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Browsing by Author D’Souza, N.

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    • A Crystallographic Basis for Critically Evaluating the Mechanisms for Secondary Grain Formation During Directional Solidification
    Authors: D’Souza, N.; Edmonds, I. M.; Perry, M.;  Advisor: -;  Co-Author: - (2023)

    A crystallography-based method is presented for the critical appraisal of possible mechanisms that trigger the formation of secondary grains during directional solidification. The method permits an analysis of a large population of defects, while avoiding the pitfalls of the metallographic sectioning approach that is affected by dendrite stereology. Here, the nickel-base superalloy CMSX-4, an alloy commonly used for single crystal turbine blade applications, is studied. All secondary grains originate exclusively at the external surface and when the off-axial primary ⟨001⟩ crystal orientations are measured, are evident at both the converging and diverging dispositions of the single c...