scholarly journals The Hot Deformation Activation Energy of 7050 Aluminum Alloy under Three Different Deformation Modes

Metals ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 49 ◽  
Author(s):  
Deli Sang ◽  
Ruidong Fu ◽  
Yijun Li
Keyword(s):  
Activation Energy ◽  
Aluminum Alloy ◽  
Hot Deformation ◽  
7050 Aluminum Alloy ◽  
Deformation Activation Energy ◽  
Deformation Modes

scholarly journals Hot Compression Deformation and Activation Energy of Nanohybrid-Reinforced AZ80 Magnesium Matrix Composite

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 119 ◽  
Author(s):  
Houyi Li ◽  
Lingling Fan ◽  
Mingyang Zhou ◽  
Youlong Zhou ◽  
Kuan Jiang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Strain Rate ◽  
Matrix Composite ◽  
Hot Deformation ◽  
Strain Rates ◽  
Magnesium Matrix ◽  
Deformation Activation Energy ◽  
Deformation Behaviors ◽  
Carbon Nano Tubes ◽  
Deformation Test

The hot deformation test of the nano silicon carbide (nano-SiC) and carbon nano tubes (CNT) hybrid-reinforced AZ80 matrix composite was performed at compression temperatures of 300–450 °C and strain rates of 0.0001–1 s−1. It could be observed that the flow stress of the nanocomposite rose with the reduction of deformation temperature and the increase of strain rate. The hot deformation behaviors of the composite could be described by the sine-hyperbolic Arrhenius equation, and deformation activation energy (Q) was calculated to be 157.8 kJ/mol. The Q values of the extruded nanohybrid/AZ80 composite in this study and other similar studies on extruded AZ80 alloys were compared in order to analyze the effect of the addition of reinforcement, and the effects of deformation conditions on activation energy were analyzed. Finally, the compression microstructure in an unstable condition was carefully analyzed, and results indicated that the phenomenon of local instability was easy to occur at the compression specimen of the nanohybrid/AZ80 composite under deformation conditions of low temperature with high strain rate (300 °C, 0.1–0.01 s−1), and high temperature with low strain rate (450 °C, 0.0001 s−1).

Research on Hot Deformation Behavior of 3003 Al Alloy Prepared by Different Melt-Treatment Methods

2011 ◽  
Vol 66-68 ◽  
pp. 1611-1616 ◽  
Author(s):  
Gui Qing Chen ◽  
Gao Sheng Fu ◽  
Hong Ling Chen ◽  
Wen Duan Yan ◽  
Chao Zeng Cheng ◽  
...  
Keyword(s):  
Activation Energy ◽  
Strain Rate ◽  
Hot Deformation ◽  
Critical Conditions ◽  
Al Alloy ◽  
Hot Plastic Deformation ◽  
Treatment Methods ◽  
Melt Treatment ◽  
Deformation Activation Energy ◽  
Work Hardening Rate

3003 Al alloy with different metallurgical quality were obtained by different melt-treatment methods, which were deformed by isothermal compression in the range of deformation temperature 300-500°C at strain rate 0.0l-10.0 s-1 with Gleeble-1500 thermal simulator. The results show that the material is sensitive to positive strain rate. The hot deformation activation energy (Q) bears linear relationship with inclusion content (H) of 3003 Al alloy prepared by different melt-treatment, Q=35.62 H+171.58, the activation energy of 3003 Al alloy prepared by high melt-treatment is the lowest (174.62 KJ×mol-1), which is beneficial to the material hot plastic deformation. The critical strain of 3003 Al alloy prepared by different melt-treatment methods is investigated through the work hardening rate. Finally, the critical conditions of the investigated alloy were determined to predict the dynamic recrystallization occurrence in the paper.

Microstructure evolution of 7050 aluminum alloy during hot deformation

2010 ◽  
Vol 20 (2) ◽  
pp. 189-194 ◽  
Author(s):  
Jun-peng LI ◽  
Jian SHEN ◽  
Xiao-dong YAN ◽  
Bai-ping MAO ◽  
Liang-ming YAN
Keyword(s):  
Aluminum Alloy ◽  
Microstructure Evolution ◽  
Hot Deformation ◽  
7050 Aluminum Alloy

Hot Deformation Behavior of a New-Generation 980 MPa Grade TRIP Steel for Automobiles

2011 ◽  
Vol 261-263 ◽  
pp. 775-779 ◽  
Author(s):  
Xiao Ying Hou ◽  
Yun Bo Xu ◽  
Di Wu
Keyword(s):  
Activation Energy ◽  
Regression Analysis ◽  
Dynamic Recrystallization ◽  
Hot Deformation ◽  
Trip Steel ◽  
Deformation Behavior ◽  
Critical Stress ◽  
Hot Deformation Behavior ◽  
Deformation Activation Energy ◽  
New Generation

Using a Gleeble 1500 thermo-mechanical simulator, the behavior of the dynamic recrystallization (DRX) of a low-silicon TRIP steel containing phosphorus and vanadium for automobiles is studied systematically. By the analysis of ture stress-strain curves, critical stress(σc) and strain(εc) are determined at different deformation conditions. The deformation activation energy Qdef is 323 kJ/mol. The ratios of εc/εp and σc/σp of the tested TRIP steel are 0.553 and 0.89, respectively. The equation for describing the Zener–Hollomn formula for tested steel is derived. A linear equation between σc, σp, εc, εp and lnZ have been established through regression analysis, respectively.

scholarly journals Flow Stress and Hot Deformation Activation Energy of 6082 Aluminium Alloy Influenced by Initial Structural State

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1248 ◽  
Author(s):  
Ivo Schindler ◽  
Petr Kawulok ◽  
Vladivoj Očenášek ◽  
Petr Opěla ◽  
Rostislav Kawulok ◽  
...  
Keyword(s):  
Activation Energy ◽  
Flow Stress ◽  
Strain Rate ◽  
Aluminium Alloy ◽  
Hot Deformation ◽  
True Strain ◽  
Initial Structure ◽  
Compression Tests ◽  
Deformation Activation Energy ◽  
Q Values

Stress-strain curves of the EN AW 6082 aluminium alloy with 1.2 Si-0.51 Mg-0.75 Mn (wt.%) were determined by the uniaxial compression tests at temperatures of 450–550 °C with a strain rate of 0.5–10 s−1. The initial structure state corresponded to three processing types: as-cast structure non-homogenized or homogenized at 500 °C, and the structure after homogenization and hot extrusion. Significantly higher flow stress appeared as a result of low temperature forming of the non-homogenized material. Hot deformation activation energy Q-values varied between 99 and 122 kJ·mol−1 for both homogenized materials and from 200 to 216 kJ·mol−1 for the as-cast state, while the Q-values calculated from the measured steady-state stress were always higher than those calculated from the peak stress values. For the extruded state of the 6082 alloy, the physically-based model was developed to reliably predict the flow stress influenced by dynamic softening, temperature, strain rate, and true strain up to 0.6.

Characterization of Hot Deformation Behavior of Zr-1.0Sn-0.3Nb-0.3Fe-0.1Cr Using Processing Map

2013 ◽  
Author(s):  
B. F. Luan ◽  
R. S. Qiu ◽  
Z. Zhou ◽  
K. L. Murty ◽  
J. Zhou ◽  
...  
Keyword(s):  
Activation Energy ◽  
Flow Stress ◽  
Dynamic Recrystallization ◽  
Strain Rate ◽  
Hot Deformation ◽  
True Strain ◽  
Compression Testing ◽  
Strain Rates ◽  
Processing Maps ◽  
Deformation Activation Energy

Hot deformation characteristics of forged and β-quenched Zr-1.0Sn-0.3Nb-0.3Fe-0.1Cr (N18 alloy) in the temperature range 625–950°C and in the strain rate range 0.005–5 s−1 have been studied by uniaxial compression testing of Gleeble 3500. For this study, the approach of processing maps has been adopted and their interpretation done using the Dynamic Materials Model (DMM). Based on a series of true stress-true strain curves on various temperatures and strain rates, the flow stress has been summarized and both the strain rate sensitivity index (m) and deformation activation energy (Q) have been calculated by the constitutive equations that flow stress and the relationship of Z parameter and flow stress have been established subsequently. Furthermore, the efficiency of power dissipation (⬜) given by [2m/(m+1)] and improved by Murty has been plotted as a function of temperature and strain rate to obtain different processing maps at different true strain rates ranging from 0.1–0.7. Subsequently, the microstructures of the specimens after compression testing were characterized by electron channeling contrast (ECC) imaging techniques used an FEI Nova 400 field emission gun scanning electron microscopy (FEG-SEM). The results showed that: (i) The hyperbolic sine constitutive equation can describe the flow stress behavior of zirconium alloy, and the deformation activation energy and flow stress equation were calculated under the different temperature stages which insists that the deformation mechanism is not dynamic recovery. (ii) The hot processing maps and its validation were analyzed, which indicated that the DMM theory was reliable and could be adopted as useful tool for optimizing hot workability of Zr. The optimum parameters for extrusion and hammer forging were revealed on the processing maps of 830–950°C, 0.048–2.141 s−1 and 916–950°C, 2.465–5 s−1. (iii) The microstructure of the ingot exhibits a typical lamellar Widmanstatten structure. Under the different strain rates, the grains formed by dynamic recrystallization existed normally in the central zone of the compression samples while the no uniformity of grain size increased with the increasing of strain rate. Meanwhile, due to the dynamic recrystallization as a thermal activation process, the grains size and uniformity increased with the increasing of temperature. In brief, microstructure analysis showed that continuous dynamic recrystallization and geometric dynamic recrystallization operated concurrently during the isothermal compressive deformation.

scholarly journals Hot deformation activation energy of a 5E83 alloy prepared with centrifugal casting

2021 ◽  
Vol 1885 (3) ◽  
pp. 032033
Author(s):  
Xiaoming Qian ◽  
Yu Zhang ◽  
Zhaodong Wang ◽  
Yong Li ◽  
Jiadong Li
Keyword(s):  
Activation Energy ◽  
Hot Deformation ◽  
Centrifugal Casting ◽  
Deformation Activation Energy
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