<p>This study investigates the microstructures and properties of brazed joints between sheets of novel experimental Al–Ca–Ce (−Mn) system alloys using aluminum-, silicon-, copper-, and zinc-based braze filler metals (Al–6% Si–24% Cu and Zn–4% Al). The composition and microstructure of the base material, filler metal, and their interfaces, as well as the mutual diffusion of components, were analyzed using scanning electron microscopy, electron probe microanalysis, and&#xa0;X-ray diffraction analysis. The results reveal that the Al–Ca–Ce (−Mn) alloys exhibit a&#xa0;more refined microstructure in the base material compared to the filler metal. An intensive diffusion of calcium, cerium, and manganese from the base metal into the filler metal in the Al–Ca–Ce (−Mn) system alloys leads to the formation of both well-known intermetallic compounds, such as Al₄Ca and Al₁₁Ce₃, and intermetallic phases, including Al₈CaZn₃ and Al₂Cu. The Vickers hardness of the brazed seam was found to be about 2.5&#xa0;times higher than that of the base metal. During tensile testing, samples with Al–6% Si–24% Cu filler metal fractured along the joint boundary, whereas samples with Zn–4% Al filler metal demonstrated higher strength within the joint zone, resulting in fracture occurring outside this region. The combination of the Al–3Ca–3Ce–1Mn base material1 and Zn–4% Al filler metal demonstrated the highest tensile strength. This work highlights the potential of Al–Ca–Ce system alloys as standalone filler metals for joining high-temperature aluminum alloys.</p>