Predicting the Tensile Behavior of Ti-6.6Al-3.3Mo-1.8Zr-0.29Si Alloy via the Temperature-Dependent Crystal Plasticity Method.

Jun Zhang,Songlin Zheng,Junhong Chen,Peng Wang,Yang Wang

doi:10.3390/ma12193138

Abstract

Uniaxial tensile flow properties of a duplex Ti-6.6Al-3.3Mo-1.8Zr-0.29Si alloy in a temperature range from 213 K to 573 K are investigated through crystal plasticity modelling. Experimental results indicate that the initial yield stress of the alloy decreases as the temperature increases, while its work-hardening behavior displays temperature insensitivity. Considering such properties of the alloy, the dependence of the initial critical resolved shear stress (CRSS) on temperature is taken into account in the polycrystal plasticity modelling. Good coincidence is obtained between modelling and the experimental results. The determined values of CRSS for slip systems are comparable to the published data. The proposed polycrystalline model provides an alternative method for better understanding the microstructure–property relationship of α + β titanium alloys at different temperatures in the future.

Highlights

The experimental results results that the initial yield stress decreased as plasticity temperature increased and work-hardening indicate that the initial yield stress decreased as temperature increased and work-hardening was was observed as temperature insensitive
The modified crystal plasticity formulas employed here observed as temperature insensitive
Good of coincidence was obtained between the modelling and critical resolved shear stress (CRSS) for the obtained between the modelling and experimental results

Summary

Introduction

Experimental results indicate that the initial yield stress of the alloy decreases as the temperature increases, while its work-hardening behavior displays temperature insensitivity. Considering such properties of the alloy, the dependence of the initial critical resolved shear stress (CRSS) on temperature is taken into account in the polycrystal plasticity modelling. The mechanical behavior of such titanium alloys has been improved via controlling the microstructures and alloying elements [2,3] Since these alloys inevitably encounter large deformations when servicing over a wide range of temperatures, the temperature-dependent elastoplastic feature is one of the important issues for the structure design.

Objectives

Results

Conclusion