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块体非晶合金的非晶形成能力与原子尺寸因素研究
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摘要
块体非晶合金具有许多独特的物理、化学和力学性能,使得其在航空、航天、电子、机械和化工等领域和行业中呈现出广阔的应用前景。因而,对块体非晶的研究无论在理论上还是在应用上都有重要意义。八十年代末国外发现了可以通过铜模冷却制备的块体非晶合金,使得该领域成为新材料研究热点和前沿,但是近几年来,却未见突破性的进展,究其原因,主要是非晶合金的形成机制一直不清楚,对于复杂的多元体系,显然不可能仅仅依靠大量实验及经验规律来获得理想的非晶成分。
     本文选择目前已报道的块体非晶合金作为研究目标,利用现有的大量的数据资源,对原子尺寸因素和非晶形成能力的关系进行系统分析,总结了原子尺寸差以及基元素体积有效率与合金非晶形成能力的关系,并对其合理性进行验证。结果表明,不同非晶合金体系的原子尺寸差范围不同,但是与原子的百分含量呈现一种线性关系,而基元素体积有效率同样与原子百分含量呈现明显的线性关系,并且不同非晶合金体系的这两个参数都与基元素原子半径存在一种趋势,可以在一定程度上表征合金的非晶形成能力,用来进行非晶合金的成分优化和设计,为发展能工业化的块体非晶合金材料及其制备技术提供帮助。
Bulk amorphous alloys, due to their special physical, chemical and mechanical properties, have found applications in many fields such as aviation, spaceflight, electronics, mechanics and chemical industry. Thus, investigation into bulk amorphous alloys is of both theoretical and practical significance. Amorphous alloys had attracted increasing attention since the late 1980’s due to the advent of bulk metallic alloys, readily prepared by copper mould casting method, this field has become a focus and frontier in new materials research. However there has been little progress in recent year regarding new bulk amorphous alloys. This is principally due to the fact that their formation mechanism is largely unknown. This discovery of these amorphous alloys has relied on extensive trials based on empirical rules.
     In this paper, we surveyed from reported literatures the compositions with high glass forming ability. Based on numerous data, systematic study has been carried out on the relation between the size factor and glass forming ability of different alloys. The atomic size criteria has been suggested and verified by other criteria. Each amorphous alloy system has its own atomic size difference ratio domain. And volume effective ratio of matrix element in amorphous alloys has a liner relation versus its concentration. The aim of this study is to find the effective way and proper composition for designing and optimizing amorphous.
引文
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