Cr₃C₂, TaC and VC are the most widely used grain growth inhibitors (GGIs) in cemented carbides. The inhibition effectiveness and the formation of brittle carbides by over-doping these GGIs are closely associated with their solubilities in the binder phase. A series of WC-Ni-based “model alloys” with high content of binder phase and different dopants of GGIs have been designed based on thermodynamic calculations and then prepared through conventional powder metallurgy method. The subsequent microstructures and the solubilities of GGIs in Ni binder phase were characterized by means of scanning electron microscopy (SEM) and wavelength-dispersive electron-probe microanalysis (WDS-EPMA), respectively. The thermodynamic description of the fcc phase (Ni binder phase) has been remodeled according to the presently obtained experimental data. A good agreement between experimental data and thermodynamic calculations can be obtained, which can provide a theoretical basis to the development of WC-Ni-based cemented carbides.

铬₃ C ₂TaC和VC是硬质合金中使用最广泛的晶粒长大抑制剂（GGI）。通过过度掺杂这些GGI的抑制效果和脆性碳化物的形成与其在粘结相中的溶解度密切相关。在热力学计算的基础上，设计了一系列结合相含量高，GGI掺杂量不同的WC-Ni基“模型合金”，并采用常规粉末冶金方法制备。分别通过扫描电子显微镜（SEM）和波长色散电子探针显微分析（WDS-EPMA）表征了Ni粘合剂相中GGI的后续微观结构和溶解度。fcc相（Ni粘结相）的热力学描述已根据当前获得的实验数据进行了重塑。