温度诱导非连续液-液结构转变——液态物质新的物理图像

Temperature induced discontinuous liquid-liquid structure transition: New physical image of liquid matter

长期以来,合金成分-温度相图的液相线(TL)以上区域被视为均一的液相区,即传统平衡热力学理论所指的均匀液体。关于液体结构和性质对温度的关系,传统理论一直认为从TL到液-气临界点为连续渐变;然而,近年来的研究却观察到了不同于上述传统理论的新的物理图像;一些合金熔体在高于TL数百度的温度范围,可发生温度诱导液-液转变(TI-LLST),即熔体结构及诸方面性质随温度发生非连续的变化。

It is well known for over one hundred years that there is no other defined phase line above liquidus （TL） in phase diagrams of ordinary binary systems. And the conventional view of liquids is that the liquid structures and properties change gradually with temperature from TL to the critical point. However, in contrast to the conventional concepts, the author＇s research results of recent years show a novel physical image： temperature induced liquid-liquid structure transition（TI-LLST）can occur at temperatures of hundreds of degrees above TLin some investigated binary melts, i.e. the structures and properties change discontinuously with temperature. In this paper, some aspects of the TI LLST are summarily presented, and based on experimental results, the characteristics, rules and mechanism of the found TI-LLST are also theoretically analyzed.