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Fragile-to-Strong Transition in Al-Ni-M （M=La, Pr, Nd） Metallic Glasses

Chinese Physics Letters 2010年第11期27卷 156-158页

作者：张春芝胡丽娜边秀房岳远征 Key Laboratory of Liquid Structure and Heredity of Materials (Ministry of Education) Shandong University Jinan 250061 Section of Chemistry Aalborg University DK-9000 Aalborg Denmark

We study the dynamic behavior of marginal metallic glass-forming liquids Al-Ni-M （M=La, Pr, Nd） in terms of liquid fragility in high and low temperature regions. The liquids are extremely fragile above the liquidus temperature T liq, but become rather strong near the glass transition temperature Tg. The strength of the transition is inversely correlated with the fragility index at Tg. This relation is discussed in terms of potential energy landscape.

关键词： Soft matter liquids and polymers condensed matter: structural mechanical & thermal

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Metastable Phase Separation and Concomitant Solute Redistribution of Liquid Fe-Cu-Sn Ternary Alloy

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Chinese Physics Letters 2010年第2期27卷 213-216页

作者：张晓妹王伟丽阮莹魏炳波 Department of Applied Physics Northwestern Polytechnical University Xi'an 710072

Liquid Fe-Cu-Sn ternary alloys with lower Sn contents are usually assumed to display a peritectic-type solidification process under equilibrium condition. Here we show that liquid Fe47.5Cu47.5Sn5 ternary alloy exhibits a metastable immiscibility gap in the undercooling range of 51-329 K （0.19TL）. Macroscopic phase separation occurs once undercooling exceeds 196 K and causes the formation of a floating Fe-rich zone and a descending Cu-rich zone. Solute redistribution induces the depletion of Sn concentration in the Fe-rich zone and its enrichment in the Cu-rich zone. The primary Fe phase grows dendritically and its growth velocity increases with undercooling until the appearance of notable macrosegregation, but will decrease if undercooling further increases beyond 236 K. The microsegregation degrees of both solutes in Fe and Cu phases vary only slightly with undercooling.

关键词： Soft matter liquids and polymers condensed matter: structural mechanical & thermal

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Strong-Superstrong Transition in Glass Transition of Metallic Glass

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Chinese Physics Letters 2010年第3期27卷 232-235页

作者：王丹彭鸿雁徐晓雨陈宝玲吴春雷孙民华 Key Laboratory of New Carbon-based Functional and Super-hard Materials of Heilongjiang Province School of Physics and Electronic Engineering Mudanjiang Teachers College Mudanjiang 157012 School of Physics and Electronic Engineering Harbin Normal University Harbin 150025

Dynamic fragility of bulk metallic glass （BMG） of Zr64Cu16Ni10Al10 alloy is studied by three-point beam bending methods. The fragility parameter mfor Zr64Cu16Ni10Al10 BMG is calculated to be 24.5 at high temperature, which means that the liquid is a ＂strong＂ liquid, while to be 13.4 at low temperature which means that the liquid is a ＂super-strong＂ liquid. The dynamical behavior of Zr64Cu16Ni10Al10 BMG in the supercooled region undergoes a strong to super-strong transition. To our knowledge, it is the first time that a strong-to-superstrong transition is found in the metallic glass. Using small angle x-ray scattering experiments, we find that this transition is assumed to be related to a phase separation process in supercooled liquid.

关键词： Soft matter liquids and polymers condensed matter: structural mechanical & thermal

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