Abstract
Oxide dispersion strengthened (ODS) ferritic alloys of composition Fe-19Cr-0.5Y2O3have been prepared by mechanical alloying at various heat-treatment conditions to produce a range of grain sizes and dispersed oxide particle size. Fine oxide particles appear to pin grain boundaries and result in inhibition of grain growth in the alloy matrix. Particle strengthening is shown to be a larger component of the material strength, rather than grain boundary strengthening or matrix strength, indicating that the finely dispersed oxide particles contribute very significantly to the total strength of 19Cr-ODS ferritic alloy.
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