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Role of interfaces in deformation and fracture of ordered intermetallics [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1996.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
24 pages : digital, PDF file
Additional Creators
Oak Ridge National Laboratory, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
While sub- and grain-boundaries are the primary dislocation sources in Ll₂ alloys, yield and flow stresses are strongly influenced by the multiplication and exhaustion of mobile dislocations from the secondary sources. The concept of enhanced microplasticity at grain boundaries due to chemical disordering is well supported by theoretical modeling, but no conclusive direct evidence exist for Ni₃Al bicrystals. The strong plastic anisotropy reported in TiAl PST (polysynthetically twinned) crystals is attributed in part to localized slip along lamellar interfaces, thus lowering the yield stress for soft orientations. Calculations of work of adhesion suggest that, intrinsically, interfacial cracking is more likely to initiate on γ/γ-type interfaces than on the α₂/γ boundary. 70 refs, 5 tabs, 5 figs.
Report Numbers
E 1.99:conf-9610256--1
conf-9610256--1
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Note
Published through SciTech Connect.
12/31/1996.
"conf-9610256--1"
"DE97003089"
Ecole dislocations `96: interfaces and plasticity, Tozeur (Tunisia), 21-28 Oct 1996.
Fu, C.L.; Yoo, M.H.
Funding Information
AC05-96OR22464
View MARC record | catkey: 14454475