1981 Volume 45 Issue 6 Pages 574-580
Stress induced migration behavior of three types of tilt boundaries which are described as vertical arrays of a⁄2[1\bar10](001) a⁄2[11\bar2](111), and a[001](010) dislocations for [110], [1\bar10], and [100] tilt boundaries respectively, was investigated by the use of aluminum bicrystals. These three types of boundaries whose misorientation angles were smaller than 10° migrated under the stress and produced plastic strain at elevated temperatures. The migration velocity (v) varied with stress (σ) and temperature (T) according to the following equation:
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\
oindentwhere A(θ,ξ) is a numerical factor depending on the misorientation angle (θ) and type of grain boundary (ξ), n\fallingdotseq1 and Q=80±5 kJ/mol.
Grain boundary sliding occurred at misorientations larger than 10°.