A brief discussion on the tensile creep deformation behaviour of wrought single phase $\gamma$-TiAl

TL;DR

This paper revisits the tensile creep deformation behavior of wrought single-phase $ ext{γ}$-TiAl alloy, analyzing steady state creep, stress exponent variation with temperature, and activation energies using established models.

Contribution

It provides a detailed reanalysis of original data on tensile creep behavior of wrought $ ext{γ}$-TiAl, focusing on steady state creep and activation energy determination across a temperature range.

Findings

Steady state creep behavior characterized through strain vs. strain rate plots.

Stress exponent varies with temperature between 760°C and 900°C.

Activation energies calculated using Zener-Hollomon and Sherby-Dorn methods.

Abstract

Creep deformation behaviour in single phase $\gamma$-TiAl alloy has been an extensively studied topic since the late 1970s. A lot of literatures have reported creep behaviour of $\gamma$-TiAl alloys, manufactured using different processing techniques. The present discussion revisits the original work on understanding the tensile creep deformation behaviour of wrought single-phase $\gamma$-TiAl alloy by Hayes et al and is aimed to develop an understanding of steady state creep, through strain vs strain rate and strain vs ln(strain rate) plots. Besides, it also attempts to study the variation of stress exponent with temperature between 760 and 900C and also, to determine activation energies using the two most common approaches, namely: Zener-Hollomon and Sherby-Dorn for stress levels of 69.4 and 103.4 MPa between 760 and 900C.