This paper aims at understanding the microstructural evolution during the dissimilar brazing of γ-TiAl intermetallic to a Ni-based superalloy by using a novel high-entropy quinary amorphous TiZrNiCuCo filler alloy. Three distinct zones were characterized in the joint region: reaction layer adjacent to the γ-TiAl, diffusion zone in the IN718 side, and centerline solidified zone. Ti-Ni (Cu)-Al intermetallic compounds were formed in the reaction layer. αʹ (Cr, Fe) and γ (Fe, Ni) have precipitated in the γ-Ni matrix of the IN718 substrate discontinuously. The middle TiNi phase solidified isothermally during bonding. The maximum shear strength of 396 MPa achieved at 1020 °C for 40-min bonding, and the high temperature strength was 67% of the room temperature strength.

本文旨在通过使用新型高熵五元非晶态TiZrNiCuCo填充合金，了解将γ-TiAl金属间化合物与Ni基高温合金进行异种钎焊时的组织演变。接合区域的特征是三个不同的区域：与γ-TiAl相邻的反应层，IN718侧的扩散区域和中心线凝固区域。在反应层中形成Ti-Ni（Cu）-Al金属间化合物。αʹ（Cr，Fe）和γ（Fe，Ni）在IN718衬底的γ-Ni基体中不连续地析出。TiNi中间相在键合过程中等温固化。在1020°C下进行40分钟粘结时，最大剪切强度为396 MPa，高温强度为室温强度的67％。