基本信息
项目批准号：51331008
申请代码：E0104
项目名称：轻合金搅拌摩擦焊接/加工中组织控制与力学行为研究
项目负责人：马宗义
依托单位：中国科学院金属研究所
研究期限：2014-01-01 至 2018-12-31
资助经费：300.0（万元）

项目摘要
中文摘要：
作为大塑性变形连接/加工技术，搅拌摩擦焊接与加工（FSW/P）应用前景广阔，但目前对控制组织与力学行为的关键因素仍缺乏深刻认识，急需建立有效的组织和性能的调控与预测手段。本项目选择典型铝、镁、钛合金作为研究对象，采用不同初始晶粒结构材料和多种流变示踪方法进行FSW/P并配合过程急停和急冷，以获得原始材料流动和微观结构演化信息并予以表征；采用逆问题求解摩擦系数与温度的函数关系并采用自主开发的有限元软件进行温度场、残余应力应变场和流变场模拟仿真；系统评价复杂工况下接头力学性能和断裂行为。通过这些研究，揭示材料流动、动态再结晶、第二相快速溶解、元素加速扩散/反应的机制及其关键影响因素，阐明FSW接头在复杂服役条件下的响应机制。从而建立搅拌工具设计和工艺参数优化的指导准则，实现接头组织和性能的有效调控与理论预测。促进FSW/P在我国的研发和工业化应用，丰富经典的金属材料热加工理论。
英文摘要：
As a joining/processing technique by means of severe plastic deformation, friction stir welding and processing (FSW/P) has a wide application prospect. However, the key factors controlling the microstructure and mechanical behavior of FSW/P samples are still not well understood, and establishing effective controlling and predicting methods are highly desired. In this study, typical aluminum alloys, magnesium alloys and titanium alloys are subjected to FSW/P investigations under different conditions. The initial material flow and microstructural evolution during FSW/P of different-grained materials are analyzed in detail by using various tracers and tool extraction technology with rapid instant cooling. The relationship between friction coefficient and temperature is solved by the inverse solution method, and the temperature, residual stress and strain, and material flow during FSW/P are modeled by self-developed finite-element software. The mechanical properties and fracture behavior of the FSW joints are systematically investigated under complicated loading conditions. These investigations will clarify the mechanisms of the material flow, dynamic recrystallization, accelerated particle dissolution and element diffusion/reaction as well as the key influencing factors, and elucidate the response mechanism of the FSW joints under complicated loading conditions, thereby establishing the guide lines for the FSW tool design and parameter optimization, and achieving the effective control and prediction of the microstructure and mechanical properties of the joints. It is expected that this study will speed up the research/development and industrial applications of FSW/P in our country and enrich the classic theories of metal hot-working.
 
                                                                                                                                                                           ——来自https://kd.nsfc.gov.cn/