A Ni-Cr-B-Si-Fe-based filler alloy powder has been synthesized by mechanical alloying technique in a high-energy ball mill to join Inconel 718 (IN 718) by transient liquid phase (TLP) bonding. The structural analysis of the synthesized alloy powders was done by field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), field emission transmission electron microscope (FETEM), and laser particle size analyzer (LPSA). Thermal characterization was done by differential scanning calorimetry (DSC). The particle size of 60-h milled powders was found to be 15.4 μm and exhibits equiaxed shapes. Analysis of results reveals that during the milling process, elemental powder mixture gradually transforms to a nano-crystalline non-equilibrium face-centered cubic structured (FCC) Ni (Cr, Fe, Si, B) solid solution alloy. For the powder after 60-h milling, the crystallite size measured by XRD was found to be 4.0 nm. The lattice constant of nickel in the milled powder mixture decreased up to 5 h of milling and increased with a further increase in milling time. Dissolution of Si, B, Cr, and Fe into the Ni matrix resulted in the change of lattice constant of the alloy powder. The DSC result of 60-h milled powders reveals an endothermic peak at 1023.5 °C, which is attributed to the melting of the alloy powder. The activation energy of the milled powder reduced with milling time; as a result, the diffusivity of the elements in the filler metal increased. The activation energy of the 60-h milled alloyed powders was found to be 2714.67 KJ/mol. IN 718 superalloy was joined by the TLP bonding process. The microstructure of the TLP-bonded IN 718 joints showed three distinct zones in the bond area. Increasing the bonding temperature from 1050 to 1100 °C resulted in a 21% increase in the shear strength of TLP-bonded IN 718 alloy.

在高能球磨机中通过机械合金化技术合成了一种Ni-Cr-B-Si-Fe基填充合金粉末，通过瞬时液相（TLP）键合将Inconel 718（IN 718）连接起来。合成合金粉末的结构分析是通过场发射扫描电子显微镜（FESEM），X射线衍射（XRD），场发射透射电子显微镜（FETEM）和激光粒度分析仪（LPSA）进行的。热表征通过差示扫描量热法（DSC）完成。发现60小时研磨的粉末的粒度为15.4μm，并表现出等轴形状。结果分析表明，在研磨过程中，元素粉末混合物逐渐转变为纳米晶非平衡面心立方结构（FCC）Ni（Cr，Fe，Si，B）固溶合金。对于60小时研磨后的粉末，发现通过XRD测量的微晶尺寸为4.0nm。在研磨的粉末混合物中，镍的晶格常数在研磨的5小时内下降，并随着研磨时间的增加而增加。Si，B，Cr和Fe溶解在Ni基体中导致合金粉末的晶格常数发生变化。60 h研磨粉末的DSC结果显示在1023.5°C处有吸热峰，这归因于合金粉末的熔化。研磨粉的活化能随研磨时间而降低；结果，填充金属中元素的扩散率增加。发现60小时研磨的合金粉末的活化能为2714.67KJ / mol。通过TLP粘结工艺将IN 718超级合金连接起来。TLP粘结的IN 718接头的微观结构在粘结区域显示出三个不同的区域。将键合温度从1050升高到1100°C，可使TLP键合的IN 718合金的剪切强度提高21％。