Dislocation-grain boundary interaction in metallic materials: Competition between dislocation transmission and dislocation source activation

The paper introduces first investigations on how low angle grain boundaries can influence the recrystallisation behaviour of crystalline metallic materials. For this purpose a three-dimensional cellular automaton model was used. The approach in this study is to allow even low angle grain boundaries to move during recrystallisation. The effect of this non-zero mobility of low angle grain boundaries will be analysed for the recrystallisation of deformed Al single crystals with Cube orientation. It will be shown that low angle grain boundaries indeed influence the kinetics as well as the texture evolution of metallic materials during recrystallisation.

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Grain-boundary engineering markedly reduces susceptibility to intergranular hydrogen embrittlement in metallic materials

Acta Materialia ◽

10.1016/j.actamat.2009.05.012 ◽

2009 ◽

Vol 57 (14) ◽

pp. 4148-4157 ◽

Cited By ~ 221

Author(s):

S. Bechtle ◽

M. Kumar ◽

B.P. Somerday ◽

M.E. Launey ◽

R.O. Ritchie

Keyword(s):

Hydrogen Embrittlement ◽

Grain Boundary ◽

Metallic Materials ◽

Grain Boundary Engineering

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THE DISLOCATION-GRAIN BOUNDARY INTERACTION AND ITS EFFECT ON THE BOUNDARY DYNAMIC PROPERTIES

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19901108 ◽

1990 ◽

Vol 51 (C1) ◽

pp. C1-679-C1-683

Author(s):

R. Z. VALIEV ◽

V. Yu. GERTSMAN

Keyword(s):

Grain Boundary ◽

Dynamic Properties ◽

Boundary Interaction

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Novel Technique for Quantitative Measurement of Localized Stresses Near Dislocation Channel—Grain Boundary Interaction Sites in Irradiated Stainless Steel

The Minerals, Metals & Materials Series - Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors ◽

10.1007/978-3-030-04639-2_149 ◽

2017 ◽

pp. 2221-2229

Author(s):

D. C. Johnson ◽

G. S. Was

Keyword(s):

Stainless Steel ◽

Grain Boundary ◽

Quantitative Measurement ◽

Interaction Sites ◽

Novel Technique ◽

Boundary Interaction

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Evidence from in situ TEM straining studies for the mechanism of transfer of slip across a grain boundary

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010010514x ◽

1988 ◽

Vol 46 ◽

pp. 616-617

Author(s):

I.M. Robertson ◽

T.C. Lee ◽

P. Rozenak ◽

G.M. Bond ◽

H.K. Birnbaum

Keyword(s):

Mechanical Properties ◽

Grain Boundary ◽

Transfer Process ◽

Boundary Structure ◽

In Situ Tem ◽

Boundary Dislocation ◽

Dislocation Source ◽

Structure Changes ◽

Matrix Dislocation

The bulk mechanical properties of a material will primarily be determined by the integrity of the grain boundaries which depends on the local chemistry and the boundary structure. Changes in the composition of the boundary may affect the strength of the atomic bonds through a redistribution of the electrons; this effect has been predicted from theoretical calculations1 but not determined experimentally. The structure of the boundary will be determined by the mismatch between the adjoining grains and it will affect the mechanism by which strain is transferred through the boundary. From static observations of the interaction between matrix and grainboundary dislocations the following scenario has been constructed for the transfer process through random boundaries; The interaction between the incoming matrix dislocation and those in the grain boundary cause the emission of a dislocation from a grain-boundary dislocation source into the adjacent grain. To preserve the contiguity of the grain boundary a residual dislocation will be created within the grain boundary.

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Effects of Impurities And Alloying Elements on Iron Grain Boundary Cohesion

MRS Proceedings ◽

10.1557/proc-475-499 ◽

1997 ◽

Vol 475 ◽

Cited By ~ 1

Author(s):

D.E. Ellis ◽

X. Chen ◽

G.B. Olson

Keyword(s):

Grain Boundary ◽

Grain Boundaries ◽

Physical And Mechanical Properties ◽

Alloying Elements ◽

Metallic Materials ◽

Crucial Importance ◽

Intergranular Embrittlement ◽

Long Time ◽

Impurity Doped ◽

Segregation Of Impurities

In metallic materials, where grain boundaries(GB) are of crucial importance, impurities and alloying elements play an important role in determining their physical and mechanical properties because the behavior of a grain boundary may change drastically with the presence of impurities and alloying elements. For example, in iron and its alloys, including industrially important steels, the intergranular embrittlement is usually associated with segregation of impurities, like P and S, toward the GBs. On the other hand, alloying elements, like Mo and Pd, are helpful for intergranular cohesion in iron, due to either direct cohesion effect or effect upon embrittling potency of other impurities. Understanding the mechanisms of impurity-promoted embrittlement and the consequent cohesion(decohesion) effects is becoming more and more important and remains as a challenge for materials scientists. There have been intensive investigations on these mechanisms for a long time and with the progress in computing techniques in recent years, calculations on more realistic representations of impurity-doped grain boundaries have become possible[1–4].

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Fracture Toughness and Internal Friction of GlidCop®Al-25 Alloy

MRS Proceedings ◽

10.1557/proc-540-573 ◽

1998 ◽

Vol 540 ◽

Cited By ~ 1

Author(s):

S. Tähtinen ◽

M. Pyykkönen ◽

S. Smuk ◽

H. Hänninen ◽

Y. Jagodzinski ◽

...

Keyword(s):

Fracture Toughness ◽

Internal Friction ◽

Grain Boundary ◽

Grain Boundary Sliding ◽

Boundary Interaction ◽

Two Component ◽

Temperature Component ◽

Boundary Sliding ◽

Increasing Temperature ◽

Friction Study

AbstractFracture toughness was found to decrease rapidly with increasing temperature in dispersionstrengthened GlidCop®Al-25 copper alloy both in the as-supplied condition and neutron irradiated to a dose of 0.3 dpa. Internal friction study revealed two-component peak. Grain-boundary sliding was recognized to be responsible for the low-temperature component of the peak, which disappears after irradiation and restores after the heating above 900 K. This points out that the changes in the particle — grain boundary interaction, apparently, due to the defects at the interfaces produced by irradiation are responsible for the drop of fracture toughness in A125 alloy.

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