日本金属学会誌

J. Japan Inst. Metals, Vol. 29, No. 8 (1965),
pp. 745-750

Grain-Boundary Sliding in High-Purity Aluminium (99.999%) Bycrystals during the High-Temperature (Isothermal) Shear Test

Genjiro Mima1 and Toshihiro Oka2

1Faculty of Engineering, Osaka University, Osaka
2Graduate Student of Osaka University, Osaka

Abstract:

Observation has been made of the behavior of deformation in a narrow region above the grain-boundary during high-temperature shear test along the common grain-boundary, using the high-purity aluminium bicrystal (99.999%) which has the boundary misorientation angle of 36 deg. The high-temperature shear test was carried out in the range of temperatures from 160°C to 300°C. Grain-boundary sliding (shear) was observed to take place without over-all deformation of the component crystal, accompanied by the localized deformation in a region adjacent to the common grain-boundary. Measurements were made of the grain-boundary sliding (shear) as a function of shear stress during the test. From the data, the grain-boundary sliding versus shear stress curves were obtained for a given temperatures, and a plot of the logarithms of the slopes for the curves versus the reciprocal of the shear stress resulted in a series of straight lines. This relationship was discussed by the rate equation. Grain-boundary sliding was found together with zone shear, but not vice versa.
Voids are produced by grain-boundary sliding, and obstructed the grain-boundary migration.


(Received 1964/12/17)

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