The mechanical alloying of iron and iron alloy powders in a gaseous nitrogen atmosphere resulted in interstitial nitrogen concentrations exceeding 1.0 wt%. The addition of metal nitrides to the iron powders resulted in nanosized nitrides that did not increase the interstitial nitrogen concentration. This distinction in the nitrogen distribution between interstitial nitrogen and metal nitrides is important because tensile strengths of iron alloys are proportional to both interstitial nitrogen and nitride concentration. Using a Hall-Petch relationship (relating the reduced crystallite size and the increased internal strain), the yield stress was found to be related to the square root of the interstitial nitrogen concentration.
Gases; Alloys; Iron; Metallic dusts; Metal alloys; Nanomaterials;
Author Keywords: Mechanical alloying; iron alloys; nitrogen
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