The solidification of undercooled Ni-4.5 wt pct B alloy melt was investigated by using the glass fluxing technique. The alloy melt was undercooled up to ΔT _p ~ 245 K (245 °C), where a mixture of α-Ni dendrite, Ni₃B dendrite, rod eutectic, and precipitates was obtained. If ΔT _p < 175 K ± 10 K (175 °C ± 10 °C), the solidification pathway was found as primary transformation and eutectic transformation (L → Ni₃B and L → Ni/Ni₃B); if ΔT _p ≥ 175 K ± 10 K (175 °C ± 10 °C), the pathway was found as metastable eutectic transformation, metastable phase decomposition, and residual liquid solidification (L → Ni/Ni₂₃B₆, Ni₂₃B₆ → Ni/Ni₃B, and L_r → Ni/Ni₃B). A high-speed video system was adopted to observe the solidification front of each transformation. It showed that for residual liquid solidification, the solidification front velocity is the same magnitude as that for eutectic transformation, but is an order of magnitude larger than for metastable eutectic transformation, which confirms the reaction as L_r → Ni/Ni₃B; it also showed that this velocity decreases with increasing ΔT _r, which can be explained by reduction of the residual liquid fraction and decrease of Ni₂₃B₆ decomposition rate.

使用玻璃熔剂技术研究了过冷的Ni-4.5 wt pct B合金熔体的凝固。熔体过冷到Δ的合金Ť _p〜245 K（245℃），其中的混合物α -Ni枝状晶体，镍₃得到乙枝晶，棒晶，和沉淀物。如果ΔT _p <175 K±10 K（175°C±10°C），则发现凝固途径为一次转变和共晶转变（L→Ni ₃ B和L→Ni / Ni ₃ B）。如果Δ Ť _p ≥175ķ±10 K（175℃±10℃），该途径被发现作为亚稳共晶转变，亚稳相分解，残留液体凝固（L→镍/镍₂₃B ₆，Ni ₂₃ B ₆ →Ni / Ni ₃ B和L _r →Ni / Ni ₃ B）。采用高速视频系统观察每个转变的凝固前沿。它表明，对于残留的液体凝固，凝固前沿速度是相同的大小，对于共晶转变，但大小比亚稳共晶转变，大一个数量级，其确认所述反应为L _[R →镍/镍₃ B; 还表明该速度随ΔT _r的增加而降低，这可以通过减少残余液体分数和减少Ni ₂₃ B来解释。₆分解率。