基本信息
项目批准号：51575132
申请代码：E0508
项目名称：铝/钢强形变诱导搅拌摩擦扩散焊界面微區(qū)调控机理(lǐ)研究
项目负责人：黄永宪
依托单位：哈尔滨工业大學(xué)
研究期限：2016-01-01 至 2019-12-31
资助经费：63.0（万元）

项目摘要
中文(wén)摘要：
基于铝/钢异种材料结构件轻量化设计在車(chē)辆、船舶、航天航空等领域的迫切需求，针对铝/钢异种材料可(kě)焊性差、界面反应复杂、金属间化合物(wù)难控制等问题，本项目将结合形变诱导快扩散行為(wèi)，探索强形变诱导搅拌摩擦扩散焊新(xīn)方法。基于热源和形变调控，提出搅拌摩擦扩散焊搭接焊具的设计准则。解析强形变诱导作用(yòng)下界面元素快扩散机制，建立界面金属间化合物(wù)厚度与扩散激活能(néng)、反应温度和时间的扩散数理(lǐ)模型，明晰金属间化合物(wù)的形变催化形核、生長(cháng)机制和演化规律，以及形成塑性富铁金属间化合物(wù)的可(kě)能(néng)性和机械冶金生成非晶层的成因和条件。阐明界面宏微纳观多(duō)尺度调控原理(lǐ)，揭示强形变诱导作用(yòng)下金属间化合物(wù)存在形态及分(fēn)布规律，建立界面微區(qū)力學(xué)行為(wèi)和接头宏观承载特性的关联。该技术将為(wèi)铝/钢异种材料轻量化设计的应用(yòng)奠定基础和提供设计依据，同时形变诱导扩散机理(lǐ)的明晰对以界面材料高塑性流变為(wèi)基础的固相连接机制的揭示具有(yǒu)借鉴意义。
英文(wén)摘要：
Assembling aluminium/steel dissimilar materials within integrated structures is nowadays a stringent requirement related to lightweight structures and improved performance for various industrial fields such as transportation, shipbuilding and aerospace. Based on the major challenge due to poor weldability of aluminium to steel, complex interfacial reaction and controlling of intermetallic compounds (IMC), the promising technique of severe deformation inducing friction stir diffusion bonding was proposed with the behavior of high-speed inter-diffusion induced by deformation. The design rules of tools were made according to the requirement of heat input and deformation. The high-speed diffusion mechanism induced by severe deformation was investigated. The atomic diffusion and growing model of interface IMC was established coupling with active energy, reaction temperature and time. The deformation-induced nucleation, the growth kinetics and the evolution of undesirable and brittle IMC were declared. The formation of tough plastic Fe-rich IMC and amorphous structure near the interface due to the mechanical alloying were studied during severe plastic deformation. The interface controlling theory was clarified at the macro-micro-nano multiscale to explore the morphology and distribution of IMC induced by severe plastic deformation. The relationship between interfacial micro-mechanical behavior and joints macro-bearing characteristics was established. The project aims to provide the fundamental theory and effective strategy to the future applications of lightweight structures of aluminium to steel dissimilar material joints. The theory development of diffusion induced by plastic deformation is also the point of interest to investigate the mechanism of other solid state bonding procedures which base on severe plastic deformation and the flow of interfacial materials.
 
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