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Title: Structural transformation and improved ductility in ordered FeCo and ZrCo intermetallics

Abstract

Using the first-principles calculations, we find that Fe-Co has a tendency for a structural transformation to a lower symmetry sheared L10 phase under the applied shear stresses. This tendency for structural transformation can have a significant influence on the mechanical properties of FeCo, as it might be closely connected with the intrinsic brittleness of Fe-rich and stoichiometric FeCo alloys and with the improved ductility of Co-rich FeCo alloys. We suggest that improved ductility in Co-rich FeCo alloys may originate from transformation toughening due to the B2-L10 structural transformation near the regions of high stress concentration, as the stress energy is fully dissipated by the decrease in the electronic energy due to the structural phase transformation into a lower energy structure. Similarly, in ZrCo, our first-principles calculations find that a B2-B33 martensitic phase transformation can occur under the applied shear stress, which may contribute to the good ductility of this alloy, despite the fact that ZrCo is a strongly ordered line compound.

Authors:
 [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
931520
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 2006 MRS Fall Meeting, Boston, MA, USA, 20061127, 20061201
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COBALT ALLOYS; IRON ALLOYS; ZIRCONIUM ALLOYS; BRITTLENESS; DUCTILITY; PHASE TRANSFORMATIONS; STRESSES; INTERMETALLIC COMPOUNDS

Citation Formats

Krcmar, Maja, Fu, Chong Long, and Morris, James R. Structural transformation and improved ductility in ordered FeCo and ZrCo intermetallics. United States: N. p., 2007. Web.
Krcmar, Maja, Fu, Chong Long, & Morris, James R. Structural transformation and improved ductility in ordered FeCo and ZrCo intermetallics. United States.
Krcmar, Maja, Fu, Chong Long, and Morris, James R. Mon . "Structural transformation and improved ductility in ordered FeCo and ZrCo intermetallics". United States. doi:.
@article{osti_931520,
title = {Structural transformation and improved ductility in ordered FeCo and ZrCo intermetallics},
author = {Krcmar, Maja and Fu, Chong Long and Morris, James R},
abstractNote = {Using the first-principles calculations, we find that Fe-Co has a tendency for a structural transformation to a lower symmetry sheared L10 phase under the applied shear stresses. This tendency for structural transformation can have a significant influence on the mechanical properties of FeCo, as it might be closely connected with the intrinsic brittleness of Fe-rich and stoichiometric FeCo alloys and with the improved ductility of Co-rich FeCo alloys. We suggest that improved ductility in Co-rich FeCo alloys may originate from transformation toughening due to the B2-L10 structural transformation near the regions of high stress concentration, as the stress energy is fully dissipated by the decrease in the electronic energy due to the structural phase transformation into a lower energy structure. Similarly, in ZrCo, our first-principles calculations find that a B2-B33 martensitic phase transformation can occur under the applied shear stress, which may contribute to the good ductility of this alloy, despite the fact that ZrCo is a strongly ordered line compound.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
Other availability
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