Effect of annealing heat treatment on an atomized AB2 hydrogen storage alloy

Chuang, Huey-Jan; Huang, Sheng-Siang; Ma, C.Y.; Chan, S.L.I.

doi:10.1016/s0925-8388(98)01050-0

Cited by 14 publications

(10 citation statements)

References 15 publications

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“…Therefore, annealing is not required for AB 2 MH alloys, except for those prepared by GA and with a surface oxide layer, which can be reduced to the metallic state by annealing in hydrogen [62] (Figure 11c). Annealing in Ar was also improved the capacity of GA- [63] and MS- [64] produced AB 2 MH alloys because of the ability to increase the surface crystallinity. The positive contribution of thermal annealing to electrochemical capacity was previously reported by Klein et al [65].…”

Section: Annealingmentioning

confidence: 99%

C14 Laves Phase Metal Hydride Alloys for Ni/MH Batteries Applications

2017

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C14 Laves phase alloys play a significant role in improving the performance of nickel/metal hydride batteries, which currently dominate the 1.2 V consumer-type rechargeable battery market and those for hybrid electric vehicles. In the current study, the properties of C14 Laves phase based metal hydride alloys are reviewed in relation to their electrochemical applications. Various preparation methods and failure mechanisms of the C14 Laves phase based metal hydride alloys, and the influence of all elements on the electrochemical performance, are discussed. The contributions of some commonly used constituting elements are compared to performance requirements. The importance of stoichiometry and its impact on electrochemical properties is also included. At the end, a discussion section addresses historical hurdles, previous trials, and future directions for implementing C14 Laves phase based metal hydride alloys in commercial nickel/metal hydride batteries.

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Section: Annealingmentioning

confidence: 99%

C14 Laves Phase Metal Hydride Alloys for Ni/MH Batteries Applications

2017

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“…Table 2 shows that both heat treatment processes increased the reversible hydrogen storage capacity (RHSC), the capacity increased from 0.44 to 1.26 wt% after annealing and to 1.26 wt% in quenched the sample. The literature indicates that annealing increases hydrogen capacity [13,14]. The BCC phase enhances hydrogen capacity [11,22,29]; increases in the unit cell volume implies the availability of more hydrogen absorption sites or spaces, leading to an increase in storage capacity.…”

Section: Methodsmentioning

confidence: 99%

“…[13]. Chuang et al [14] found that annealing atomized powder of Ti-Zr based alloy at 1123 K for 4 h greatly enhanced the discharge capacity. Hang et al [15] heat treated Ti10V77Cr6Fe6Zr alloy at a relatively lower temperature, but elongated the soaking time by annealing at 1523 K for 5 min and at 1373 K for 8 h and found that sample annealed at 1523 K for 5 min has the best overall hydrogen storage properties, with a desorption capacity of 1.82 wt% and a dehydriding plateau pressure of 0.75 MPa.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Storage Characteristics and Corrosion Behavior of V-rich Ti-V-Cr-Fe Alloy

Abdul¹,

Chown²,

Odusote³

et al. 2017

Preprint

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Abstract:In this work, we investigated the effects of heat treatment on the microstructure, hydrogen storage characteristics and corrosion rate of a Ti34V40Cr24Fe2 alloy. The arc melted alloy was divided into three samples, two of which were separately quartz-sealed under vacuum and heated to 1000 °C for 1 h; one of these samples was quenched and the other furnace cooled to ambient temperature. The crystal structures of the samples were studied via X-ray diffractometry and scanning electron microscopy. Absorption/desorption characteristics were investigated using a Sievert apparatus. Potentiostat corrosion tests on the alloys were performed using an AutoLab ® corrosion test apparatus and electrochemical cell. All samples exhibited a mixture of body-center-cubic (BCC) and Laves phase structures. The corrosion rate, maximum absorption, and useful capacities increased after both heat treatments. The annealed sample had the highest absorption and reversible capacity. The plateau pressure of the as-cast alloy increased after quenching. The corrosion rate increased from 0.0004 mm/y in as-cast sample to 0.0009 mm/y after annealing and 0.0017 mm/y after quenching, due to a decrease in the Cr-content of the C14 phase.

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“…[18]. Chuang et al [19] found that annealing atomized powder of Ti-Zr based alloy at 1123 K for 4 h greatly enhanced the discharge capacity. Hang et al [20] heat-treated Ti 10 V 77 Cr 6 Fe 6 Zr alloy at a relatively lower temperature, but elongated the soaking time by annealing at 1523 K for 5 min and at 1373 K for 8 h, and found that the sample annealed at 1523 K for 5 min had the best overall hydrogen storage properties, with a desorption capacity of 1.82 wt % and a dehydriding plateau pressure of 0.75 MPa.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Storage Characteristics and Corrosion Behavior of Ti24V40Cr34Fe2 Alloy

et al. 2017

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Abstract:In this work, we investigated the effects of heat treatment on the microstructure, hydrogen storage characteristics and corrosion rate of a Ti 34 V 40 Cr 24 Fe 2 alloy. The arc melted alloy was divided into three samples, two of which were separately quartz-sealed under vacuum and heated to 1000 • C for 1 h; one of these samples was quenched and the other furnace-cooled to ambient temperature. The crystal structures of the samples were studied via X-ray diffractometry and scanning electron microscopy. Hydrogenation/dehydrogenation characteristics were investigated using a Sievert apparatus. Potentiostat corrosion tests on the alloys were performed using an AutoLab ® corrosion test apparatus and electrochemical cell. All samples exhibited a major body-center-cubic (BCC) and some secondary phases. An abundance of Laves phases that were found in the as-cast sample reduced with annealing and disappeared in the quenched sample. Beside suppressing Laves phase, annealing also introduced a Ti-rich phase. The corrosion rate, maximum absorption, and useful capacities increased after both heat treatments. The annealed sample had the highest absorption and reversible capacity. The plateau pressure of the as-cast alloy increased after quenching. The corrosion rate increased from 0.0004 mm/y in the as-cast sample to 0.0009 mm/y after annealing and 0.0017 mm/y after quenching.

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Effect of annealing heat treatment on an atomized AB2 hydrogen storage alloy

Cited by 14 publications

References 15 publications

C14 Laves Phase Metal Hydride Alloys for Ni/MH Batteries Applications

C14 Laves Phase Metal Hydride Alloys for Ni/MH Batteries Applications

Hydrogen Storage Characteristics and Corrosion Behavior of V-rich Ti-V-Cr-Fe Alloy

Hydrogen Storage Characteristics and Corrosion Behavior of Ti24V40Cr34Fe2 Alloy

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