Fabrication of thin Ni3Al foils by cold rolling

Demura, Masahiko; Kishida, Kyosuke; Suga, Yozo; Takanashi, Motohiro; Hirano, Tôru

doi:10.1016/s1359-6462(02)00139-2

Cited by 52 publications

(72 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A single-crystalline sheet of binary Ni-18 at.% Al having a Goss orientation, grown by an investment cast method, was 83% cold-rolled to the thickness of 315 µm without any intermediate annealing steps; the fabrication process was the same as reported in our previous papers [4,6]. Specimens cut from the cold-rolled foil by electric discharging machining were subsequently heat-treated at 873k or 1273k for 0.5h or 100h in a flowing Ar gas atmosphere after evacuation down to 10 -3 Pa in advance.…”

Section: Methodsmentioning

confidence: 99%

“…One of the promising materials is an intermetallic compound Ni 3 Al and its based alloy consisting of Ni 3 Al and Ni solid-solution phases (Ni 3 Al/Ni two-phase alloys, or so-called Ni-base superalloys), since they have excellent mechanical properties and corrosion/oxidation resistance at high temperatures [1]. We've recently developed their foils by cold rolling [2][3][4][5][6], which became possible using single crystalline ingots as a starting material [7]. Furthermore, we've found that they exhibit a catalytic activity for hydrogen production reactions such as methanol decomposition [8][9][10][11][12] and methane steam reforming [13,14].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Recrystallization Textures in Heavily Cold-Rolled Ni3Al Based Single Crystals

Demura¹,

Xu²,

Hirano³

2010

MSF

Self Cite

View full text Add to dashboard Cite

Abstract. Texture evolution during recrystallization and grain growth was examined for a Ni 3 Al/Ni two-phase single crystal (binary Ni-18 at.% Al) 83% cold-rolled, then compared with that for a Ni 3 Al 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.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recrystallization Textures in Heavily Cold-Rolled Ni3Al Based Single Crystals

Demura¹,

Xu²,

Hirano³

2010

MSF

Self Cite

View full text Add to dashboard Cite

show abstract

“…Ni(γ)/Ni 3 Al(γ´) two-phase foil with the composition of binary Ni-18 at.%Al (thickness of 30 µm) was fabricated by 98 % cold-rolling of a single crystalline ingot [6][7][8]12]. It was heat-treated at 1273 K for 0.5 h in a flowing argon gas after evacuation to ~10 -3 Pa and cut into square-type specimens of 10 x 10 mm.…”

Section: Methodsmentioning

confidence: 99%

Evolution of Surface Morphology in Ni(γ)/Ni3Al(γ´) Two-Phase Foil during Electrochemical Etching

Lee

Demura

et al. 2010

AMR

Self Cite

View full text Add to dashboard Cite

Abstract. Evolution of surface morphology in Ni(γ)/Ni 3 Al(γ´) two-phase foil of binary Ni-18 at.%Al was examined during the electrochemically selective etching in the electrolyte of distilled water including 1 wt.% (NH 4 ) 2 SO 4 and 1 wt.% citric acid. In the early stage (0.5 h), only the γ matrix was etched and the outmost γ´ particles were protected by a preexisting surface product. As the γ matrix was etched more, the side surfaces of the outmost γ´ particles and the γ´ particles that were located inside were exposed in the electrolyte. They were dissolved, and had a high density of fine dimples. However, the dissolution rate of the γ´ particles was slower than that of the γ matrix and thus the selective etching was retained in this stage. Finally, at 5h, more γ´ particles were exposed and the flat and smooth surfaces of the outmost γ´ particles were completely eliminated by the dissolution on the side surfaces. From these observations plus the saturation of the current density observed in the electrochemical test, we concluded that the change in the surface morphology was finished at this stage. Thus, the surface became more rough and irregular, which resulted from the original two-phase microstructure and the fine dimple structure by transpassivation.

show abstract

“…Our previous TEM observation revealed that each band had a single brass texture [11]. Thus, two kinds of bands, (110) [-112] and (110) [1][2][3][4][5][6][7][8][9][10][11][12], which were alternately located in the transverse direction, formed the dual Brass textures in total.…”

Section: Methodsmentioning

confidence: 99%

“…We have developed Ni 3 Al foils for high-temperature micro chemical devices [1][2][3][4][5][6]. For the application there are serious concerns about the brittleness in the foils, especially in the recrystallized state, since the polycrystalline Ni 3 Al is generally brittle due to the grain boundary (GB) fracture.…”

Section: Introductionmentioning

confidence: 99%

Texture Memory Effect in Heavily Cold-Rolled Ni3Al Single Crystals

Demura

Hirano

2007

MSF

Self Cite

View full text Add to dashboard Cite

Abstract. The paper presented the texture evolution during primary recrystallization and following grain growth in the heavily cold-rolled Ni 3 Al single crystals. It turned out that the texture evolution occurred in the two stages. First, primary recrystallization caused the drastic change of the as-rolled texture. Then, as grain growth proceeded, the texture returned to the same one as the as-rolled textures. This texture return can be designated as Texture memory effect. The mechanism of the texture memory effect was discussed based on the analysis of the orientation relationship between the as-rolled and the primary recrystallization textures.

show abstract

Fabrication of thin Ni3Al foils by cold rolling

Cited by 52 publications

References 12 publications

Recrystallization Textures in Heavily Cold-Rolled Ni<sub>3</sub>Al Based Single Crystals

Recrystallization Textures in Heavily Cold-Rolled Ni<sub>3</sub>Al Based Single Crystals

Evolution of Surface Morphology in Ni(γ)/Ni<sub>3</sub>Al(γ´) Two-Phase Foil during Electrochemical Etching

Texture Memory Effect in Heavily Cold-Rolled Ni<sub>3</sub>Al Single Crystals

Contact Info

Product

Resources

About