The phase equilibria in the Co-W-Zr ternary system at 1200 and 1300 °C were experimentally investigated by electron probe microanalysis and x-ray diffraction. Totally eight three-phase and seven three-phase regions were confirmed in the 1200 and 1300 °C isothermal sections, respectively. There are two small Liquid regions at 1300 °C, but only one was found at 1200 °C. The Co 11 Zr 2 phase was found at 1200 °C, and dissolved at 1300 °C. The solubility limit of Zr in the (αCo) is about 1.0 at.% at 1200 °C and 3.0 at.% at 1300 at.% and too much Zr addition in Co-based alloys may introduce the Co 11 Zr 2 , Co 23 Zr 6 or Co 2 Zr_Laves phases. The addition of W in the (αCo) should be less than 14.9 at.% at 1200 °C and 15.8 at.% at 1300 °C to prevent the brittle Co 7 W 6 phase.

中文翻译：

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Co-W-Zr 三元体系在 1200 和 1300 °C 时的相平衡

通过电子探针微量分析和 X 射线衍射实验研究了 Co-W-Zr 三元体系在 1200 和 1300 °C 下的相平衡。在 1200 和 1300 ℃等温段分别确认了 8 个三相区和 7 个三相区。在 1300 °C 时有两个小的液体区域，但在 1200 °C 时只发现了一个。Co 11 Zr 2 相在 1200 °C 下被发现，并在 1300 °C 下溶解。Zr 在 (αCo) 中的溶解度极限在 1200 °C 时约为 1.0 at.%，在 1300 at.% 时约为 3.0 at.%，Co 基合金中添加过多 Zr 可能会引入 Co 11 Zr 2 、Co 23 Zr 6 或 Co 2 Zr_Laves 相。在 (αCo) 中添加的 W 在 1200 °C 时应小于 14.9 at.%，在 1300 °C 时应小于 15.8 at.%，以防止 Co 7 W 6 相变脆。