高压变形条件下块体非晶合金与晶态合金的连接及表面改性

项目名称： 高压变形条件下块体非晶合金与晶态合金的连接及表面改性

项目编号： No.51471143

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 贾元智

作者单位： 燕山大学

项目金额： 80万元

中文摘要： 非晶合金具有长程无序的微观结构，合金中不存在晶界、位错等缺陷。因而具有比同类晶态材料优异的力学、磁性等性能。块状非晶合金的密度适中，可以作为航天器备选材料。非晶合金具有高硬度和高耐磨性，如果用作轴承、齿轮等频繁摩擦磨损的传动件，将显著提高传动件的服役性能和使用寿命从而显著提高航天器机构的可靠性和寿命。为了克服非晶合金临界的尺寸对应用的限制，一般将非晶合金与晶态材料进行连接，由非晶合金零件承担工作载荷。以往非晶合金与晶态材料的连接的研究多限于过冷液相温度区间，操控困难。最近我们发现，在一定的压力和变形条件下，非晶合金与晶态材料可在室温下实现原子尺度的连接。另外，由于外来原子向非晶基体内的扩散，导致非晶合金表面的硬度进一步提高。本研究拟利用高压扭转、摩擦焊、高压热处理等手段，研究块状非晶合金与晶态材料连接过程连接界面、力学性能、原子扩散等方面的科学问题，拓宽块状非晶合金在航天领域的应用

中文关键词： 非晶合金；扩散连接；微观结构；力学性能；表面改性

英文摘要： Metallic glasses are a new family of metallic alloys with long-range disorder structure,with no cryatal defects such as grain boundaries or dislocations. Therefore,metallic glass bear better mechanical and magnetic properties compared to their crystalline counterparts. with a moederate density,bulk metallic glass can be used as candidate material for aerospace applications. Due to their high hardness and wear resistance, once used as a driving component material which work under frequently wearing condition,the superior work performance and the long working life will be of benefical for the whole atcive space mechanism. in order to break through the critical size limit that hindering the applications of bulk metallic glass,bonding metallic glass to crystalline alloys are adopted.The bonding was mostly conducted in the temperature range of the supercooled liquid zone,which was not convienient to operate. it is found in our study that under certain pressure and deforming strains, atomic bonding between metallic glass and crystalline alloy can be achieved at room temperature. Moreover, due to the diffusion of the atoms into the glassy matrix,the hardness of the metallic glass was futher increased.In this proprosal, high pressure torsion, friction welding and high pressure annealing experiment will be used to study the interface,mechanical properties, and atom diffusion problems involed in the bonding between metallic glass and crystalline alloys,which will facilitate the application of metallic glass in aerospace.

英文关键词： metallic glass;diffusion bonding;bonding face structure;mechanical properties;surface modification