Flow Stress of 6061 Aluminum Alloy at Typical Temperatures during Friction Stir Welding Based on Hot Compression Tests

Abstract

The purpose of this paper is to report quantitative data and models for the flow stress for the computer simulation of friction stir welding (FSW). In this paper, the flow stresses of the commercial 6061 aluminum alloy at the typical temperatures in FSW are investigated quantitatively by using hot compression tests. The typical temperatures during FSW are determined by reviewing the literature data. The measured data of flow stress, strain rate and temperature during hot compression tests are fitted to a Sellars–Tegart equation. An artificial neural network is trained to implement an accurate model for predicting the flow stress as a function of temperature and strain rate. Two models, i.e., the Sellars–Tegart equation and artificial neural network, for predicting the flow stress are compared. It is found that the root-mean-squared error (RMSE) between the measured and the predicted values are found to be 3.43 MPa for the model based on the Sellars–Tegart equation and 1.68 MPa for the model based on an artificial neural network. It is indicated that the artificial neural network has better flexibility than the Sellars–Tegart equation in predicting the flow stress at typical temperatures during FSW.

Mechanical Behavior and Microstructure Evolution during Hot Torsion Deformation of Aluminum Alloy AA2219

“…[ 33 ] Pronounced strain rate dependence in this intermediate strain rate regime for aluminum alloys has also been reported in hot compression and hot torsion experimental data. [ 2,4,39 ] Accordingly, a relatively high value of C in the Johnson–Cook model is obtained in the result of this study.…”

Extremely thin intermetallic layer in dissimilar AA6061-T6 and mild steel friction stir lap welding using a hemispherical tool

“…• τ y depends on the stirred material (AA6061) temperature, which has been approximated to 400 • C (based on measurement at similar welding conditions 27 ), and the flow stress at 400 • C is taken from 28 ; • tool tip completely in contact with aluminum, only rubbing the steel upper surface, with a plunge depth of 2.1 mm.…”