铝青铜/钛合金双金属界面金属间化合物有序析出及协同强化机理研究

铝青铜/钛合金双金属是航空液压系统高强/耐磨/轻质高压柱塞泵缸体的必选材料，其成功应用有望解决高压柱塞泵依赖进口的卡脖子难题。针对铝青铜/钛合金双金属界面组织调控难和界面强度低的技术瓶颈，本项目重点研究双金属界面过渡层演化、界面金属间化合物的有序析出以及界面组织-力学性能关系，阐明双金属界面金属间化合物析出过程及其对界面强度的影响机理。本项目的研究特色与创新之处在于，基于无序-有序结构转变阐明铝青铜/钛合金双金属界面金属间化合物形成的微观机制，实现双金属界面过渡层组织调控；构建铝青铜/钛合金双金属界面强化模型，明晰双金属成形工艺-界面组织-力学性能的关联特性，优化铝青铜/钛合金双金属材料制备工艺。本项目重点解决铝青铜/钛合金双金属界面金属间化合物的有序析出机制与界面多元协同强化机制两个关键科学问题，实现高可靠铝青铜/钛合金双金属材料的制备，为结构-功能一体化高压柱塞泵缸体制造奠定理论基础。

Aluminum bronze alloy/titanium alloy bimetal is the most promising material for manufacturing cylinder of high-pressure plunger pump with high strength, good wear resistance and light weight, the effective application of which is the key to solve the problem of dependance on imports. In consideration of the difficulties in controlling the interfacial structure and the low interface strength of aluminum bronze alloy/titanium alloy bimetal, the present project mainly focuses on investigating the evolution of interfacial transition layer, the ordering process of interfacial intermetallics and the relationship between interfacial structure and mechanical property, and to clarify the formation process of interfacial intermetallics and its effect on the interface strength of aluminum bronze alloy/titanium alloy bimetal. The feature and innovation of this project is to clarify the formation mechanism of interfacial intermetallics of aluminum bronze alloy/titanium alloy bimetal on the basis of transition of disorder structure to order structure and thus to control the structure of the interfacial transition layer, and to establish the interface strengthening model of aluminum bronze alloy/titanium alloy bimetal and clarify the relationship among process, interfacial structure and mechanical property in order to optimize the process of preparing the aluminum bronze alloy/titanium alloy bimetal. In general, this project aims to clarify the ordering process of interfacial intermetallics and the synergistic strengthening mechanism in the interface of aluminum bronze alloy/titanium alloy bimetal, which achieves the manufacture of high-reliable aluminum bronze alloy/titanium alloy bimetal and lays the foundation for manufacturing the cylinder of high-pressure plunger pump with combined structural and functional performance.