Hot Deformation Behaviour and Microstructure in Al-Cu-Li Alloy Containing Small Amount of Ag and Mg

2006 ◽  
Vol 519-521 ◽  
pp. 1925-1930 ◽  
Author(s):  
Zhi Guo Chen ◽  
Zi Qiao Zheng ◽  
Dong Feng Han
Keyword(s):  
Flow Stress ◽  
Hot Deformation ◽  
Deformation Temperature ◽  
Deformation Behaviour ◽  
Flow Characteristics ◽  
Hollomon Parameter ◽  
Transmission Electron ◽  
Deformation Behaviors ◽  
Hot Deformation Behaviour ◽  
Peak Value

The hot deformation behaviors and microstructure in Al-Cu-Li alloy containing small amount of Ag and Mg were investigated by transmission electron microscopy and isothermal compression tests.When the strain rate is 0.1, 0.01 and 0.001s-1(the deformation temperature within the range of 360-520􀀀 ) and 1 s-1(deformation temperature 520 􀀀 )respectively, the flow stress decreases after a peak value, showing dynamic recrystallization,while the steady-state flow characteristics exist on the other deformation conditions. The flow stress of Al-Cu-Li-Mg-Ag alloy during hot deformation can be expressed by a Zener-Hollomon parameter in the hyperbolic-sine function with the hot deformation activation energyDH of 250.45kJ/mol. The dislocations may climb with support from many vacancies generated during hot deformation, thus forming lots of helical dislocations. The dynamic precipitation and successive dynamic particles coarsening during hot compression have been assumed to be responsible for further flow softening when deformed at low strain rates.

scholarly journals Hot Deformation Behaviour of Mn–Cr–Mo Low-Alloy Steel in Various Phase Regions

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1255 ◽  
Author(s):  
Ivo Schindler ◽  
Petr Opěla ◽  
Petr Kawulok ◽  
Jaroslav Sojka ◽  
Kateřina Konečná ◽  
...  
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Behaviour ◽  
True Strain ◽  
Coarse Grained ◽  
Peak Strain ◽  
Compression Tests ◽  
Wide Range ◽  
Hot Deformation Behaviour

The deformation behaviour of a coarse-grained as-cast medium-carbon steel, alloyed with 1.2% Mn, 0.8% Cr and 0.2% Mo, was studied by uniaxial compression tests for the strain rates of 0.02 s−1–20 s−1 in the unusually wide range of temperatures (650–1280 °C), i.e., in various phase regions including the region with predominant bainite content (up to the temperature of 757 °C). At temperatures above 820 °C, the structure was fully austenitic. The hot deformation activation energies of 648 kJ·mol−1 and 364 kJ·mol−1 have been calculated for the temperatures ≤770 °C and ≥770 °C, respectively. This corresponds to the significant increase of flow stress in the low-temperature bainitic region. Unique information on the hot deformation behaviour of bainite was obtained. The shape of the stress-strain curves was influenced by the dynamic recrystallization of ferrite or austenite. Dynamically recrystallized austenitic grains were strongly coarsened with decreasing strain rate and growing temperature. For the austenitic region, the relationship between the peak strain and the Zener–Hollomon parameter has been derived, and the phenomenological constitutive model describing the flow stress depending on temperature, true strain rate and true strain was developed. The model can be used to predict the forming forces in the seamless tubes production of the given steel.

scholarly journals Flow Stress Modelling and 3D Processing Maps of Al4.5Zn4.5Mg1Cu0.12Zr Alloy with Different Scandium Contents

2021 ◽  
Vol 11 (10) ◽  
pp. 4587
Author(s):  
Maxim G. Khomutov ◽  
Andrey V. Pozdniakov ◽  
Alexander Yu. Churyumov ◽  
Ruslan Yu. Barkov ◽  
Alexey N. Solonin ◽  
...  
Keyword(s):  
Flow Stress ◽  
Deformation Behaviour ◽  
Three Dimensional ◽  
Processing Maps ◽  
Hollomon Parameter ◽  
Stability Diagrams ◽  
Power Dissipation Efficiency ◽  
3D Processing ◽  
Hot Deformation Behaviour ◽  
Flow Stress Model

The hot deformation behaviour of an Al4.5Zn4.5Mg1Cu0.12Zr based alloy with 0.05, 0.1 and 0.15% Sc was investigated at temperatures between 300–450 °C and a strain rate of 0.1–15 s−1. The materials constants of a flow stress model based on the Zener-Hollomon parameter were determined (AARE was 5.8%). Three-dimensional processing maps were established by combining power dissipation efficiency and flow stability diagrams. Based on processing maps analysis and microstructures investigations, the optimal deformation parameters were determined as a temperature range of 350–400 °C and strain rates of 0.1–1 s−1 for the alloys with 0.05% and 0.1% Sc, and 0.1 s−1 for the alloy with 0.15% Sc.

High Temperature Plastic Deformation Behavior of As-Cast 300M Steel Based on Friction Correction

2019 ◽  
Vol 815 ◽  
pp. 99-106
Author(s):  
Xiao Wei Xue ◽  
Chun Xu Wang ◽  
Yong Li ◽  
Shun Han ◽  
Shao Zun Liu ◽  
...  
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Deformation Temperature ◽  
Strain Rate Range ◽  
Hollomon Parameter ◽  
300M Steel ◽  
Plastic Deformation Behavior ◽  
Recrystallized Grain Size

Hot deformation behavior of as-cast 300M steel was investigated in the temperature range of 850-1200°C and strain rate range of 0.01-10 s-1 using Gleeble-3800 thermo-mechanical simulator. Based on the true stress-strain curves corrected for friction, flow stress behavior and deformation mechanism were analyzed, and the constitutive model of as-cast 300M steel was established based on the Arrhenius model and Zener-Hollomon parameter (Z). The microstructure after deformation was observed by Olympus GX51 microscope. The experimental results show that the flow stress of as-cast 300M steel decrease with the increase of deformation temperature and the decline of strain rate. The dynamic recrystallization is more likely to occur at higher temperatures and lower strain rates. By regression analysis, the hot deformation activation energy (Q) of the as-cast 300M steel was calculated to be 360.332 kJ/mol. Microstructure evolution is greatly affected by deformation temperature and strain rate. The dynamic recrystallized grain size increases with the enhancement of deformation temperature and the decrease of strain rate.

Hot Deformation Behavior of Al-Zn-Mg-Zr Alloy with Trace Amounts of Sc

2013 ◽  
Vol 634-638 ◽  
pp. 1740-1745
Author(s):  
Bo Li ◽  
Qing Lin Pan ◽  
Chen Li ◽  
Yan Fang Song ◽  
Zhi Ye Zhang
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Temperature ◽  
Flow Behavior ◽  
Temperature Deformation ◽  
Simulation Test ◽  
Hollomon Parameter ◽  
Deformation Activation Energy ◽  
Zr Alloy

The flow behavior of Al-Zn-Mg-Sc-Zr alloy during hot compression deformation was studied by thermal simulation test at strain rate of 0.001 to 10s-1 and deformation temperature of 340 to 500°C on the Gleeble-1500 thermal mechanical simulator. The results show that the flow stress increases with increasing strain rate, and decreases with increasing deformation temperature. The flow stress of the alloy during the elevated temperature deformation can be represented by a Zener-Hollomon parameter with the inclusion of the Arrhenius term. The values of A, n, α in the analytical expression of flow stress are fitted to be 1.49×1010s−1, 7.504 and 0.0114MPa−1, respectively. The hot deformation activation energy of the alloy during hot deformation is 150.25kJ/mol.

scholarly journals Hot-deformation behaviour and flow-stress prediction of the TC4 alloy considering strain

2019 ◽  
Vol 53 (1) ◽  
pp. 65-70 ◽  
Author(s):  
F. Han ◽  
Y. Wang ◽  
R. Chen ◽  
Q. Gao ◽  
Y. Wang ◽  
...  
Keyword(s):  
Flow Stress ◽  
Hot Deformation ◽  
Deformation Behaviour ◽  
Tc4 Alloy ◽  
Stress Prediction ◽  
Hot Deformation Behaviour

Hot deformation behaviour of Ni–30Fe–C and Ni–30Fe–Nb–C model alloys

2015 ◽  
Vol 641 ◽  
pp. 160-171 ◽  
Author(s):  
Parvez Mannan ◽  
Andrii G. Kostryzhev ◽  
Hatem Zurob ◽  
Elena V. Pereloma
Keyword(s):  
Hot Deformation ◽  
Deformation Behaviour ◽  
Hot Deformation Behaviour

Analysis of Hot Deformation Dynamics of TC18 Titanium Alloy

2013 ◽  
Vol 747-748 ◽  
pp. 878-884 ◽  
Author(s):  
Qing Rui Wang ◽  
Ai Xue Sha ◽  
Xing Wu Li ◽  
Li Jun Huang
Keyword(s):  
Titanium Alloy ◽  
Phase Transformation ◽  
Flow Stress ◽  
Strain Rate ◽  
Hot Deformation ◽  
Deformation Temperature ◽  
Relationship Model ◽  
Deformation Dynamics ◽  
Deformation Mechanics ◽  
Versus Strain

The effect of strain rate and deformation temperature on flow stress of TC18 titanium alloy was studied through heat simulating tests in 760~960 with temperature interval and the strain rate interval in 0.01~10s-1. Relationship model of flow stress versus strain was established and hot deformation mechanics of TC18 titanium alloy was analyzed. The results show that the flow stress reduces obviously as the deformation temperature increases or the strain rate decreases. Dynamic recovery occurs at high strain rate above phase transformation point, while dynamic recrystallization occurs at low strain rate as well as at the temperature below phase transformation point.

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