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Creep behavior of a dispersion-strengthened Cu-Ti-Al alloy obtained by reaction milling

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2008-12-20
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Espinoza, Rodrigo G.
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Creep behavior of a dispersion-strengthened Cu-Ti-Al alloy obtained by reaction milling
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Author
  • Espinoza, Rodrigo G.;
  • Palma Hillerns, Rodrigo;
  • Sepúlveda Osses, Aquiles;
  • Zúñiga Páez, Alejandro;
Abstract
Creep results of a dispersion-strengthened nominal-composition Cu-2.5 vol.%Ti-2.5 vol.%Al alloy, and the adjustment of those results to existing creep models, are presented. The alloy was prepared by reaction milling; its microstructural characterization by transmission electron microscopy had been recently reported elsewhere. Creep tests were here performed at 773, 973 and 1123 K, under loads that produced steady-state creep rates between 9 x 10(-7) and 2 x 10(-4) s(-1). Two deformation models, available in the literature, were considered: dislocation creep, where the strain rate is controlled by the dislocation-particle interaction within the grains, and diffusional creep, controlled by the interaction between grain-boundary dislocations and particles. In all creep experiments the alloy exhibited high values of the apparent stress exponent, as typical for dispersion-strengthened alloys. Through model adjustment, the operating creep mechanisms where determined: at 773 and 1123 K creep is controlled by dislocation/particle interactions taking place in the matrix and in grain boundaries, respectively, while at the intermediate temperature of 973 K, controlling dislocation-particle interactions would occur both in the matrix and in grain boundaries.
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Fondecyt 1011024 Conicyt
Identifier
URI: https://repositorio.uchile.cl/handle/2250/125193
DOI: 10.1016/j.msea.2008.08.031
ISSN: 0921-5093
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Volume: 498 Issue: 1-2 Special Issue: Sp. Iss. SI Pages: 397-403 Published: DEC 20 2008
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