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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/553

Title: Thermodynamic driving force for rafting in superalloys
Authors: Nabarro, FRN
Cress, CM
Kotschy, P
Keywords: Modern superalloys
Thermodynamic driving forces
Plastic deformation
Poisson contraction
Issue Date: Aug-1996
Publisher: Pergamon-Elsevier Science Ltd
Citation: Nabarro, FRN, Cress, CM and Kotschy, P. Thermodynamic driving force for rafting in superalloys. Acta materialia, vol 44 (8), pp 3189-1398
Abstract: Eshelby’s energy-momentum tensor is used to provide an analytical expression for the driving force for rafting in the elastic regime in a super alloy with a high volume fraction of gamma'. The structure is modeled as a simple cubic array of gamma' cubes separated by thin sheets of gamma'. During rafting, the gamma' particles are constrained to remain tetragonal prisms. For tension along a cube axis, the driving force is proportional to the product of the tension delta, the fractional difference delta of lattice parameters of gamma' and gamma and the fractional difference m of their elastic constants C(11)- C(12). As in the calculation of Pineau for an isolated spheroid, needles are formed when this product sigma delta m is positive. Two- and three-dimensional systems behave similarly. The initial plastic strain in gamma' is anelastic and in principle reversible. When the plastic strain exceeds m delta, platelets perpendicular to the stress axis are formed if the product sigma delta is negative.
Description: Copyright: 1996 Acta Metallurgica Inc.
URI: http://hdl.handle.net/10204/553
ISSN: 1359-6454
Appears in Collections:Manufacturing science and technology
General science, engineering & technology

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