Mobility of Low Angle Grain Boundaries in Pure Metals

Myrjam Winning (1) , Anthony Rollett (2) , Günter Gottstein (3) , Lasar Shvindlerman (3, 4) , D J Srolovitz (5) , Adele Lim (6)

1 Microstructure Physics and Metal Forming [MPIE Düsseldorf]
2 Department of Materials Sci.& Eng.
3 IMM - Institut für Metallkunde und Metallphysik
4 ISSP - Osipyan Institute of Solid State Physics
5 IHPC - Institute of High Performance Computing
6 Princeton University

The mobility of low angle grain boundaries is reviewed and several theoretical treatments are provided. The approach that provides the best agreement with the available experimental data is one in which the mobility is controlled by vacancy diffusion through the bulk to (and from) the dislocations that comprise the boundary that are bowing out between pinning points. The pinning points are presumed to be extrinsic dislocations swept into the boundaries or grown in during the prior processing of the material. This approach yields a mobility that is constant with respect to misorientation angle, up to the transition to the high angle regime. For small misorientations of the order 1°, however, the mobility appears to increase with decreasing misorientation angle.

Mots clés: Physical Sciences

Myrjam Winning, Anthony Rollett, Günter Gottstein, Lasar Shvindlerman, D J Srolovitz, et al.. Mobility of Low Angle Grain Boundaries in Pure Metals. Philosophical Magazine, 2010, 90 (22), pp.3107-3128. ⟨10.1080/14786435.2010.481272⟩. ⟨hal-00599235⟩