Hu Jiaze, Fan Xiuru, Du Haoheng, Li Guangyu, Wang Xiaoqiong, Kang Xing, Zeng Qiantong
School of Mechanical Engineering and Automation, Dalian Polytechnic University, Dalian 116034, China.
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China.
Materials (Basel). 2025 Aug 27;18(17):4005. doi: 10.3390/ma18174005.
To enhance the interfacial performance of Al/Mg bimetal, this study introduced a novel Mo coating and employed an ultrasonic field (UF) to regulate the interfacial microstructure. In the absence of both a Mo coating and ultrasonic treatment (referred to as the untreated specimen), the interfacial region was primarily composed of Al-Mg intermetallic compounds (Al-Mg IMCs), Al-Mg eutectic structures (ES), and MgSi phases, with an average interfacial layer thickness of approximately 1623 μm. Upon application of the Mo coating, the formation of both Al-Mg phases and MgSi phases was completely inhibited. The interfacial zone was predominantly characterized by the Mo solid solution (Mo SS) and oxide, with the average thickness significantly reduced to about 28 μm. Upon applying the UF to the Mo-coated specimen, the interfacial composition remained similar to that of the untreated specimen, except for Mo SS, with the interfacial thickness increasing to 561 μm. Shear strength tests indicated that the application of the Mo coating alone resulted in a decrease in bonding strength compared to the untreated specimen. However, subsequent ultrasonic treatment significantly improved the interfacial shear strength to 54.7 MPa, representing a 60.9% increase relative to the untreated specimen. This improvement is primarily attributed to the Mo coating and UF synergistically suppressing the formation of brittle Al-Mg IMCs and reducing oxide inclusions at the interface. Thus, the simultaneous application of Mo coatings and ultrasonic fields is required to enhance the properties of Al/Mg bimetals.
为提高铝/镁双金属的界面性能，本研究引入了一种新型钼涂层，并采用超声场（UF）来调控界面微观结构。在既无钼涂层又无超声处理的情况下（称为未处理试样），界面区域主要由铝-镁金属间化合物（Al-Mg IMCs）、铝-镁共晶组织（ES）和MgSi相组成，平均界面层厚度约为1623μm。施加钼涂层后，Al-Mg相和MgSi相的形成均被完全抑制。界面区主要由钼固溶体（Mo SS）和氧化物表征，平均厚度显著减小至约28μm。对涂覆钼的试样施加超声场后，除Mo SS外，界面成分与未处理试样相似，界面厚度增加到561μm。剪切强度测试表明，单独施加钼涂层导致结合强度比未处理试样降低。然而，随后的超声处理显著提高了界面剪切强度至54.7MPa，相对于未处理试样提高了60.9%。这种提高主要归因于钼涂层和超声场协同抑制了脆性Al-Mg IMCs的形成并减少了界面处的氧化物夹杂。因此，需要同时施加钼涂层和超声场来提高铝/镁双金属的性能。
