Abstract/Details

In-situ neutron diffraction analysis of deformation behavior of ductile rare-earth intermetallic yttrium-copper


2009 2009

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Abstract (summary)

Intermetallic compounds exhibit favorable properties for numerous diverse engineering applications. Many intermetallic compounds possess high strength and high stiffness at elevated temperature, excellent corrosion resistance, and low density, making them potentially useful in a wide range of applications. However, several drawbacks, limited ductility in particular, have prevented these compounds from achieving wide-spread application. In order to make full use of potential of intermetallic compounds, these limitations must be better understood and overcome.

In the search for improved ductility in intermetallics, recent findings from an Ames Laboratory research group have uncovered an entire family of compounds possessing the B2 structure which exhibit room temperature tensile ductility. These materials do not require third-element additions, off-stoichiometric chemistry, disordering, or elaborate environmental testing conditions to enhance ductility. Previous studies have investigated various structural and physical properties of this family of compounds, yet the mechanisms for ductility remain uncertain. Low temperature phase transformations are known to occur in several of these compounds. Suggestions for possible mechanisms have included stress-induced phase transformation, as well as the deformation accommodated through crystallographic twinning.

In-situ neutron diffraction allows for observations of structural changes and the relationship to macroscopic physical properties. Using this investigation technique, experiments have been conducted to examine rare-earth intermetallic YCu for evidence of phase transformation, twinning, or indications of other deformation behavior.

Results give insight into the crystal structure of the compound, indicating a high degree of crystal lattice coherency, and resulting dynamical diffraction behavior not commonly observed in engineering materials.

Indexing (details)


Subject
Materials science
Classification
0794: Materials science
Identifier / keyword
Applied sciences; Ductility; Intermetallics; Neutron diffraction; Rare-earth intermetallics; Yttrium-copper
Title
In-situ neutron diffraction analysis of deformation behavior of ductile rare-earth intermetallic yttrium-copper
Author
Williams, Scott H.
Number of pages
131
Publication year
2009
Degree date
2009
School code
0097
Source
DAI-B 70/08, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781109326086
Advisor
Russell, Alan M.; Gschneidner, Karl A.
Committee member
Miller, Gordon; Pecharsky, Vitalij; Ustundag, Ersan
University/institution
Iowa State University
Department
Materials Science and Engineering
University location
United States -- Iowa
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3369910
ProQuest document ID
304907383
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304907383
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