Structural changes in aluminum in the process of failure under static and cyclic loads

Abstract

1. Cyclic loading at 170° (<0.5Tm), other conditions of deformation being equal, causes intensive intragranular slip and, consequently, strongly localized plastic deformation. This leads to more rapid failure as compared with deformation under static conditions. 2. At 300° (>0.5Tm) the deformation of the grains is also due to other causes — slip under cyclic loading conditions and plastic flow without slip under static loading conditions, which are approximately the same in both cases. The character of the structural changes associated with boundary phenomena and intergranular slip is the same with both types of loading. Since fracture at high temperatures is mainly intergranular, the strength is approximately the same under conditions of both static and cyclic deformation.