块体金属玻璃过冷液相的高热稳定性与非晶形成能力的原子机制
收稿日期: 2017-09-11
修回日期: 2017-09-30
网络出版日期: 2017-12-18
基金资助
国家基础研究计划 (2015CB856800)和国家自然科学基金面上项目(51171099)资助
The atomic scale mechanism for the enhanced thermal stability and glass forming ability of bulk metallic glassforming supercooled liquids
Received date: 2017-09-11
Revised date: 2017-09-30
Online published: 2017-12-18
过去几十年里,从原子尺度理解块体金属玻璃形成过冷液相特性与微结构的关系吸引了材料学家和凝聚态物理学家极 大的关注,是此类先进工程金属材料得到实际开发应用的关键之所在。本文综述了前期有关块体金属玻璃有序原子团簇结构随热处理或微量元素添加,演化及其对过冷液相热稳定性、晶化行为和玻璃形成能力影响的研究成果;并聚焦在块体金属玻璃过冷液相中的两类不同原子团簇,即类二十面体原子团簇和类晶体原子团簇。这两类原子团簇的共同存在是块体金 属玻璃高热稳定性和纳米晶化的重要因素。通过微合金可以调控过冷金属液相中原子团簇的结构和体积分数,从而进一步推进它们的实际工程或功能性运用。
关键词: 块体金属玻璃形成过冷液相; 热稳定性; 玻璃形成能力; 原子机制
陆丹玲 , 刘锦川 , 吕坚 , 王庆 , 杨勇 . 块体金属玻璃过冷液相的高热稳定性与非晶形成能力的原子机制[J]. 自然杂志, 2017 , 39(5) : 320 -326 . DOI: 10.3969/j.issn.0253-9608.2017.05.002
Over past decades, large efforts have been devoted to understand the properties of bulk metallic glass (BMG) forming supercooled metallic liquids at atomic level, which is of technological and fundamental importance for the development of advanced engineering metallic material. In this paper, we summarize the previous studies on the structural evolutions of atomic clusters with thermal annealing or minor element addition, which strongly affect the thermal stability, crystallization behavior and glass forming ability of supercooled metallic liquids. The focus is centered on two kinds of atomic clusters, i.e., icosahedral-like and crystal- like atomic clusters. The coexistence of these different atomic clusters is found to be a very important factor for both high thermal stability and nanocrystallization of BMG-forming supercooled liquids. Moreover, through minor element addition, one could tailor the structure and volume fraction of atomic clusters in BMG-forming liquids, furthering their development for practical engineering and/ or functional applications.
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