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13Â¥2009-03-30 21:31:58
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¡¾ÌâÄ¿¡¿Matching Glass-Forming Ability with the Density of the Amorphous Phase ¡¾×÷Õß¡¿Y. Li,1,2* Q. Guo,1,2 J. A. Kalb,1,3 C. V. Thompson1,3* ¡¾¿¯Ãû¼°ÆÚ¾í¡¿Science 19 December 2008: Vol. 322. no. 5909, pp. 1816 - 1819 ¡¾ÕªÒª¡¿ The density of the amorphous phase of metals is generally thought to be related to glass formation, but this correlation has not been demonstrated experimentally to date. In this work, systematic deflection measurements using microcantilevers and a combinatorial deposition method show a correlation between glass-forming ability and the density change upon crystallization over a broad compositional range in the copper-zirconium binary system. Distinct peaks in the density of the amorphous phase were found to correlate with specific maxima in the critical thickness for glass formation. Our findings provide quantitative data for the development of structural models of liquids that are readily quenched to the amorphous state. The experimental method developed in this work can facilitate the search for new glass-forming alloys. |
2Â¥2009-01-02 20:37:20
hslining
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3Â¥2009-01-03 10:04:33
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¡¾ÌâÄ¿¡¿Crystal chemistry and Calphad modeling of the r phase ¡¾×÷Õß¡¿J.-M. Joubert ¡¾ÕªÒª¡¿A systematic review of the crystal chemical properties of the r phase is presented, with special emphasis on the atomic order, i.e. the distribution of the atoms on the different sites of the crystal structure. The data available in the literature have been systematically assessed, and are complemented by an experimental investigation in the following systems: Al¨CNb, Al¨CTa, Cr¨CMn, Cr¨COs, Cr¨CRe, Cr¨CRu, Co¨CMo, Fe¨CMo, Fe¨CRe, Mn¨CMo, Mn¨CRe, Mn¨CV, Mo¨CRe, Nb¨CPt, Nb¨CRe, Ni¨C V, Pd¨CTa, Re¨CV, Rh¨CTa and Ru¨CW. The properties are analyzed as a function of composition and the nature and atomic size of the elements involved. The possibility of an order¨Cdisorder transition has also been reviewed and completed by diffraction experiments in two systems (Cr¨CMn and Ni¨CV). First-principles calculations on the r phase are reviewed in line with the Calphad approach. An analysis of the literature data concerning the Calphad modeling of systems involving the r phase has been made. The different models used are presented and discussed. The conclusions of crystal structure data analysis are used to make some recommendations about the choice of a model in the frame of a Calphad assessment. ¡¾¿¯Ãû¼°ÆÚ¾í¡¿Progress in Materials Science 53 (2008) 528¨C583 ¡¾ÏÂÔØÁ´½Ó¡¿http://www.namipan.com/d/Hartsch ... 8500605f3a5e1716a00 |
4Â¥2009-01-04 11:03:12













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