超快速热处理制备高强高韧金属非晶复合材料的研究

项目名称： 超快速热处理制备高强高韧金属非晶复合材料的研究

项目编号： No.51501103

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 宋凯凯

作者单位： 山东大学

项目金额： 20万元

中文摘要： 通过在非晶基体中原位引入韧性晶体相制备出的金属非晶复合材料由于其优异的室温力学性能，成为非晶合金领域的研究热点之一，但传统的制备工艺并不能非常有效的控制晶体相的析出，不利于此类材料力学性能的进一步提升，极大地限制了其作为结构材料的应用。本项目以铁基和铜锆基非晶合金为研究对象，采用超快速加热和激冷的热处理工艺（即超快速热处理），分别实现对铁基非晶合金中α-Fe韧性晶化相和铜锆基非晶合金中形状记忆性B2 CuZr韧性晶化相形核长大的控制，降低超快速热处理过程中非晶基体中自由体积的湮灭程度，制备出高强高韧铁基和铜锆基非晶复合材料，为非晶复合材料的开发提供一种新的思路。完善在超快速加热条件下的非晶晶化动力学机制，探寻超快速热处理后非晶基体中自由体积的变化规律，揭示变形过程中不同韧性晶体相与剪切带的相互作用，阐明此类复合材料的微观结构和力学性能的内在联系，完善人们对金属非晶复合材料的理解和认知。

中文关键词： 金属非晶复合材料；晶化动力学；自由体积；力学性能

英文摘要： Metallic glass composites, which is fabricated by in situ introducing second ductile crystals into the glassy matrix, has shown excellent mechanical properties at the room temperature and has been paid great attention in the field of metallic glasses. However, it is very difficult to use traditional preparation methods to effectively control the precipitation of second ductile crystals in the glassy matrix and to further improve mechanical properties of metallic glass composites, which has been a stumbling block for practical structural application. Therefore, the ultra-fast heating and chilling treatment is adapted to in situ fabricate high strong and ductile metallic glass composites in Fe-based and CuZr-based alloys. By controlling annealing process parameters, the formation of nano or micro scale ductile α-Fe in Fe-based alloys or B2 CuZr in CuZr-based alloys, and the content of free volume in glassy matrix can be effectively controlled, respectively. The present project could provide a new strategy to fabricate metallic glasses composites with good deformability. Furthermore, the crystallization kinetics of Fe-based and CuZr-based metallic glasses under ultra-fast heating conditions will be clarified. The changes of free volume in the glassy matrix under different heat treatment conditions will be clearly studied. The correlation between the microstructural features and mechanical properties of the present composites will be systematically investigated in order to provide a deep understanding of the formation and deformation mechanisms of the investigated composites.

英文关键词： metallic glass composite;Crystallization kinetics;free volume;Mechanical property