Dynamics of grain boundaries under applied mechanical stress

被引：96

作者：

Molodov, Dmitri A. ^{[1
]}

Gorkaya, Tatiana ^{[1
]}

Gottstein, Guenter ^{[1
]}

机构：

[1] Rhein Westfal TH Aachen, Inst Phys Met & Met Phys, D-52056 Aachen, Germany

来源：

JOURNAL OF MATERIALS SCIENCE | 2011年 / 46卷 / 12期

关键词：

SLIDING BEHAVIOR; SYMMETRIC TILT; MIGRATION; MOTION; DEFORMATION; INCLINATION; ORIENTATION; DEPENDENCE; DIFFUSION; ENERGY;

D O I：

10.1007/s10853-010-5233-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Recent results of experimental research into stress-induced grain boundary migration in aluminum bicrystals are reported. Boundary migration under a shear stress was observed to be coupled to a lateral translation of the grains for planar symmetrical aOE (c) 100 > tilt boundaries. This coupling proved to be the typical migration mode of any aOE (c) 100 > tilt boundary, no matter whether low- or high-angle, low I pound CSL coincidence or non-coincidence boundary. The measured ratios of normal boundary motion to the tangential displacement of grains are in an excellent agreement with theoretical predictions. The migration-shear coupling is also observed for asymmetrical aOE (c) 100 > boundaries. Measurements of the temperature dependence of coupled boundary migration revealed that there is a specific misorientation dependence of migration activation parameters. Grain boundaries can act during their motion under the applied stress as sources of lattice dislocations that leads to the generation and growth of new grains in the boundary region. The rate of stress-induced boundary migration decreases with increasing solute content in aluminum. Both the migration activation enthalpy and the pre-exponential mobility factor were found to increase with rising impurity concentration.

引用

页码：4318 / 4326

页数：9

共 44 条

[1] Compensation effect for grain boundary diffusion in a bicrystalline experiment [J].

Aleshin, AN ;

Faulkner, RG ;

Molodov, DA ;

Shvindlerman, LS .

INTERFACE SCIENCE, 2002, 10 (01) :5-12

[2] RECENT OBSERVATIONS ON THE MOTION OF SMALL ANGLE DISLOCATION BOUNDARIES [J].

BAINBRIDGE, DW ;

LI, CH ;

EDWARDS, EH .

ACTA METALLURGICA, 1954, 2 (02) :322-333

[3] Duality of dislocation content of grain boundaries [J].

Cahn, J. W. ;

Mishin, Y. ;

Suzuki, A. .

PHILOSOPHICAL MAGAZINE, 2006, 86 (25-26) :3965-3980

[4] Coupling grain boundary motion to shear deformation [J].

Cahn, John W. ;

Mishin, Yuri ;

Suzuki, Akira .

ACTA MATERIALIA, 2006, 54 (19) :4953-4975

[5] A unified approach to motion of grain boundaries, relative tangential translation along grain boundaries, and grain rotation [J].

Cahn, JW ;

Taylor, JE .

ACTA MATERIALIA, 2004, 52 (16) :4887-4898

[6] IMPURITY-DRAG EFFECT IN GRAIN BOUNDARY MOTION [J].

CAHN, JW .

ACTA METALLURGICA, 1962, 10 (SEP) :789-&

[7] Grain-boundary shear-migration coupling. II. Geometrical model for general boundaries [J].

Caillard, D. ;

Mompiou, F. ;

Legros, M. .

ACTA MATERIALIA, 2009, 57 (08) :2390-2402

[8]

CELINSKI Z, 1982, RES MECH, V5, P89

[9] Variable-charge method applied to study coupled grain boundary migration in the presence of oxygen [J].

Elsener, A. ;

Politano, O. ;

Derlet, P. M. ;

Van Swygenhoven, H. .

ACTA MATERIALIA, 2009, 57 (06) :1988-2001

[10] Grain boundary migration during room temperature deformation of nanocrystalline Ni [J].

Farkas, Diana ;

Froseth, Anders ;

Van Swygenhoven, Helena .

SCRIPTA MATERIALIA, 2006, 55 (08) :695-698

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