Micromechanical Study of the Forged Ti-1023 Titanium Alloy by Micro-Indentation

Abstract

In order to study the micromechanical behaviour of the forged Ti-1023 titanium alloy, micro-indentation experiments of the forged Ti-1023 titanium alloy were performed with various maximum indentation loads from 500 mN to 4000 mN and various loading speeds from 5.06 mN/s to 51.85 mN/s. Using the experimental data, the non-destructive instrumental approach was applied to indicate the mechanical properties just like the Young’s modulusE, microhardnessH, initial yield stressσyand strain hardening exponentnusing theP-hcurves from the tests. The result showed that the value of the indentation Young’s modulus basically remain unchanged in the range from 110 GPa to 150 GPa andHdecreased with the increase of the load, the micro-indentaion plasticity constitutive equations were obtained by using Hookean elastic and power-law plastic stress-strain equations.

Indentation of Commercial Pure Titanium Processed by Cold Rolling

“…Yapici et al [23] analyzed the anisotropic characters of material after ECAP and cold rolling processing and found that treatment caused stronger crystallographic texture. Li et al [24] studied the mechanical property of the forged Ti-1023 material using microindentation experiments with different indentation loads and various loading speeds, and observed that the indentation Young's modulus nearly kept same and H decreased at higher load level. Ellard et al [25] investigated the mechanical properties of the intermetallic Ti-48Al-2Nb-0.7Cr-0.3Si sheet by analyzing the united impacts of rapid cooling, hot-rolling, and heat treatment on the grain refinement and found that the indentation plastometry based on profilometry for the samples after the rolled and heat treated processing improved the mechanical properties' contrast with the as-cast and as-rolled specimen.…”