6533b857fe1ef96bd12b4578
RESEARCH PRODUCT
Effects of ball-milling on the hydrogen sorption properties of LaNi5
Boby JosephBenedetto Schiavosubject
Materials scienceHydrogenHydrideAnnealing (metallurgy)Mechanical EngineeringUltra-high vacuumMetallurgyMetals and AlloysIntermetallicIntermetallicchemistry.chemical_elementSorptionHydrogen absorbing materialchemistryChemical engineeringMechanics of MaterialsMaterials ChemistryParticle sizeMechanical alloyingBall milldescription
Abstract Pressure–composition isotherms of LaNi 5 alloys were studied as function of ball-milling time. Results indicate that ball-milling convert a part of the LaNi 5 to a non-absorbing state—a state which does not absorb hydrogen under conditions where un-milled LaNi 5 powders absorb and transform to LaNi 5 H 6 , in addition to particle size reduction and creation of defects. The non-absorbing fraction in the milled sample is found to grow with increase in the ball-milling time. The resistance to the hydride formation of the long-time ball-milled LaNi 5 samples is found to continue even after a 1-h high vacuum annealing at around 1000 K. This indicates that the hydrogen-absorption-resist-anomalous state formed during the long-time ball-milling is rather stable.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-07-01 |