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Effect of small amounts of hydrogen on the elastic behavior of lutetium (1987)

Greiner, J. D. ; Beaudry, B. J. ; Smith, J. F.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 62 (1987), S. 1220-1223

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The elastic constants of a well-characterized, high-purity single crystal were measured before and after hydrogen was added to change the hydrogen content from 500 at. ppm (3 wt. ppm) to 6900 at. ppm (40 wt. ppm). Comparison between the two sets of measurements shows that such a small change in hydrogen content has a disproportionately large effect on the elastic stiffness. In this case the increase in hydrogen content produced an increase in all directly measured elastic constants by the order of 0.5%. Further comparison of our data with earlier data indicates that other interstitial elements (e.g., C, N, and O) may also exert an inordinately large influence on the elastic stiffness.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.339856

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Magnetic susceptibilities and single crystalline elastic constants of lead-indium alloys (1971)

Planken, J. ; Greiner, J. D. ; Smith, J. F.

Springer

Journal of materials science 6 (1971), S. 1331-1337

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ISSN: 1573-4803

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract The magnetic susceptibilities and single crystalline elastic constants of lead-indium alloys have been measured in the composition range 0 to 20 at.% indium. Comparison of these data with the data from lead-thallium alloys shows that, in the composition range 0 to 7 at.% solute, the solutes serve primarily to deplete the valence electron concentrations with band structures which are essentially the same as that of pure lead. At higher solute concentrations, those parameters of the lead-indium alloys which are controlled by the valence electron distributions diverge from values which would be expected from a simple lowering of the Fermi energy within the band structure of lead. Thus a rigid band approximation is valid at lower but not at higher indium concentrations in the lead-indium system. A qualitative correlation exists between the elastic anisotropy ratios and the stacking fault densities in both the lead-indium and lead-thallium alloy systems.