A Study of the Technique of LD11 Alloy in Isothermal Deformation
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The influence of the deformation temperature and strain rate on flow stress and microstructure was investigated by means of the constant strain rate isothermal compression experiment.The range of deformation temperature and strain rate of LD11 alloy in isothermal deformation was determined for the basis of the technique in isothermal deformation.Keywords:
Isothermal process
Flow stress
Strain (injury)
Atmospheric temperature range
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The high temperature flow behavior of 7A52 aluminum alloy during high temperature plastic deformation was studied by isothermal compression of cylindrical specimens using Gleeble-1500 thermal simulation machine.The results show that the flow stress decreases with the increase of deformation temperature and increases with the increase of strain rate.The flow stress equation of 7A52 alloy during temperature deformation can be represented by a formula.The better hot deformation processing can be designed at 400℃-420℃.
Flow stress
Isothermal process
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True stress-strain curves of plastic deformation for new Al-10Sn-4Si alloy have been tested by the isothermal compression process at high temperatures with Gleeble 1?500 machine,The flow stress of the compression process for the alloy has been investigated in the temperature range of 100～400 ℃ and the strain rate range of 1 0～0 001 s 1 .The results show that the plastic deformation process of the alloy have steady state flow characteristics and the flow stress is sensitive to strain rate.The flow stress hardly vareis in the period of steady state flow.The steady stress increased with increasing the strain rate and decreasing the temperature.The flow stress characteristics was closely related to dynamic recovery and re-crystallization and sticky flow of local grain boundary.The plastic flow was a thermally activated process ,which is governed by rate-controlling mechanism of dislocation.The steady flow stress equations were established by regression analysis.
Flow stress
Isothermal process
Isothermal flow
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The flow stress features of 01570 aluminum alloy were studied by constant temperature and rate compression at 360～480℃and strain rate of 0.001～ 1s-1 through Gleeble 1500 simulated machine.The results show that the flow stress is controlled by strain rate and deformation temperature.The flow stress decreases with deformation temperature increasing and increases with strain rate increasing.The flow stress of 01570 aluminum alloy tends to be constant after a peak value,which shows dynamic recovery.The flow stress of 01570 aluminum alloy during high temperature deformation can be represented by Zener-Hollomon parameter including the Arrhenius term.
Flow stress
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The hot plastic deformation behavior of C70250 alloy in the temperature range of 500～950℃ and strain rate range of 0.01～10s-1 was investigated by hot compressing test on a Gleeble-3500 imulator.The constitutive equation among stress temperature and strain rate was calculated according to the data of true stress-strain curve under various temperatures as well as different strain rates.The test results indicate that the suitable rolling temperature is between 700℃ and 950℃,and the strain rate is 0.1～10s-1
Strain (injury)
Atmospheric temperature range
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The thermal compression flow stress behavior of the hot compression deformation of Ti62421s alloy with reduction rate of 60% was studied under the deformation temperature range of 900-1 060 ℃ and strain rate range of 0.001-10 s-1.The effect of temperature and strain rate on hot deformation flow stress of Ti62421s was studied,and the constitutive model equations and processing maps of hot deformation flow stress of Ti62421s alloy were established.The results show that during hot compression process,the flow stress increases with the increase of strain,then gradually stabilizes after reaching peak stress.The phenomenon of discontinuous yielding appears under the high strain rate(10 s-1) deformation;the peak stress increases with the increase of strain rate and decreases with the increase of temperature;and the optimal deformation process parameters of the alloy are as follows: temperature is 980 ℃,strain rate is 0.01-0.1 s-1.
Flow stress
Atmospheric temperature range
Strain (injury)
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The hot deformation behavior of Mg-3.5Zn-0.6Y-0.5Zr alloy was investigated by compressive tests of strain rate ranges of 0.002~1 s-1 and deformation temperature ranges of 300~450 °C using a Gleeble 1500D thermal simulator. The flow stresses in different deformation conditions are measured. The results show that flow stress is significantly affected by both deformation temperature and strain rate, the flow stress increases with increase in strain rate and decreases in deformation temperature during the hot compression process. The constitutive equation established on the basis of data of activation energy and stress exponent is a hyperbolic sine function.
Flow stress
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7050 alloy at different strain rates,deformation temperature and reduction rate under the upsetting test was measured by thermal simulation testing machine Gleeble-1500.The true stress-true strain curve under different temperatures(250 ℃,325 ℃,400 ℃,475℃)and strain rate deformation(0.01,0.1,1,10 s-1) were obtained.The influence of thermoplastic deformation conditions on the alloy flow stress was studied.The results show that the lower the deformation temperature,and the higher the strain rate,the greater the flow stress.The flow stress at the initial stage of deformation increases with deformation increasing,which can reach the approximate steady state flow limit.The microstructure evolution of the alloy under high temperature thermoplastic deformation was studied by combining with metallurgical test methods and optical microscopy.The relationships between deformation parameters and microstructure evolution in the process of the thermoplastic deformation was analyzed by combining with pressure processing theory.The results confirm that changing the pressure temperature,reduction rate and pressure rate can effectively change the volume fraction of dynamic recrystallization and dynamic recrystallization grain size.The effect of reduction rate on the alloy dynamic recrystallization is obvious.Different dynamic recrystallization starting temperature corresponds to different amounts of deformation.
Dynamic Recrystallization
Flow stress
Recrystallization (geology)
Volume fraction
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The high temperature compression tests of Al-6.2Zn-2.3Mg-2.3Cu aluminum alloy at different temperature and strain rate were carried out on GPL-1500 thermal simulation testing machine.The true stress-strain curves are obtained.The equation of deformation activation energy and flow stress-strain is worked out.The results show that the flow stress is influenced by deformation temperature and strain rate obviously;the flow stress decreases greatly with increasing of temperature and increases with increasing of strain rate.The flow stress of this aluminum alloy during high temperature deformation can be described by Zener-hollomon parameter(Z).The flow stress equation of Arrhenius relation modified by hyperbolic sine function is e·=1.282×100[sin(0.010σ)]4.9145exp(-134157/RT).
Flow stress
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Flow stress
Isothermal process
Adiabatic shear band
Titanium alloy
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The flow stress evolution of TC11 titanium alloy during deformation at high temperature is studied in the temperature range of 760℃~960℃,strain rate range of 0.001~5.0s~(-1) and deformation degree of 50% on Gleebleo 1500 thermo-mechanical simulator.Based on the analysis of effect of deformation temperature,deformation degree and strain rate on the flow stress,the constitutive relational model of TC11 titanium alloy is obtained by regression of experimental data according to the Arrhenius equation.Thus,an important computational model for numerical simulation of TC11 titanium alloy during deformation at high temperature is provided.
Titanium alloy
Flow stress
Atmospheric temperature range
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