Synthesis, Consolidation, and Mechanical Testing of Nanophase Metals
Kim, Lisa Sungwoon
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https://hdl.handle.net/2142/82888
Description
Title
Synthesis, Consolidation, and Mechanical Testing of Nanophase Metals
Author(s)
Kim, Lisa Sungwoon
Issue Date
1997
Doctoral Committee Chair(s)
Averback, R.S.
Department of Study
Materials Science and Engineering
Discipline
Materials Science and Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Metallurgy
Language
eng
Abstract
Indentation creep experiments were performed on nanocrystalline copper and palladium specimens and also on sinterforged Ti-48Al specimens. The copper and palladium specimens showed a higher creep rate than their microcrystalline counterparts, exhibiting creep even at room temperature. The activation energies for both specimens are lower than activation energy for grain boundary diffusion in microcrystalline materials. A model is proposed to explain the higher creep rate. It assumes that the specimens produced from vapor condensed powders have a higher grain boundary energy due to a higher disorder in their grain boundary structure. Contrary to the pure metal specimens, the sinterforged Ti-48Al specimens exhibited an activation energy close to that for lattice diffusion in the microcrystalline alloy and also the activation energy determined from the sinterforging experiments.
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