A Possibility to Synchronously Improve the High-Temperature Strength and Ductility in Face-Centered Cubic Metals Through Grain Boundary Engineering

2020 ◽  
Author(s):  
Xiao Wu Li ◽  
F. Shi ◽  
H.M. Ji ◽  
X.W. Li
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
High Temperature Strength ◽  
Face Centered Cubic ◽  
Grain Boundary Engineering ◽  
Cubic Metals ◽  
Face Centered ◽  
Strength And Ductility

Nearly Dislocation-Free APB Termination at Pure Grain Boundary Step Defects in L10 Alloys

1993 ◽  
Vol 319 ◽  
Author(s):  
Abha Singh ◽  
A.H. King
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Tetragonal Phase ◽  
Cubic Phase ◽  
Face Centered Cubic ◽  
Antiphase Boundaries ◽  
New Type ◽  
Face Centered ◽  
Fcc Phase ◽  
Step Defect

AbstractL10 alloys typically derive from a high-temperature, disordered fcc phase. For example, CuAu has a face centered tetragonal structure below 380°C and is derived from its high temperature, disordered face centered cubic phase. As the material transforms from the disordered fcc phase to the ordered tetragonal phase, the four distinct Σ3 fcc twin misorientations generate twelve distinct tetragonal twin misorientations, four being characterized as Σ3 and eight as Σ6. Of particular interest is the Σ6 structure because it is possible to terminate lattice antiphase boundaries without dislocations at this interface. A pure step defect at the interface can accommodate the APB termination due to anti-site coincidence (coincidence between copper and gold sites). We term these defects “antiphase steps”. The antiphase step is a new type of interfacial defect that has not been described by other workers. The possibility of forming antiphase steps in ordered L10 alloys is related to even-Σ interfaces. Since the Σ6 boundary is common in the ordered phase, the formation of dislocation-free APB terminations may be important in L10 alloys.

Comparing grain boundary energies in face-centered cubic metals: Al, Au, Cu and Ni

2010 ◽  
Vol 63 (9) ◽  
pp. 905-908 ◽  
Author(s):  
Elizabeth A. Holm ◽  
David L. Olmsted ◽  
Stephen M. Foiles
Keyword(s):  
Grain Boundary ◽  
Face Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

scholarly journals Grain Boundary Evolution of Face-Centered Cubic Metals during in-situ TEM Annealing

2013 ◽  
Vol 19 (S2) ◽  
pp. 446-447
Author(s):  
J.G. Brons ◽  
G.B. Thompson
Keyword(s):  
Grain Boundary ◽  
In Situ Tem ◽  
Face Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Voids in Irradiated Tungsten and Molybdenum

1969 ◽  
Vol 27 ◽  
pp. 190-191
Author(s):  
Robert C. Rau ◽  
Robert L. Ladd
Keyword(s):  
Melting Point ◽  
Fast Neutron ◽  
Neutron Irradiation ◽  
Elevated Temperatures ◽  
Irradiation Temperature ◽  
The Body ◽  
Face Centered Cubic ◽  
Body Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Recent studies have shown the presence of voids in several face-centered cubic metals after neutron irradiation at elevated temperatures. These voids were found when the irradiation temperature was above 0.3 Tm where Tm is the absolute melting point, and were ascribed to the agglomeration of lattice vacancies resulting from fast neutron generated displacement cascades. The present paper reports the existence of similar voids in the body-centered cubic metals tungsten and molybdenum.

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