Study on the hot deformation behaviors of Al-Zn-Mg-Cu-Cr aluminum alloy

2008 ◽  
Vol 21 (2) ◽  
pp. 109-115 ◽  
Author(s):  
G LIN ◽  
Z ZHANG ◽  
H ZHANG ◽  
D PENG ◽  
J ZHOU
Keyword(s):  
Aluminum Alloy ◽  
Hot Deformation ◽  
Deformation Behaviors

Hot Deformation Behaviors and Processing Maps of 2024 Aluminum Alloy in As-cast and Homogenized States

2015 ◽  
Vol 24 (12) ◽  
pp. 5002-5012 ◽  
Author(s):  
Liang Chen ◽  
Guoqun Zhao ◽  
Jie Gong ◽  
Xiaoxue Chen ◽  
Mengmeng Chen
Keyword(s):  
Aluminum Alloy ◽  
Hot Deformation ◽  
Processing Maps ◽  
2024 Aluminum Alloy ◽  
Deformation Behaviors

Modeling the Hot Deformation Behaviors of As-Extruded 7075 Aluminum Alloy by an Artificial Neural Network with Back-Propagation Algorithm

2017 ◽  
Vol 36 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Guo-zheng Quan ◽  
Zhen-yu Zou ◽  
Tong Wang ◽  
Bo Liu ◽  
Jun-chao Li
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Aluminum Alloy ◽  
Strain Rate ◽  
Hot Deformation ◽  
Back Propagation ◽  
Bp Algorithm ◽  
7075 Aluminum Alloy ◽  
Ann Model ◽  
Deformation Behaviors

AbstractIn order to investigate the hot deformation behaviors of as-extruded 7075 aluminum alloy, the isothermal compressive tests were conducted at the temperatures of 573, 623, 673 and 723 K and the strain rates of 0.01, 0.1, 1 and 10 s−1 on a Gleeble 1500 thermo-mechanical simulator. The flow behaviors showing complex characteristics are sensitive to strain, strain rate and temperature. The effects of strain, temperature and strain rate on flow stress were analyzed and dynamic recrystallization (DRX)-type softening characteristics of the flow behaviors with single peak were identified. An artificial neural network (ANN) with back-propagation (BP) algorithm was developed to deal with the complex deformation behavior characteristics based on the experimental data. The performance of ANN model has been evaluated in terms of correlation coefficient (R) and average absolute relative error (AARE). A comparative study on Arrhenius-type constitutive equation and ANN model for as-extruded 7075 aluminum alloy was conducted. Finally, the ANN model was successfully applied to the development of processing map and implanted into finite element simulation. The results have sufficiently articulated that the well-trained ANN model with BP algorithm has excellent capability to deal with the complex flow behaviors of as-extruded 7075 aluminum alloy and has great application potentiality in hot deformation processes.

Tensile Deformation Behaviors of Aluminum Alloy 2219 at High Temperatures from 415°C to 515°C

2018 ◽  
Vol 385 ◽  
pp. 403-406
Author(s):  
Xin Li ◽  
Tian Gan ◽  
Zhong Qi Yu ◽  
Yi Xi Zhao
Keyword(s):  
Aluminum Alloy ◽  
Hot Deformation ◽  
Tensile Deformation ◽  
Rate Sensitivity ◽  
Tensile Tests ◽  
Sensitivity Coefficient ◽  
Uniaxial Tensile ◽  
Deformation Behaviors ◽  
Temperature Ranges ◽  
Aluminum Alloy 2219

This study is carried out to provide detailed hot deformation information on aluminum alloy AA2219-O. The uniaxial tensile tests are carried out to study the hot deformation behaviors. The test temperature ranges from 415°C to 515°C, and the strain rates are 0.001s-1 and 0.01s-1. Additionally, the analysis of the strain rate sensitivity coefficient indicates that the AA2219-O exhibits the trend of superplasticity at temperatures above 475°C.

Constitutive Equation and Dynamic Softening Behavior of 7A55 Aluminum Alloy during Compression at Elevated Temperatures

2017 ◽  
Vol 898 ◽  
pp. 291-299
Author(s):  
Di Feng ◽  
Xin Ming Zhang ◽  
Sheng Dan Liu
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Equation ◽  
Strain Rate ◽  
Hot Deformation ◽  
Elevated Temperatures ◽  
Boundary Migration ◽  
Compression Tests ◽  
Softening Mechanism ◽  
Softening Behavior ◽  
Deformation Behaviors

The hot deformation behaviors of 7A55 aluminum alloy were investigated by compression tests at temperatures ranging from 270°C to 450°C and strain rate ranging from 0.1s−1 to 25s−1. Tha rResults show that the flow stress increased with increasing strain rate and decreasing temperature. A two-stage constitutive equation was established and the hot deformation activation energy was 140 kJ/mol. EBSD observations show that the fine and equiaxed grains with the misorientation angle above 15° nucleated at the initial grain boundaries under high temperature and low strain rate conditions. It is concluded that the softening mechanism of 7A55 aluminum alloy is dynamic recovery (DRV), together with a partial dynamic recrystallization (DRX). The nucleation mechanism of DRX could be explained by the strain induced grain boundary migration (SIBM). The DRX softening model was established based on the dislocation density theory finally.

Material Constants of Ferritic Spheroidal Cast Iron during Hot Deformation

2008 ◽  
Vol 575-578 ◽  
pp. 164-168 ◽  
Author(s):  
Xin Zhao
Keyword(s):  
Cast Iron ◽  
Strain Rate ◽  
Hot Deformation ◽  
Flow Curves ◽  
Material Constants ◽  
Thermally Activated ◽  
Straight Line ◽  
Deformation Behaviors ◽  
Gleeble 3500 ◽  
Joint Laboratory

The hot deformation behaviors of a ferritic spheroidal cast iron (FSCI) have been investigated by compression testing on a Gleeble 3500 machine of the DSI-YSU Joint Laboratory. The temperature rang was from 1073K to 1273K and strain rate from 10-3 to 1 s-1. The total true stain was 0.7. The result shows that the flow curves obtained are typical of dynamic recrystallization processes. The plots of either the natural logarithms of the corresponding temperature or the natural logarithms of strain rate against the hyperbolic of flow stresses satisfy straight line relationships over the experimental data, indicating that the hot compression of the FSCI is thermally activated. The material constants, including activation energy 0H as 240.8 kJ/mol, stress-level coefficient α as 1.352×10-8 Pa-1, stress exponential n as 3.9937, structural factor A as 5.64×108 s-1, are derived .

Compressive Deformation Behaviors of Aluminum Alloy in a SHPB Test

2012 ◽  
Vol 36 (6) ◽  
pp. 617-622 ◽  
Author(s):  
Jong-Tak Kim ◽  
Sung-Choong Woo ◽  
Jin-Young Kim ◽  
Tae-Won Kim
Keyword(s):  
Aluminum Alloy ◽  
Compressive Deformation ◽  
Deformation Behaviors ◽  
Shpb Test

scholarly journals Hot Deformation Behavior and Microstructure Evolution of 6063 Aluminum Alloy Modified by Rare Earth Y and Al-Ti-B Master Alloy

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4244 ◽  
Author(s):  
Wanwu Ding ◽  
Xiaoxiong Liu ◽  
Xiaoyan Zhao ◽  
Taili Chen ◽  
Haixia Zhang ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Rare Earth ◽  
Dynamic Recrystallization ◽  
Master Alloy ◽  
Hot Deformation ◽  
True Strain ◽  
Constitutive Models ◽  
Hot Workability ◽  
Continuous Dynamic Recrystallization ◽  
6063 Aluminum Alloy

The hot deformation behaviors of the new 6063 aluminum alloy modified by rare earth Y and Al-Ti-B master alloy were studied through isothermal hot compression experiments on the Gleeble-3800 thermal simulator. By characterizing the flow curves, constitutive models, hot processing maps, and microstructures, we can see from the true stress–true strain curves that the flow stress decreases with the increase of deformation temperature and the decrease of strain rate. Through the calculation of the constitutive equation, we derived that the activation energy of the new composite modified 6063 aluminum alloy is 224.570 KJ/mol. we roughly obtained its excellent hot processing range of temperatures between 470–540 °C and the strain rates of 0.01–0.1 s−1. The verification of the deformed microstructure shows that with the decrease of lnZ, the grain boundary changes from a low-angle one to a high-angle one and the dynamic recrystallization is dominated by geometric dynamic recrystallization and continuous dynamic recrystallization. Analysis of typical samples at 480 °C/0.01 s−1 shows that the addition of rare earth Y mainly helps form Al3Y5 and AlFeSiY phases, thus making the alloy have the performance of high-temperature recrystallization, which is beneficial to the hot workability of the alloy.

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