Platinum/titanium (Pt/Ti) bimetal composite is of utmost interest to the electrochemical industry for its superior functionality. Here, an improved explosive welding (EW) technology was introduced to join Pt foil and Ti sheet, and the microstructure evolution of the achieved Pt/Ti joint as well as the thermodynamic behaviors during the EW process was systematically investigated by various microscopic observations and smoothed particles hydrodynamics (SPH) simulation. It was found that the Pt/Ti EW interface was featured by a straight metallurgical reaction layer with a width of ~ 30 μm, and its formation mechanism was related to localized melting followed by intense mechanical mixing of participant metals. In the reaction layer, both elements of Pt and Ti were detected, and the average phase was determined to be Pt_0.69Fe_0.31. The EBSD analyses revealed a remarkable grain structure change near the interface, such as grain orientation deflection in Pt matrix, heat-induced grain growth in Ti matrix, and the formation of extra fine nanograins in the reaction layer. The SPH simulation well captured the morphology features of the Pt/Ti interface, and quantificationally revealed the extreme thermodynamic states of high heat of ~ 2000 K, high pressure of ~ 5 GPa, and large strain of ~ 3 during the EW process. Finally, the nanoindentation results revealed inhomogenous mechanical behaviors near the bonding interface.

铂/钛 (Pt/Ti) 双金属复合材料因其卓越的功能而受到电化学行业的极大关注。在这里，引入了一种改进的爆炸焊接 (EW) 技术来连接 Pt 箔和 Ti 片，并通过各种显微观察系统地研究了所实现的 Pt/Ti 接头的微观结构演变以及 EW 过程中的热力学行为，并进行了平滑处理粒子流体动力学 (SPH) 模拟。结果发现，Pt/Ti EW 界面的特征是直的冶金反应层，宽度约为 30 μm，其形成机制与局部熔化以及随后参与金属的强烈机械混合有关。在反应层中检测到Pt和Ti两种元素，确定平均相为Pt _0.69铁_0.31。EBSD 分析揭示了界面附近显着的晶粒结构变化，例如 Pt 基体中的晶粒取向偏转、Ti 基体中的热诱导晶粒生长以及反应层中超细纳米晶粒的形成。SPH 模拟很好地捕捉了 Pt/Ti 界面的形貌特征，并定量揭示了 EW 过程中约 2000 K 的高温、约 5 GPa 的高压和约 3 的大应变的极端热力学状态。最后，纳米压痕结果揭示了键合界面附近的不均匀机械行为。