Accession Number:

ADP011276

Title:

Resonant Ultrasound Spectroscopy Studies of Metal-Hydrogen Systems

Descriptive Note:

Corporate Author:

COLORADO STATE UNIV FORT COLLINS

Personal Author(s):

• Leisure, Robert G.

Report Date:

2001-06-04

Pagination or Media Count:

11.0

Abstract:

Many metals absorb significant amounts of hydrogen. The hydrogen frequently alters the material properties of the host metal with resulting effects that are sometimes beneficial and sometime deleterious, but generally interesting. Resonant Ultrasound Spectroscopy RUS has been found useful for the study of these materials. The absorption of hydrogen affects the elastic constants, usually, but not always, causing a softening of the lattice. The diffusivehopping motion of the hydrogen gives rise to ultrasonic attenuation if the hopping rate in comparable to the ultrasonic frequency. RUS measurements on hydrogen in Laves phase compounds, rare-earth metals, and quasicrystals will be discussed.

Descriptors:

• *METALS
• *HYDROGEN
• ELASTIC PROPERTIES
• MOTION
• INTERSTITIAL
• ULTRASONICS
• ATTENUATION
• ABSORPTION
• RARE EARTH ELEMENTS
• ULTRASONIC FREQUENCIES

Subject Categories:

• Inorganic Chemistry
• Properties of Metals and Alloys
• Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE