Abstract
Investigation was made in some detail so as to evaluate the characteristics of the hot torsion test, and an adequate method of evaluation of hot workability of aluminum alloys under hot working conditions was discussed. The most important point is that heat generated by the work of deformation causes a temperature rise, nonuniform temperature distributions and hence nonuniform distributions in shear strain in the specimen. Taking the effects of temperature rise into consideration, the solid cylindrical specimen test is preferred to the tubular specimen and differential test, and shorter gage length is desirable. Temperature change in the specimen was measured during torsional deformation, and a reasonable agreement was obtained between the measured values and the calculated ones which were obtained by solving the differential equations of unsteady heat transfer with proper boundary conditions.
