Comparison of First Quadrant Yield Loci for Ti-6Al-4V with Those Predicted by Knoop Hardness and Strain Ratio Measurements.

摘要

The first quadrant yield loci of the Ti-6Al-4V alloy determined by means of tensile tests in the rolling and transverse directions and compression tests in the thickness direction were compared with those predicted by Hill's theory of anisotropic yielding and Knoop hardness measurements. Sheet material in the hot-rolled,cold-rolled,and mill-annealed conditions possessing various degrees of anisotropy were examined. The loci predicted from the Knoop hardness measurements did not agree with the measured yield loci for any of the conditions examined. Those predicted by Hill's theory agreed with the measured loci for materials of R value greater than one. (Author)