Phase equilibria including L 2 1 full- and C 1 b half-Heusler phases at 1373 K in the Ni-rich portion of the Ni-Ti-Sb system were determined by electron probe microanalysis, x-ray diffraction and differential scanning calorimetry. It was confirmed that both Heusler phases coexist at 1373 K, separated by C 1 b + L 2 1 two-phase region. The single-phase region of the C 1 b phase deviates slightly from the stoichiometric composition of NiTiSb to NiSb-rich direction. On the other hand, while existing in the vicinity of the stoichiometric composition of Ni 2 TiSb, the L 2 1 phase is not stable at temperatures below about 1270 K, disappearing by an eutectoid reaction, L 2 1 → C 1 b + Ni 3 Ti- D 0 24 .

中文翻译：

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Ni-Ti-Sb 三元体系的富镍部分在 1373 K 时的相平衡

通过电子探针微量分析、X 射线衍射和差示扫描量热法确定了在 Ni-Ti-Sb 系统的富 Ni 部分中的包括 L 2 1 全赫斯勒相和 C 1 b 半赫斯勒相的相平衡。已证实两种 Heusler 相在 1373 K 下共存，被 C 1 b + L 2 1 两相区隔开。C 1 b 相的单相区域从NiTiSb 的化学计量组成略微偏离到富含NiSb 的方向。另一方面，虽然存在于 Ni 2 TiSb 的化学计量组成附近，但 L 2 1 相在低于约 1270 K 的温度下不稳定，通过共析反应消失，L 2 1 → C 1 b + Ni 3 Ti-D 0 24。