高氧含量锆基非晶合金非晶形成能力的提高机理及力学性能的研究

Since the discovery of Zr-based metallic glasses, oxygen has been considered to be destructive to the glass forming ability and mechanical properties. This problem has not yet been solved and hinders the wide application of Zr-based metallic glasses. This project proposes to investigate the competing phases in multi-component alloy system with high oxygen content, and to improve the glass forming ability by adjusting the alloy composition. Meanwhile, through the analysis of the oxygen distribution in the alloy, this project also elucidates the mechanism of the ignition and propagation of shear bands. Eventually, Weibull analysis is employed to quantify the transition process of deformation mechanism changing from plasticity to brittleness of the Zr-based metallic glass by studying the statistical dispersion in compression strength under varied oxygen levels. This project focuses on both fundamental research and industrial demand, and provides a guidance to solve the glass forming ability and brittleness problem of Zr-based metallic glasses with high oxygen content.

自锆基非晶发现以来，氧元素就被认为对其非晶形成能力及力学性能有破坏作用，这一问题至今仍未解决，并阻碍着锆基非晶合金的大范围应用。本项目提出通过对高氧含量下多元合金体系中竞争相的分析，应用合金成分的优化及调整来解决高氧含量造成非晶形成能力下降的问题；并研究氧元素在合金中的分布，探索氧元素对于Zr基非晶合金剪切带的产生及发展的作用机理，应用Weibull方法统计研究其强度的变化，量化氧含量的变化对其塑性的影响以及塑/脆性转变的过程。本项目将基础研究与工业需求相结合，通过本项目的研究，将为解决高氧状态中Zr基非晶合金非晶形成能力差、脆性较高的问题提供理论依据。