The stainless steel 304L (commercially supplied) and Monel K-500 that was prepared through cold pressing of metal matrix composite materials powder mixtures were joined by diffusion welding. Welding was performed under uniaxial compression using the 50 µm-thick nickel (Ni) and aluminum (Al) 2024 interlayers under 3 MPa at 950–980°C for 60 min in an argon gas atmosphere. After welding, the diffusion and intermediate zones of the samples were characterized using X-ray diffraction, optical microscopy, scanning electron microscopy, and energy-dispersive spectrometry analysis. As evaluating the diffusion zone with interlayer, it was determined that different interlayers expanded due to increasing temperature of the diffusion area. Interlayers expanded more on the K-500 side and relatively less on the 304L side. On the other hand, when samples with Ni interlayers were examined, high amount of Ni contained by both base material (304L) and interlayer led to the formation of rich Ni phases in the diffusion side. The brittle FeNi, Fe₃Ni₂, CuNi, Cu₉Si, Cu_0,81Ni_0,19, Fe_0,64Ni_0,36, CrNi, Cr₂Ni₃, FeNi₃, FeCu₄, and Al_0.71Cr_0.3Fe_17.65, which were identified to form irregularity in the diffusion zone. These intermetallic phases increased the hardness and significantly decreased the ductility of different material couples joined by diffusion welding. As a result, the microhardness and lap shear tests were applied to specimens to characterize the mechanical properties of the joint zones. The maximum hardness and maximum lap shear values were obtained at joint that made with the Al interlayer at 980°C as 432.8 HV and 165 MPa.

通过扩散焊接将304L不锈钢（市售）和通过冷压金属基复合材料粉末混合物制备的Monel K-500结合在一起。使用50 µm厚的镍（Ni）和铝（Al）2024中间层在3 MPa下于950–980°C在氩气气氛中进行单轴压缩焊接60分钟。焊接后，使用X射线衍射，光学显微镜，扫描电子显微镜和能量色散光谱分析对样品的扩散和中间区域进行表征。在评估具有中间层的扩散区时，确定了不同的中间层由于扩散区域的温度升高而膨胀。中间层在K-500侧扩展更多，而在304L侧扩展相对较少。另一方面，当检查具有Ni夹层的样品时，基材（304L）和夹层两者都含有大量的Ni导致在扩散侧形成富Ni相。脆性FeNi，Fe₃的Ni ₂，铜镍，铜₉硅，铜_0,81镍_0,19，铁_0,64镍_0,36，镍铬，铬₂的Ni ₃，镍铁₃，FECU ₄和Al _0.71的Cr _0.3的Fe _17.65被确定在扩散区形成不规则。这些金属间相增加了硬度，并显着降低了通过扩散焊接连接的不同材料对的延展性。结果，对样品进行了显微硬度和搭接剪切试验，以表征接头区域的机械性能。在980℃下以432.8 HV和165 MPa用Al中间层制成的接缝获得了最大硬度和最大搭接剪切值。