Abstract
Mechanical testing at 1223 K and at constant strain rates (tensile tests) and constant loads (creep tests) of the single crystal nickel-base superalloy SC16 shows that after an initial hardening the alloy softens during deformation under all testing conditions. Within the testing range covered in the present study two different deformation mechanisms are identified to occur in different regimes of testing. In the present paper we analyse the softening behaviour observed in the low strain rate regime. In this regime the softening is accompanied by a morphological change in γ′ precipitates (rafting). We show that the observed microstructural instability leads to an increase in the spacing between the γ′ particles. This effect quantitatively accounts for the observed softening in this test regime.
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