Tungsten heavy alloys (Co–Ni–W) of different compositions were prepared by powder metallurgy (solid sintering), heat treated at 800 °C and 1000 °C and subsequently analyzed. The experimental phase identifications and composition measurements emphasized discrepancies compared to the isothermal ternary sections simulated with commercial thermodynamic databases. The isothermal sections at 800 °C and 1000 °C were found more complex than expected since a new intermetallic phase appeared to be stable (D0_a structure - Cu₃Ti prototype). Likewise, an interpretation of phase equilibria evolution with temperature was established to reach agreement with high temperature data. Formation enthalpies associated with the new phase were obtained through first-principles calculations and supported experimental results as they confirmed the stabilizing role of Ni addition for the D0_a structure.

通过粉末冶金（固体烧结）制备不同成分的钨重合金（Co-Ni-W），在 800°C 和 1000°C 下热处理，然后进行分析。与商业热力学数据库模拟的等温三元截面相比，实验相识别和成分测量强调了差异。发现 800 °C 和 1000 °C 的等温截面比预期的更复杂，因为新的金属间相似乎是稳定的 ( D 0 _a结构 - Cu ₃Ti原型）。同样，建立了随温度的相平衡演变的解释，以与高温数据达成一致。与新相相关的形成焓是通过第一性原理计算获得的，并支持实验结果，因为它们证实了 Ni 添加对D 0 _a结构的稳定作用。