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国家自然科学基金(50801041)

作品数:3 被引量:11H指数:2
相关作者:岳远征张春芝边秀房胡丽娜更多>>
相关机构:奥尔堡大学山东大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划国家教育部博士点基金更多>>
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研究玻璃转变本质的新起点——玻璃态的慢β弛豫被引量:7
2010年
过冷液体在转变为玻璃的过程中,有多种弛豫行为发生,诸如α弛豫、慢β弛豫和快β弛豫等.传统的玻璃转变理论以α弛豫作为研究玻璃本质的基础.然而,近年来有关慢β弛豫的研究表明,慢β弛豫行为与α弛豫的性质密切相关,其性质决定了α弛豫的特点,是玻璃转变行为更微观层次的诱导和基础.为阐明慢β弛豫在研究玻璃转变过程以及过冷态结构的重要意义,综合评述了慢β弛豫在与α弛豫的相关性、慢β弛豫和α弛豫的接合方式、势能图景、过剩翅以及热力学唯象模型等研究领域的最新进展,并指出了该领域今后的发展方向.
胡丽娜张春芝岳远征边秀房
关键词:玻璃转变
A new threshold of uncovering the nature of glass transition:The slow β relaxation in glassy states被引量:4
2010年
The glass transition involves more than one dynamic relaxation mechanisms in supercooled liquids,such as α relaxation,slow β relaxation and fast β relaxation and so on.For the traditional theoretical system,α relaxation is believed mainly responsible for the nature of the glass transition as the beginning of the phenomenon.This idea,however,has been open to a big challenge since recent studies have indicated that slow β relaxation closely relates to α relaxation.Slow β relaxation determines the characteristics of α relaxation and is the precursor and the more microscopic base of glass transition behavior.In order to illuminate the significance of slow β relaxation in the fields of the glass transition and the structure of supercooled liquids,the accomplished progress is summarized from different aspects such as on the correlation between α relaxation and slow β relaxation,on the manner of α-slow β relaxation merging,on the energy landscape,on the excess wing and on the thermodynamically phenomenological models.The tendency of investigation in slow β relaxation is also evaluated.
HU LiNaZHANG ChunZhiYUE YuanZhengBIAN XiuFang
关键词:玻璃化转变热力学
Correlation between microstructure and thermal dilation behavior of amorphous Fe-Co-Zr-Mo-W-B alloys
2010年
The microstructures and thermal properties of Fe61Co9-xZr8Mo5WxB17 (x=0 and 2) formed under different vacuum conditions were investigated by scanning electron microscopy(SEM), X-ray diffractometry(XRD), transmission electron microscopy(TEM), and conventional dilatometry(DIL). The variation of the non-monotonic effects of tungsten content and vacuum conditions on the glass forming ability(GFA) of Fe-based alloys can be drawn in a schematic diagram. The higher the GFA of alloys, the higher the difference between the thermal expansion coefficients of glassy state and crystalline state(-α), which can be described by the free volume model during dilatometric measurements. Under low and high vacuum conditions, the viscosity and microhardness are improved and the fragility of the Fe-based alloys are decreased by adding tungsten.
张集滕王伟民李桂华马海健秦敬玉边秀房
关键词:热膨胀行为铁基合金钼合金X射线衍射仪
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