Effects of Al Addition on Structures and Protium Absorption-Desorption Properties of Ti-Cr Alloys

Shirasaki, Kenji; Kuriiwa, Takahiro; Tamura, Takuya; Kamegawa, Atsunori; Takamura, Hitoshi; Okada, Masuo

doi:10.2320/matertrans.43.1173

Cited by 12 publications

(3 citation statements)

References 12 publications

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“…The gamma ray burst GRB 021004 was discovered by HETE at 12:06 UT on 4 October 2002 (Shirasaki et al 2002). Observations beginning less than 10 minutes after the burst revealed a bright fading source (Fox 2002) located at α 2000 = 00 h 26 m 54. s 7, δ 2000 = +18 • 55 ′ 42 ′′ (Henden & Levine 2002a).…”

Section: Introductionmentioning

confidence: 99%

The Unusual Optical Afterglow of the Gamma-Ray Burst GRB 021004: Color Changes and Short-Timescale Variability

Bersier

Stanek

Winn

et al. 2003

The Astrophysical Journal

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We report UBV RI observations of the optical afterglow of the gamma-ray burst GRB 021004. We observed significant (∼ 10−20%) deviations from a power law decay on several time scales, ranging from a few hours down to 20-30 minutes. We also observed a significant color change starting ∼ 1.5 days after the burst, confirming and extending the spectroscopic results already reported by Matheson et al. (2002). We discuss these results in the context of several models that have recently been proposed to account for the anomalous photometric behavior of this event.Subject headings: gamma-ray: bursts 1 Based on data from the FLWO 1.2m telescope, the Magellan 6.5m Landon Clay telescope, the CTIO Blanco 4m telescope, the 1.8m Vatican Advanced Technology Telescope, and the Boyden 1.52m telescope.

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Section: Introductionmentioning

confidence: 99%

The Unusual Optical Afterglow of the Gamma-Ray Burst GRB 021004: Color Changes and Short-Timescale Variability

Bersier

Stanek

Winn

et al. 2003

The Astrophysical Journal

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“…Ti-Cr-V alloys with a BCC structure are regarded as one of the candidates for hydrogen storage tanks. 1) Since the Ti-Cr-V alloys show the capacity of nearly 3 mass% at 373 K, a lot of works, such as the additions of other elements, 2-7) the effects of heat-treatment and composition, [8][9][10][11][12] V free Ti-Cr alloys, [13][14][15][16] cyclic properties [17][18][19] and the effects on hysteresis, 20) have been reported in improving the properties. Ti-Cr-V alloys absorb protium up to H/M = 2 (about 3.7 mass% of protium), but desorb about 2.4 mass% from the viewpoint of protium desorption capacity (9-0.01 MPa) through forming stable protides in low hydrogen pressure regions.…”

Section: Introductionmentioning

confidence: 99%

Isotope Effects on Protium and Deuterium Absorption Properties in Ti-56 at%Cr-20 at%V Alloy

et al. 2004

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Ti-Cr-V alloys are known to absorb protium (hydrogen atom) up to H/M = 2. However, the Cr-rich alloys, e.g. Ti-Cr-20 at%V alloys containing more than 56 at%Cr, absorb up to H/M = 1 because of the formation of the mono-protides (mono-hydrides). The appearance region of the mono-dueteride was found to be more Cr-rich compositions than that of the mono-protides. For example, Ti-Cr-20 at%V alloys containing more than 60 at%Cr absorb deuterium up to D/M = 1. Therefore, Ti-56 at%Cr-20 at%V alloy absorbs protium up to H/M = 1, but deuterium up to D/M = 2. As higher protium desorption capacity is achieved by increasing the Cr content in the region of the di-protide, there is some possibility of increasing the protium desorption capacity in Ti-Cr-V alloys using the isotope effects on absorption-desorption properties of the Ti-56 at%Cr-20 at%V alloy. This paper aims to clarify the isotope effects on protium and deuterium absorption properties in the Ti-56 at%Cr-20 at%V alloy. It was found that the memory effect for the absorption plateau pressure appears only once when deuterium was absorbed after desorbing protium, and the memory effect for the absorption capacity appears when protium was absorbed after desorbing deuterium. The protium desorption capacity after deuterium treatment, namely, after desorbing deuterium showed twice as high as that without deuterium treatment in the Ti-56 at%Cr-20 at%V alloy. Increasing protium desorption capacity for deuterium treatment was caused by increasing di-protide formation and decreasing mono-protide formation.

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“…Ti-Cr-V alloys with a BCC structure are regarded as one of the candidates for hydrogen storage tanks. 1) Since the Ti-Cr-V alloys show the capacity of nearly 3 mass%at 373 K, a lot of works, such as the additions of other elements, 2-7) the effects of heat-treatment and composition, [8][9][10][11][12] V free alloys, [13][14][15][16] cyclic properties 17,18) and the effects on hysteresis, 19) have been reported for improving the properties. Ti-Cr-V alloys absorb protium up to H/M = 2 (about 3.7 mass% of protium), but desorb about 2.4 mass% from the viewpoint of protium desorption capacity (9-0.01 MPa) by forming stable protides in low hydrogen pressure regions.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Isotope Effects on Absorption Properties of Ti-Cr-V Alloys

et al. 2003

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Ti-Cr-V alloys are known to absorb protium (hydrogen atom) up to H/M = 2, while Cr-rich alloys absorb up to H/M = 1 because of the formation of mono-protides (mono-hydrides). However, few hydrogen isotope effects of the Ti-Cr-V alloys have been reported. This paper aims to clarify the hydrogen isotope effects on the absorption properties of the Ti-Cr-V alloys in a composition range near the boundary between the appearance regions of mono-and di-protides. It was found that the appearance region of the mono-dueteride was Cr-richer composition than that of the mono-protides. The absorption plateau pressure for deuterium was lower than that for protium in the appearance region of the di-protide and the di-deuteride, but higher in the appearance region of the mono-protides and the mono-deuteride. The hydrogen isotope effects on the plateau pressure were found to cause the difference in the appearance regions of the protides and the deuterides.

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Effects of Al Addition on Structures and Protium Absorption-Desorption Properties of Ti-Cr Alloys

Cited by 12 publications

References 12 publications

The Unusual Optical Afterglow of the Gamma-Ray Burst GRB 021004: Color Changes and Short-Timescale Variability

The Unusual Optical Afterglow of the Gamma-Ray Burst GRB 021004: Color Changes and Short-Timescale Variability

Isotope Effects on Protium and Deuterium Absorption Properties in Ti-56 at%Cr-20 at%V Alloy

Hydrogen Isotope Effects on Absorption Properties of Ti-Cr-V Alloys

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