金属玻璃液体中的强脆转变现象

发布时间：2018-02-08 17:53

本文关键词： 金属玻璃强脆转变弛豫结构起源　出处：《物理学报》2017年17期 　论文类型：期刊论文

【摘要】：强脆转变是玻璃形成液体在从低温到高温升温过程中由强性液体转变为脆性液体的现象,反之从高温到低温冷却过程即为脆强转变.由于其意味着液体的结构发生了某种快速、非连续的变化,强脆转变现象成为异常动力学的典型代表.自1999年《Nature》杂志首次报道了水的强-脆转变现象之后,液体的强脆转变现象就作为凝聚态物理和材料科学领域中的前沿和热点问题被广泛关注.越来越多的研究表明,强脆转变现象在金属玻璃形成液体中普遍存在.为阐明金属玻璃强-脆转变现象对于深入理解玻璃转变本质、探讨液固遗传微观结构特征、揭示晶化过程相互竞争规律、提高玻璃形成能力、促进金属玻璃制备和处理工艺标准化等方面的重要意义,综合评述了强脆转变现象在金属玻璃形成液体中的普遍性、特殊性、定量表征、热力学表现以及结构起源等研究领域的最新进展,并指出了该领域今后的发展方向.
[Abstract]:The strong brittle transition is the transition of glass forming liquid from strong liquid to brittle liquid in the process from low temperature to high temperature, whereas from high temperature to low temperature the transition is brittle and strong. In 1999, the phenomenon of strong brittle transition of water was first reported in the journal Nature. The phenomenon of strong brittle transition of liquids has been paid more and more attention to as the frontier and hot issues in condensed matter physics and material science. The phenomenon of strong brittle transition is common in metallic glass forming liquid. In order to clarify the phenomenon of strong brittle transition in metallic glass, to understand the nature of glass transition in depth, to probe into the characteristics of liquid-solid genetic microstructure, and to reveal the law of mutual competition in crystallization process. It is important to improve the glass forming ability and to promote the preparation of metallic glass and the standardization of the treatment process. The universality, particularity and quantitative characterization of the phenomenon of strong brittle transition in the forming liquid of metallic glass are comprehensively reviewed. The latest developments in the field of thermodynamics and structural origin are presented, and the future development of this field is pointed out.
【作者单位】：山东大学材料液固结构演变与加工教育部重点实验室;山东科技大学材料科学与工程学院;
【基金】：国家科技重大专项(批准号:2016YFB0300501) 国家自然科学基金(批准号:51571131,51501104)资助的课题~~
【分类号】：TG139.8

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