Hydrogen absorption and electrochemical properties of Mg 2-xNi (x=0-0.5) alloys prepared by bulk mechanical alloying

Toshiro Kuji, Hiroaki Nakano, Tatsuhiko Aizawa

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Thermodynamic properties of hydrides of Mg 2-xNi alloys produced by bulk mechanical alloying were determined from the pressure-composition isotherms for absorption over the temperatures from 623 to 423 K. The van't Hoff plots for the plateau pressures of the isotherms clearly indicated the existence of high- and low-temperature hydrides with different entropy and enthalpy for hydride formation. The phase transition temperature was 525 K for Mg 2.0Ni and decreased with increasing value of x. Chemical and electrochemical behaviors of Mg 2-xNi alloys in an alkaline solution were precisely determined. It was found that hydrogen absorption in Mg 2-xNi alloys takes place by only immersing the alloys in 6 M KOH solution. On the other hand, during electrical charging hydrogen content increased with the quantity of charged electricity and reached the maximum value. However, the hydrogen content decreased afterwards because the corrosion of the alloys in the alkaline solution is significant.

Original languageEnglish
Pages (from-to)590-596
Number of pages7
JournalJournal of Alloys and Compounds
Volume330-332
DOIs
Publication statusPublished - 2002 Jan 17
Externally publishedYes

Fingerprint

Mechanical alloying
Electrochemical properties
Hydrogen
Hydrides
Isotherms
Temperature
Superconducting transition temperature
Enthalpy
Entropy
Thermodynamic properties
Electricity
Phase transitions
Corrosion
Chemical analysis

Keywords

  • Allotropic transformation
  • Bulk mechanical alloying
  • Hydrogen solubility
  • Mg-Ni alloy

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Hydrogen absorption and electrochemical properties of Mg 2-xNi (x=0-0.5) alloys prepared by bulk mechanical alloying. / Kuji, Toshiro; Nakano, Hiroaki; Aizawa, Tatsuhiko.

In: Journal of Alloys and Compounds, Vol. 330-332, 17.01.2002, p. 590-596.

Research output: Contribution to journalArticle

@article{5bc30e3cf1d9408a80fe07b3d4974796,
title = "Hydrogen absorption and electrochemical properties of Mg 2-xNi (x=0-0.5) alloys prepared by bulk mechanical alloying",
abstract = "Thermodynamic properties of hydrides of Mg 2-xNi alloys produced by bulk mechanical alloying were determined from the pressure-composition isotherms for absorption over the temperatures from 623 to 423 K. The van't Hoff plots for the plateau pressures of the isotherms clearly indicated the existence of high- and low-temperature hydrides with different entropy and enthalpy for hydride formation. The phase transition temperature was 525 K for Mg 2.0Ni and decreased with increasing value of x. Chemical and electrochemical behaviors of Mg 2-xNi alloys in an alkaline solution were precisely determined. It was found that hydrogen absorption in Mg 2-xNi alloys takes place by only immersing the alloys in 6 M KOH solution. On the other hand, during electrical charging hydrogen content increased with the quantity of charged electricity and reached the maximum value. However, the hydrogen content decreased afterwards because the corrosion of the alloys in the alkaline solution is significant.",
keywords = "Allotropic transformation, Bulk mechanical alloying, Hydrogen solubility, Mg-Ni alloy",
author = "Toshiro Kuji and Hiroaki Nakano and Tatsuhiko Aizawa",
year = "2002",
month = "1",
day = "17",
doi = "10.1016/S0925-8388(01)01594-8",
language = "English",
volume = "330-332",
pages = "590--596",
journal = "Journal of Alloys and Compounds",
issn = "0925-8388",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Hydrogen absorption and electrochemical properties of Mg 2-xNi (x=0-0.5) alloys prepared by bulk mechanical alloying

AU - Kuji, Toshiro

AU - Nakano, Hiroaki

AU - Aizawa, Tatsuhiko

PY - 2002/1/17

Y1 - 2002/1/17

N2 - Thermodynamic properties of hydrides of Mg 2-xNi alloys produced by bulk mechanical alloying were determined from the pressure-composition isotherms for absorption over the temperatures from 623 to 423 K. The van't Hoff plots for the plateau pressures of the isotherms clearly indicated the existence of high- and low-temperature hydrides with different entropy and enthalpy for hydride formation. The phase transition temperature was 525 K for Mg 2.0Ni and decreased with increasing value of x. Chemical and electrochemical behaviors of Mg 2-xNi alloys in an alkaline solution were precisely determined. It was found that hydrogen absorption in Mg 2-xNi alloys takes place by only immersing the alloys in 6 M KOH solution. On the other hand, during electrical charging hydrogen content increased with the quantity of charged electricity and reached the maximum value. However, the hydrogen content decreased afterwards because the corrosion of the alloys in the alkaline solution is significant.

AB - Thermodynamic properties of hydrides of Mg 2-xNi alloys produced by bulk mechanical alloying were determined from the pressure-composition isotherms for absorption over the temperatures from 623 to 423 K. The van't Hoff plots for the plateau pressures of the isotherms clearly indicated the existence of high- and low-temperature hydrides with different entropy and enthalpy for hydride formation. The phase transition temperature was 525 K for Mg 2.0Ni and decreased with increasing value of x. Chemical and electrochemical behaviors of Mg 2-xNi alloys in an alkaline solution were precisely determined. It was found that hydrogen absorption in Mg 2-xNi alloys takes place by only immersing the alloys in 6 M KOH solution. On the other hand, during electrical charging hydrogen content increased with the quantity of charged electricity and reached the maximum value. However, the hydrogen content decreased afterwards because the corrosion of the alloys in the alkaline solution is significant.

KW - Allotropic transformation

KW - Bulk mechanical alloying

KW - Hydrogen solubility

KW - Mg-Ni alloy

UR - http://www.scopus.com/inward/record.url?scp=0037122595&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037122595&partnerID=8YFLogxK

U2 - 10.1016/S0925-8388(01)01594-8

DO - 10.1016/S0925-8388(01)01594-8

M3 - Article

VL - 330-332

SP - 590

EP - 596

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

ER -