Abstract
Texture evolution during recrystallization and grain growth was examined for a Ni3Al/Ni two-phase single crystal (binary Ni-18 at.% Al) 83% cold-rolled, then compared with that for a Ni3Al single-phase single crystal (Ni-24 at.% Al). The cold-rolled single crystal had a sharp {110}<001> (Goss) texture. When it was recrystallized at 873K, the texture changed into a complicated one consisting of several components. Most of them had a special rotation relationship to the original Goss texture, i.e. 40˚ about <111>, which special relationship was similarly observed in the single-phase case. The 40˚<111> texture became shaper with no quantitative change as the grain growth proceeded. This high stability of the recrystallized texture contrasted with the single-phase case in which the authors previously found that the texture returned to the original Goss texture. The difference was discussed based on the orientation analysis by an electron backscattered diffraction method.
Highlights
Heat-resistant metallic foils and sheets are one of the key materials in high-temperature micro-scale systems, e.g. a chemical reactor to produce hydrogen
One of the promising materials is an intermetallic compound Ni3Al and its based alloy consisting of Ni3Al and Ni solid-solution phases (Ni3Al/Ni two-phase alloys, or so-called Ni-base superalloys), since they have excellent mechanical properties and corrosion/oxidation resistance at high temperatures [1]
The Ni3Al based foils can be used as a container and a catalyst in the micro chemical reactor for hydrogen production
Summary
Heat-resistant metallic foils and sheets are one of the key materials in high-temperature micro-scale systems, e.g. a chemical reactor to produce hydrogen. The Ni3Al based foils can be used as a container and a catalyst in the micro chemical reactor for hydrogen production When they are in service at elevated temperatures, recrystallization and grain growth occur in such heavily cold-rolled metallic foils. The texture returned to the same {110} texture as the cold rolled one after the grain growth at higher temperatures, typically 1273K (Fig. 1(c)) We describe this phenomenon as texture memory effect. We here examined the textures in the Ni3Al/Ni two-phase single crystal 83% cold-rolled and subsequently heat-treated, paying attention to whether or not the texture memory effect occurred. The results were compared with those in the single-phase Ni3Al
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