基本信息
项目批准号：51574196
申请代码：E0414
项目名称：冷喷涂热冲击与喷丸效应协同诱导高强铝合金搅拌摩擦焊接头强韧化机制及可调控性研究
项目负责人：李文亚
依托单位：西北工业大学
研究期限：2016-01-01 至 2019-12-31
资助经费：65.0（万元）

项目摘要
 中文摘要：
抗腐蚀性是搅拌摩擦焊（FSW）接头的重要性能指标。冷喷涂（CS）防护涂层不仅能提高FSW焊缝抗腐蚀性，还能改善接头力学性能，但该力学性能改善的内在机制及其外在诱因尚不清楚。因此，本项目抓住上述关键科学问题，将CS过程中高温高速气流的“热冲击效应”与粒子高速撞击的“喷丸效应”作为突破口，采用实验设计与数值计算方法，系统地研究两种效应（外在诱因）对FSW接头残余应力与显微组织（内在机制）的影响规律，进而揭示CS改善FSW接头强韧性的内在主导机制与外在主导诱因；通过建立内在机制、外在诱因与冷喷涂工艺（如气体温度、粒子速度和喷涂距离）三者之间的相关性，获得接头力学性能改善的协同调控方法；最后，基于实验设计与数据分析，评价该力学性能调控方法的可控性。该研究将促进FSW接头抗腐蚀性能与力学性能一体化调控的实现，有利于FSW在各工业领域的进一步推广应用，同时为探索新的力学性能调控方法指明方向。
英文摘要：
Corrosion resistance is one of important indicators of properties for friction stir welded (FSW) aluminum alloy joints, which should be carefully considered during practical applications. Cold spraying (CS), as an advanced solid-state coating technique, is promising to deposit protective coatings for FSW joints because of their excellent corrosion-resistance, and even more important the modification of joint mechanical properties. However, up to now the underlying mechanism for this exciting fact and its influencing factors are not clear. .Therefore, the project will focus on the thermal shock effect (TSE) caused by the high speed and high temperature gas flow and the peening effect (PE) resulting from the high velocity impact of spray particles during CS. Through the design of experiments (DOE) and numerical simulations, the influences of these two effects (TSE and PE) on the residual stresses and microstructure evolution of FSW joints will be systematically investigated. And then the principal inner mechanisms (i.e. microstructure evolution and residual stresses) and the main external inducing factors (i.e. TSE and PE) for strengthening of joints after CS will be clarified. Furthermore, the methods to control the joint properties will be proposed based on the established relationships among the inner mechanisms, external inducing factors and CS process parameters (e.g. driving gas temperature, particle velocity and spray distance). Finally, the controllability of the methods to improve the joint properties will be evaluated through DOE and data analysis. The achievements of this project will help realize the integrated control of corrosion resistance and strengthening of FSW joints, to promote the applications of FSW in many important industries. This project will also be beneficial to exploring the new strengthening methods for mechanical properties of Al alloys.
 
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