Static recrystallization kinetics and microstructure evolution of 7055 aluminum alloy

2019 ◽  
Vol 116 (1) ◽  
pp. 120
Author(s):  
Tao Zhang ◽  
Lei Li ◽  
Shihong Lu ◽  
Zhengfang Li ◽  
Peng Chen ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Flow Stress ◽  
Microstructure Evolution ◽  
Static Recrystallization ◽  
Large Strain ◽  
Processing Parameters ◽  
Temperature Sensitive ◽  
Sensitive Material ◽  
Interval Time ◽  
7055 Aluminum Alloy

In order to acquire flow characteristics in multi-pass hot plastic deformation and the optimized processing parameters for 7055 aluminum alloy, the double-pass hot compressive flow stress behavior was studied at the temperatures from 300 to 420 °C, the strain from 0.2 to 0.4 and the pass interval time from 10 to 100s on Gleeble-3180 thermo-simulation machine. The static recrystallization (SRX) kinetics and grain size model of 7055 aluminum alloy were acquired by regression analysis. The metallographic tests were conducted and the effects of pass interval time, temperature and strain on microstructure evolution of SRX were analyzed. The results show that 7055 aluminum alloy is temperature sensitive material and the yield flow stress decreases with ascending temperature and pass interval time. Large strain, high temperature and long pass interval time are beneficial to larger SRX fraction and grain refinement. The investigation of flow characteristic and microstructure evolution can be a guidance to acquire optimized processing parameters for multi-pass hot deformation of 7055 aluminum alloy.

Dynamic recrystallization kinetics and microstructure evolution of 7055 aluminum alloy during hot compression

2019 ◽  
Vol 116 (6) ◽  
pp. 605
Author(s):  
Tao Zhang ◽  
Huapu Sha ◽  
Lei Li ◽  
Shihong Lu ◽  
Hai Gong
Keyword(s):  
Aluminum Alloy ◽  
High Temperature ◽  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Grain Refinement ◽  
Microstructure Evolution ◽  
Large Strain ◽  
Small Strain ◽  
Small Strain Rate ◽  
7055 Aluminum Alloy

7055 aluminum alloy is widely used in manufacture of key components in fields of aerospace. Hot forming is the vital process for manufacture of components. Dynamic recrystallization (DRX) plays a significant role in grain refinement. Hot compressions and metallographic tests are conducted. Equations of DRX kinetics are fitted by least square method and finite element models (FEM) coupled with DRX kinetics equations are established to study the effects of forming parameters on microstructure evolution. The results show that true stress increases with ascending strain rate and decreases with ascending temperature. Large strain, small strain rate and high temperature are beneficial to sufficient DRX fraction and grain refinement. Deformation energy and thermally activated motion of atoms and molecules resulting from large strain and high temperature contribute to dynamic nucleation; meanwhile, small strain rate provides sufficient time for growth of recrystallized grains. The FEM results agree with experiments.

Flow behavior and microstructure evolution of 7055 aluminum alloy impacted at high strain rates

2016 ◽  
Vol 677 ◽  
pp. 203-210 ◽  
Author(s):  
Shengdan Liu ◽  
Shaoling Wang ◽  
Lingying Ye ◽  
Yunlai Deng ◽  
Xinming Zhang
Keyword(s):  
Aluminum Alloy ◽  
Microstructure Evolution ◽  
High Strain ◽  
Flow Behavior ◽  
Strain Rates ◽  
High Strain Rates ◽  
7055 Aluminum Alloy

Modeling the Hot Deformation Behavior of 1565ch Aluminum Alloy

2016 ◽  
Vol 684 ◽  
pp. 35-41 ◽  
Author(s):  
S.V. Rushchits ◽  
E.V. Aryshensky ◽  
S.M. Sosedkov ◽  
A.M. Akhmed'yanov
Keyword(s):  
Aluminum Alloy ◽  
Flow Stress ◽  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Static Recrystallization ◽  
Strain Rates ◽  
Strain Resistance ◽  
Hot Deformation Behavior ◽  
Zirconium Addition

The deformation behavior of 1565ch alloy under the plane-strain conditions in the temperature range of 350–490 оС and strain rates range of 0,1–10 s-1 is studied. The expression for steady flow stress as the functions of temperature of deformation and strain rate is obtained. It is established that 1565ch alloy with zirconium addition shows higher strain resistance and less tendency to dynamic and static recrystallization than AMg6.

Preparation of Semi-Solid Billet with Less Liquid Content of 7A09 Aluminum Alloy by Partial-Melting Method

2009 ◽  
Vol 79-82 ◽  
pp. 1795-1798
Author(s):  
Wei Wei Wang ◽  
Jian Li Song ◽  
Jing Bo Yu
Keyword(s):  
Aluminum Alloy ◽  
Optical Microscopy ◽  
Partial Melting ◽  
Microstructure Evolution ◽  
Processing Parameters ◽  
Liquid Content ◽  
Melting Method ◽  
Wide Range ◽  
Fine Microstructure ◽  
Semi Solid

Preparation of semi-solid microstructure with less liquid content of 7A09 aluminum alloy industrial extrusion billets is studied in this paper. In the treatment, melting-stirring and predeformation of the alloy billets are not required. The influences of different heating temperatures and insulation time on the microstructure evolution are studied and the obtained microstructure is observed and analyzed by optical microscopy. The results indicate that a fine microstructure can be obtained with the proposed process and the processing parameters can be controlled over a wide range. The liquid content can be controlled within a certain range.

Microstructure evolution of ultrafine grained aluminum alloy prepared by large strain extrusion machining during annealing

2019 ◽  
Vol 6 (11) ◽  
pp. 116550
Author(s):  
Zihan Zhou ◽  
Bangxian Wu ◽  
Haitao Chen ◽  
Baoyu Zhang ◽  
Wenjun Deng
Keyword(s):  
Aluminum Alloy ◽  
Microstructure Evolution ◽  
Large Strain ◽  
Ultrafine Grained

Artificial Neural Network Models for Predicting Flow Stress and Microstructure Evolution of a Hydrogenized Titanium Alloy

2007 ◽  
Vol 353-358 ◽  
pp. 541-544 ◽  
Author(s):  
Qing Wang ◽  
J. Lai ◽  
Dong Li Sun
Keyword(s):  
Neural Network ◽  
Flow Stress ◽  
Microstructure Evolution ◽  
Back Propagation ◽  
Network Models ◽  
Simulation Models ◽  
Processing Parameters ◽  
Neural Network Models ◽  
Different Temperatures ◽  
Artificial Neural Network Models

The effects of hydrogen contents and processing parameters of hot deformation on a Ti-6Al-2Zr-1Mo-1V alloy were investigated. Hot compressive tests were conducted at different temperatures and strain rates with various hydrogen contents. Based on these experimental data, the simulation models for predicting flow stress and microstructure evolution have been built by back propagation (BP) neural network. The numerical results gained via the networks were compared with the experimental results.

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