Record number :
2139084
Title of article :
Creep behavior of an oxide dispersion strengthened Ni3Al ordered intermetallic material
Author/Authors :
Carreٌo، نويسنده , , F and Jiménez، نويسنده , , J.A. and Ruano، نويسنده , , O.A، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2000
Pages :
6
From page :
272
To page :
277
Abstract :
An alternative description of the high temperature creep behavior of oxide dispersion strengthened ordered Ni3A1 material, to that recently given by Klotz et al., is presented in this paper. This material shows much higher values of apparent stress exponent and apparent activation energy than those of the oxide dispersion free material. Analysis of these data following the Arzt detachment model yield to good model predictions only at high temperature, whereas at low temperature the predictions deviate from the experimental data. In agreement with Klotz et al., a threshold stress approach is not appropriate to describe the creep behavior of the investigated material and it is concluded that the creep behavior is controlled by the interaction between dislocations and oxide particles. However, this interaction is best described by a temperature independent stress exponent, ٌ. The ٌ model, which considers that this interaction raises the oxide dispersion free material stress exponent by a value of ٌ, inducing higher apparent activation energy values at high temperatures, satisfactorily describes the experimental data.
Keywords :
Dispersion strengthened materials , creep model , Ordered intermetallics , Creep
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Serial Year :
2000
Link To Document :
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