.5Cu45.5Al5Co2 and Zr65Cu15Al10Ni10 bulk metallic glass matrix composites with varying percentage of ZrC inoculant as analysed by secondary electron and back scatter electron imaging of as cast unetched samples. A support is provided to hypothesis that inoculation remain successful in promoting phase formation and crystallinity and improve toughness.

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Improving glass forming ability of off-eutectic metallic glass formers by manipulating primary crystallization reactions

Acta Materialia ◽

10.1016/j.actamat.2020.09.042 ◽

2020 ◽

Vol 200 ◽

pp. 710-719

Author(s):

Y. Q. Zeng ◽

J. S. Yu ◽

Y. Tian ◽

A. Hirata ◽

T. Fujita ◽

...

Keyword(s):

Metallic Glass ◽

Primary Crystallization ◽

Glass Forming Ability ◽

Glass Forming

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Icosahedral-Phase Formation by Solid-State Interdiffusion

Physical Review Letters ◽

10.1103/physrevlett.56.1827 ◽

1986 ◽

Vol 56 (17) ◽

pp. 1827-1830 ◽

Cited By ~ 111

Author(s):

D. M. Follstaedt ◽

J. A. Knapp

Keyword(s):

Solid State ◽

Phase Formation ◽

Icosahedral Phase

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Nanocrystalline Icosahedral Phase Formation in Melt Spun Ti-Zr-Ni Alloys

MATERIALS TRANSACTIONS ◽

10.2320/matertrans.42.372 ◽

2001 ◽

Vol 42 (2) ◽

pp. 372-375 ◽

Cited By ~ 20

Author(s):

B. S. Murty ◽

W. T. Kim ◽

D. H. Kim ◽

K. Hono

Keyword(s):

Phase Formation ◽

Icosahedral Phase ◽

Ni Alloys ◽

Melt Spun

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Solidification and Microstructure Control of Mg-rich Alloys in the Mg-Zn-Y Ternary Systemya

MRS Proceedings ◽

10.1557/proc-643-k2.5 ◽

2000 ◽

Vol 643 ◽

Cited By ~ 6

Author(s):

E.S. Park ◽

S. Yi ◽

J.B. Ok ◽

D.H. Bae ◽

W.T. Kim ◽

...

Keyword(s):

Electron Microscopy ◽

Volume Fraction ◽

Eutectic Reaction ◽

Primary Crystallization ◽

Icosahedral Phase ◽

Orientation Relationships ◽

Transmission Electron ◽

Mg Content ◽

Solidification Microstructures ◽

Scanning Electron

AbstractSolidification microstructures of Mg rich Mg-Zn-Y alloys were studied by using optical microscopy, scanning electron microscopy and transmission electron microscopy. Pseudo eutectic reaction (Liquid→α-Mg + icosahedral phase) takes place during solidification. Alloys containing high Mg content solidifies by primary crystallization ofα-Mg followed by the eutectic reaction at interdendritic region. Mg68Zn28Y4 alloy solidifies by primary crystallization of I-phase followed by theeutectic reaction into a mixture of α-Mg and I-phase. Occasionally D-phase and Mg4Zn7 phases were observed to form with orientation relationships with previously formed I-phase and D-phase, respectively. Thestrength of the alloys increased with increasing the volume fraction of I-phase.

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