Undercooled Solidification of Ni-3.3wt.%B Alloy

Feng Liu; Jun Feng Xu

doi:10.4028/www.scientific.net/AMR.562-564.15

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 562-564Undercooled Solidification of Ni-3.3wt.%B Alloy

Undercooled Solidification of Ni-3.3wt.%B Alloy

Abstract:

Ni-3.3wt.%B alloy solidified at different undercooling by glass fluxing has been studied. The as-solidified structure is mainly controlled by the undercooling for eutectic solidification, ΔT₂, instead of ΔT₁, the undercooling for primary solidification. For ∆T₂2 ≥145±5K, three recalescence peaks appear in cooling curves. If ∆T₂2≥145±5 K, two kinds of dot phases occur. Further analysis declares that, the regularly distributed dot phases with larger size come from the transformation L→Ni₂₃B₆+Ni, whereas, the irregularly distributed ones with smaller size come from Ni₂₃B₆→Ni₃B+Ni. Both of them have a contribution to strengthen the mechanical property.