High-throughput characterization of the cyclic response of Ti-6Al-4V using spherical microindentation stress–strain protocols

Abstract

This paper presents novel high-throughput spherical microindentation measurement and analyses protocols for the cyclic response of metal samples. These protocols are aimed at rapid screening of large design spaces encountered in the development of advanced metal alloys. They involve the measurement of cyclic load-depth hysteresis loops in spherical microindentation, their conversion to cyclic indentation stress–strain hysteresis loops, and the extraction of an indentation cyclic stress–strain curve. The proposed spherical microindentation measurement and analyses protocols are demonstrated on samples of Ti-6Al-4V. The indentation measurements are compared against the measurements obtained on the same material in standard uniaxial stress tests in both monotonic and cyclic loading. The cyclic indentation stress–strain measurements correlated well with the measurements from the standard uniaxial stress tests.