Flow stress behavior of porous FVS0812 aluminum alloy during hot-compression

2006 ◽  
Vol 33 (4) ◽  
pp. 508-514 ◽  
Author(s):  
Mei yan Zhan ◽  
Zhenhua Chen ◽  
Hui Zhang ◽  
Weijun Xia
Keyword(s):  
Aluminum Alloy ◽  
Flow Stress ◽  
Hot Compression ◽  
Stress Behavior ◽  
Flow Stress Behavior

scholarly journals Modeling Hot Deformation of 5005 Aluminum Alloy through Locally Constrained Regression Models with Logarithmic Transformations

2021 ◽  
Vol 12 (1) ◽  
pp. 152
Author(s):  
Jeongho Cho ◽  
Shin-Hyung Song
Keyword(s):  
Neural Network ◽  
Aluminum Alloy ◽  
Flow Stress ◽  
Hot Deformation ◽  
Regression Models ◽  
Temperature Deformation ◽  
Constrained Regression ◽  
Stress Behavior ◽  
Flow Stress Behavior ◽  
The Neural Network

This study presents the adoption of locally constrained regression models (LCRMs) with logarithmic transformations in order to model the flow stress behavior of the high-temperature deformation of 5005 aluminum alloy. Hot tensile tests for 5005 aluminum alloy were conducted under the temperatures of 290 °C, 360 °C, 430 °C, and 500 °C, and the strain rates of 0.0003/s, 0.003/s, and 0.03/s. The flow stress behavior was analyzed based on variations in temperature and strain rate. The flow stress during the hot deformation was modeled using the traditional Arrhenius type constitutive equation and the neural network approach. Then, for improved prediction accuracy, the flow stress was modeled using LCRMs. The prediction accuracies of the models were compared by calculating the MAE (Maximum Absolute Error) and RMSE (Root-Mean-Squared Errors) values. The MAE and RMSE of the LCRMs were lower than the errors of the Arrhenius equation and the neural network model. The results show that LCRMs can be useful in modeling the flow stress of 5005 aluminum alloy, and that the developed model can accurately predict the flow stress.

Influence of Microporosity Morphology on Hot Compression Behavior of 6063 Alloy

2013 ◽  
Vol 717 ◽  
pp. 67-73
Author(s):  
Xie Hua Li ◽  
Yi Heng Cao ◽  
Li Zi He ◽  
Ya Ping Guo ◽  
Jian Zhong Cui
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Compression Test ◽  
Hot Compression ◽  
Area Fraction ◽  
Isothermal Compression ◽  
Hollomon Parameter ◽  
Compression Behavior ◽  
Stress Behavior ◽  
Flow Stress Behavior

The influences of microporosity morphology on the flow stress behavior of 6063 alloy were investigated by isothermal compression test at 300°C-500°C and strain rate of 0.01-10s-1. After 60% compression, the area fraction of microporosity of sample having lage microporosity decreases obviously. The flow stress increases with increasing strain rate and decreasing temperature. The flow stress stress behavior of 6063 alloy during hot compression can be described by a Zener-Hollomon parameter including Arrhenius item. The increasing of area fraction of microporosity decreases the deformation activiation energy Q.

The Flow Stress Behavior and Constitutive Equation of Nanometric Al2O3 Particulate Reinforced Al Alloy Matrix Composites

2012 ◽  
Vol 628 ◽  
pp. 7-10 ◽  
Author(s):  
Zhi Min Zhang ◽  
Yong Biao Yang ◽  
Xing Zhang
Keyword(s):  
Flow Stress ◽  
Constitutive Equation ◽  
Strain Rate ◽  
Hot Compression ◽  
Al Alloy ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Stress Behavior ◽  
Flow Stress Behavior ◽  
Particulate Reinforced

The flow stress behavior and constitutive equation of the nanometric Al2O3particulate reinforced Al alloy matrix composites were investigated in the temperature range from 590k-710k, and at the strain rates range from 0.01s-1-1s-1. Hot compression tests were carried out with thermal simulation machine Gleeble-1500. The results showed that the values of the true stresses rose rapidly and then held constant to some extent after attaining the peak values with the increasing strains at different deformation condition. The flow stress for the composites increased with increasing strain rate, which means that the experimental material is a sensitive material of positive strain rate, and decreased with decreasing temperature. Dynamic recovery and dynamic recrystallization occurred during hot compression of the composites. The constitutive equation represented by a Zener-Hollomon parameter in an exponent-type and the deformation activation energy are as follows respectively: σ=71.43ln{(Z/4.37×1011)1/5.94+[(Z/4.37×1011)2/5.94+1]1/2}, Q=197KJ mol-1.

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