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- W293800498 abstract "We studied dislocation structure in a Ni-based single crystal superalloy after melting and solidification. In our study, we combined polychromatic microbeam synchrotron diffraction measurements together with OIM, scanning electron and optical microscopy. We show that the distribution of the thermal gradient across the fusion line is not monotonic (1, 2). Periodic dislocation structure is formed during continuous movement of melt zone in thin Ni-based superalloy sheet. Moreover we observe oscillations in the dislocation structure formed under such conditions at both macro and micro scales. Depending on the temperature, the formation of dislocations is accompanied by the partial or complete dissolution of γ' particles in the matrix. Dislocations form and multiply due to thermal gradients. Their arrangement correlates with the temperature gradient field and with the dissolution and re- precipitation of γ' particles. The distribution of the dislocation density at the macroscale is due to symmetric temperature gradient perpendicular to the direction of melt zone movement. Within the above macro regions, oscillations of dislocation density due to grouping at the micro scale were also observed. Typical length of microscale of dislocation density oscillations is related to the dendrite size and the conditions of local melt and solidification." @default.
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- W293800498 date "2005-01-01" @default.
- W293800498 modified "2023-09-26" @default.
- W293800498 title "Unusual Dislocation Density Oscillations after Local Melting and Solidification of Ni-based Superalloys" @default.
- W293800498 hasPublicationYear "2005" @default.
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