Small angle neutron scattering from nanocrystalline palladium as a function of annealing

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90260-Y· OSTI ID:6584417

Sanders, P G; Weertman, J R ^[1]; Barker, J G ^[2]; Seigel, R W ^[3]

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1. Northwestern Univ., Evanston, IL (United States)
2. National Inst. of Standards and Technology, Gaithersburg, MD (United States)
3. Argonne National Lab., IL (United States)

Nanocrystalline materials, with grain sizes on the order of nanometers, have many interesting properties as a result of having confining grain sizes and a significant fraction of their atoms in grain boundary regions. Nanocrystalline materials may be synthesized by inert gas condensation and compaction, as developed by Gleiter and co-workers. While this processing method is very effective, it does produce specimens containing defects of various sizes. These different size defects may include voids at the grain boundary junctions, pores having the volume of individual grains, larger flaws and microcracks, and excess free volume at the grain boundaries. Evidence for the presence of these defects in nanocrystalline metals includes substantial deviations from theoretical density, positron lifetime measurements, and small angle neutron scattering (SANS) measurements. The presence of such defects is believed to have a strong influence on the apparent strength of nanocrystalline metals; therefore, any comprehensive study of mechanical behavior should include detailed information on the defect structure of the material. As part of a study of mechanical properties and their correlation with changes in internal structure, SANS measurements were made on a series of nanocrystalline palladium (n-Pd) samples. Preliminary results of the study are described below.

• OSTI ID: 6584417
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:1; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
665100 -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARYONS
CORRELATIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
ELEMENTARY PARTICLES
ELEMENTS
EXPERIMENTAL DATA
FERMIONS
GRAIN BOUNDARIES
GRAIN SIZE
HADRONS
INFORMATION
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
NEUTRONS
NUCLEONS
NUMERICAL DATA
PALLADIUM
PLATINUM METALS
SCATTERING
SIZE
SMALL ANGLE SCATTERING
TRANSITION ELEMENTS