Fecht, H. J. and Han, G. and Fu, Z. and Johnson, W. L. (1990) Metastable phase formation in the Zr-Al binary system induced by mechanical alloying. Journal of Applied Physics, 67 (4). pp. 1744-1748. ISSN 0021-8979 http://resolver.caltech.edu/CaltechAUTHORS:FECjap90a
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We have studied the sequence of phase transformations induced in the Zr-Al binary system by mechanical alloying of mixed Zr and Al powders. The structure of these materials has been studied by transmission electron microscopy and by x-ray diffraction measurements. Three different metastable phases have been found experimentally with variation of the initial composition xAl: (1) a nanocrystalline supersaturated solid solution of alpha-Zr for xAl<=0.15, (2) an amorphous phase for 0.15<xAl<=0.4, and (3) a metastable face-centered-cubic phase for xAl=0.5 with a grain size of 4 nm. The crystallization reaction of the amorphous phase was monitored by differential scanning calorimetry, and the kinetics of the reaction have been examined as well. A possible explanation based on thermodynamic arguments is given for the defect-driven vitrification of the crystalline Zr phase.
|Additional Information:||Copyright © 1990 American Institute of Physics (Received 23 June 1989; accepted 5 October 1989) The financial support by the U.S. Department of Energy (DOE Contract No. DE-FG03-86ER45242) is gratefully acknowledged. The authors are indebted to C. Garland for the TEM work and E. Hellstern, Y. Seki, and C. E. Krill III for useful discussions.|
|Subject Keywords:||ZIRCONIUM ALLOYS; ALUMINIUM ALLOYS; CRYSTAL–PHASE TRANSFORMATIONS; METALLURGICAL EFFECTS; TRANSMISSION ELECTRON MICROSCOPY; X–RAY DIFFRACTION; SOLID SOLUTIONS; FCC LATTICES; CRYSTALLIZATION; THERMODYNAMICS; SOLID–STATE PHASE TRANSFORMATIONS; METASTABLE PHASES|
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|Deposited On:||27 Oct 2006|
|Last Modified:||26 Dec 2012 09:14|
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