過冷Co75B25合金的凝固

過冷Co75B25合金的凝固Solidification of Undercooled Co75B25 Alloy

利用熔融玻璃包覆加循環(huán)過熱技術將Co75B25包晶合金熔體過冷至液相線下不同溫度，通過凝固組織觀察結合冷卻曲線分析，確立了其凝固路徑。結果表明，所有過冷度凝固后的試樣中均只有α-Co和Co2B相，Co2B相與殘余液相反應形成Co3B相的包晶轉變被完全抑制，且在344 K實驗所得最大過冷度下Co3B相也不能作為初生相析出。即使降低冷速至5 K/min，合金在小過冷度下凝固時也沒有發(fā)生包晶反應。

Co75B25 alloy melt was undercooled to different degrees using the glass fluxing technique, and the solidification path was identified by analyzing the microstructures and cooling curves of the samples. There was nothing other than α-Co and Co2B phases to form during solidification, indicating that not only the peritectic reaction of L (liquid) and Co2B into Co3B but also the formation of Co3B as primary phase at large undercooling were inhibited. The peritectic reaction did not occur even though the melt solidified at a very small undercooling and a cooling rate decreased to 5 K/min.

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