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Experimental Studies of Bonding Related Properties in Binary Intermetallics by Convergent Beam Electron Diffraction

Published online by Cambridge University Press:  18 January 2011

X. H. Sang ,
A. Kulovits  and
J. Wiezorek
X. H. Sang
Affiliation:
Department of Materials Science and Mechanical Engineering, Swanson School of Engineering, University of Pittsburgh, 648 Benedum Hall, 3700 O Hara Street, Pittsburgh PA 15261.
A. Kulovits
Affiliation:
Department of Materials Science and Mechanical Engineering, Swanson School of Engineering, University of Pittsburgh, 648 Benedum Hall, 3700 O Hara Street, Pittsburgh PA 15261.
J. Wiezorek
Affiliation:
Department of Materials Science and Mechanical Engineering, Swanson School of Engineering, University of Pittsburgh, 648 Benedum Hall, 3700 O Hara Street, Pittsburgh PA 15261.
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Abstract

Accurate Debye-Waller (DW) factors of chemically ordered β-NiAl (B2, cP2, ) have been measured at different temperatures using an off-zone axis multi-beam convergent beam electron diffraction (CBED) method. We determined a cross over temperature below which the DW factor of Ni becomes smaller than that of Al of ~90K. Additionally, we measured for the first time DW factors and structure factors of chemically ordered γ1-FePd (L10, tP2, P4/mmm) at 120K. We were able to simultaneously determine all four anisotropic DW factors and several low order structure factors using different special off-zone axis multi-beam convergent beam electron diffraction patterns with high precision and accuracy. An electron charge density deformation map was constructed from measured X-ray diffraction structure factors for γ1-FePd.

Keywords

transmission electron microscopy (TEM)electronic structurealloy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n05-41
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

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