锆基块体非晶合金通常具有大的非晶形成能力和优异的性能，有望成为新型的结构材料或功能材料，然而室温下较差的塑性限制了其实际应用。本项目结合锆基非晶合金的研究现状及申请人前期工作，选取Zr-Ni-Al三元系为基础合金系，并以相似组元替代的方式加入其他合金化元素，着眼于高锆含量（Zr≥70at.%）块体非晶合金的形成与力学性能。明确高Zr块体非晶合金的成分规律和力学性能特点；建立Zr含量与块体非晶合金塑性的关联，依据自由体积模型，揭示高Zr含量对提高非晶合金塑性的作用机理；探讨大原子溶剂环境下（即高Zr环境下）非晶内部微结构对非晶形成能力和力学性能的影响。此外，本项目尝试探索高Zr含量的原位析出β-Zr相的非晶基复合材料的形成、组织与力学性能特点。本项目拟发展具有高强度、大塑性的块体非晶合金及其复合材料，为突破块体非晶合金的塑性瓶颈，拓展块体非晶合金的应用领域奠定基础，具有重要科学意义。

Zr-based bulk metallic glasses (BMGs) are promising to become a new type of structural and functional materials due to their high glass-forming ability (GFA) and excellent properties. Lack of plasticity at room temperature, however, restricts their practical applications. In light of the current studies on the Zr-based BMGs and applicants' previous work, this project focuses on the formation and mechanical properties of Zr-based Zr-Ni-Al-TM BMGs with Zr content over 70 at.%, where TM represents the alloyed transition metals. In this project, the formation rule and mechanical properties of BMGs with high Zr content will be clarified. The correlation between Zr content and plasticity will be established and the mechanism of enhanced plasticity of BMGs with high Zr content will be revealed according to the free volume model. Furthermore, the effect of BMG microstructure (e.g.: short-range-order, free volume) formed in the large size atom (Zr atom) solvent on the GFA and mechanical properties will be discussed. In addition, the formation, morphology, and mechanical properties of bulk metallic-glass matrix composites (BMGCs) with high Zr content containing in-situ formed β-Zr-type phase will be studied. This project is aimed to develop BMGs and BMGCs with high strength and good plasticity, which makes contribute to break the bottleneck of plasticity limit of BMGs and expand their application fields.