Grain boundary decohesion in body-centered cubic Mg-Li-Al alloys

ABSTRACTThe deformation behavior of Ni3Al alloys with various chemical compositions and subjected to different heat treatments were in-situ observed in SEN. Moreover, in-situ observations of slip trace are supplemented by the direct observation of dislocation arrangements by TEM. In boron-doped Ni3Al alloys it is shown that close to the grain boundary there exists a thin slip transition region, within which slip lines are reoriented or other slip systems are operated to produce a local strain accommodation and to relax the stress concentration at grain boundaries. However, boron-enhenced ductility is seriously affected by alloy stoichiometry, the addition of a tertiary alloy element and heat treatment, etc.

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Aluminum grain boundary decohesion by dense sodium segregation

Physical Review B ◽

10.1103/physrevb.85.214109 ◽

2012 ◽

Vol 85 (21) ◽

Cited By ~ 12

Author(s):

Shengjun Zhang ◽

Oleg Y. Kontsevoi ◽

Arthur J. Freeman ◽

Gregory B. Olson

Keyword(s):

Grain Boundary ◽

Grain Boundary Decohesion

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Grain boundary decohesion by metal å covalent bond transition for bonds emanating from segregant atoms

Scripta Metallurgica ◽

10.1016/0036-9748(81)90221-0 ◽

1981 ◽

Vol 15 (4) ◽

pp. 413-415 ◽

Cited By ~ 10

Author(s):

E.S. Machlin

Keyword(s):

Grain Boundary ◽

Covalent Bond ◽

Grain Boundary Decohesion

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Novel combination of 3DXRD and grain boundary tracking for mapping polycrystaline Al-alloys

Acta Crystallographica Section A Foundations of Crystallography ◽

10.1107/s0108767311083462 ◽

2011 ◽

Vol 67 (a1) ◽

pp. C654-C654

Author(s):

D. J. LeClere ◽

Y. Ohkawa ◽

H. Toda ◽

M. Kobayashi ◽

Y. Suzuki ◽

...

Keyword(s):

Grain Boundary ◽

Al Alloys ◽

Boundary Tracking

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Grain-Boundary Segregation of La and Zr in Alumina Scales Formed on Fe-20 mass%Cr-5 mass%Al Alloys

Journal of the Japan Institute of Metals and Materials ◽

10.2320/jinstmet1952.60.5_463 ◽

1996 ◽

Vol 60 (5) ◽

pp. 463-468 ◽

Cited By ~ 5

Author(s):

Shin Ishikawa ◽

Masa-aki Kohno ◽

Chizuko Maeda ◽

Kazuhide Ishii ◽

Jun-ichi Shimomura ◽

...

Keyword(s):

Grain Boundary ◽

Boundary Segregation ◽

Al Alloys ◽

Grain Boundary Segregation ◽

Alumina Scales

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Magnetostrictive properties of body-centered cubic Fe-Ga and Fe-Ga-Al alloys

IEEE Transactions on Magnetics ◽

10.1109/20.908752 ◽

2000 ◽

Vol 36 (5) ◽

pp. 3238-3240 ◽

Cited By ~ 464

Author(s):

A.E. Clark ◽

J.B. Restorff ◽

M. Wun-Fogle ◽

T.A. Lograsso ◽

D.L. Schlagel

Keyword(s):

Al Alloys ◽

Body Centered Cubic

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Thermoviscoplasticity in Body-Centered Cubic Metals: A Two-Temperature Model With Grain Boundary Evolution

Journal of Applied Mechanics ◽

10.1115/1.4048041 ◽

2020 ◽

Vol 87 (11) ◽

Author(s):

Gurudas Kar ◽

Debasish Roy ◽

J. N. Reddy

Keyword(s):

Plastic Deformation ◽

Grain Boundary ◽

Internal Variable ◽

Dislocation Motion ◽

Body Centered Cubic ◽

Boundary Density ◽

Different Temperatures ◽

Growth Dislocation ◽

Thermodynamics Modeling ◽

Two Temperature

Abstract In this work, we develop a thermo-viscoplasticity model for body-centered cubic (BCC) metals based on a two-temperature theory of nonequilibrium thermodynamics. Modeling the plastic deformation here involves two subsystems, viz., a configurational subsystem related to grain growth, dislocation motion, and a kinetic vibrational subsystem describing the vibration of atoms. Due to a separation of the time scales, the two subsystems are described by two different temperatures. In this study, we introduce a grain boundary density, in addition to the mobile and forest dislocation densities, as an internal variable. The focus in this paper is on how large plastic deformation is affected by the evolving grain boundaries. In order to check the predictive quality of the model, numerical simulations are conducted and validated against available experimental evidence wherever possible.

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