T. R. Anantharaman

Review: a decade of quenching from the melt

The technique of rapidly quenching metals and alloys from the melt developed in 1960 by Duwez and his collaborators has gained wide popularity. The extremely high cooling rates (106 to 108° C/sec) attainable with these techniques have yielded supersaturated solid solutions, non-equilibrium crystalline phases and also amorphous alloys. The fascinating results obtained so far, particularly the unusual structures and properties of the new products, are extensively reviewed in this article.

Solidification of aluminium-germanium alloys at high cooling rates

AbstractAluminium-germanium alloys, covering the entire composition range, were subjected to rapid solidification by different techniques ranging from the gun technique of splat cooling to simple quenching of the melt in water. The constitution, microstructure and crystal structure of the alloys thus solidified under cooling rates varying from 103 to 107° C/sec were studied by standard optical, electron- and X-ray metallographic techniques.The solid solubility of Ge in Al could be increased from the equilibrium value of 2.8 at. % to a maximum of 7.2 at. %. In addition, two new non-equilibrium tetragonal phasesγ1(a=12.91 to 13.11 Å,c=12.00 to 12.10 Å) andγ2(a=14.98 Å,c= 16.03 Å) could be obtained in alloys containing 15 to 40 and 40 to 80 at. % Ge respectively. In relation to the face-centred cubicα solid solution, these appear to be made up of 30 and 52 unit cells, respectively, with the relations

Thermodynamic and constitutional studies of the PbTe-GeTe system

a_{\gamma _1 } \simeq \sqrt {10a_\alpha }

Impact of substrate temperature on rapid solidification of an Al-Cu eutectic alloy

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An electron-microscopic investigation of the transformation behaviour of Al6Mg4Cu quasi-crystalline alloy☆

C_{\gamma _1 } \simeq 3a_\alpha

Influence of copper on tempering a low-carbon chromium steel with and without small Nb or Ti additions

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