Effect of temperature and strain rate on hot deformation behavior and microstructure of Al-Cu-Li alloy

Nayan, Nafarizal; Murty, S. V. S. Narayana; Chhangani, Sumit; Prakash, Aditya; Prasad, M.J.N.V.; Samajdar, I.

doi:10.1016/j.jallcom.2017.06.165

Cited by 67 publications

(16 citation statements)

References 26 publications

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“…Coarse grains with a uniform distribution were surrounded by fine equiaxed grains. These features indicate the occurrence of steady DRX [23]. It is confirmed that Point A is located in the stable region.…”

Section: Analysis Of Processing Mapssupporting

confidence: 62%

“…9c. Nayan et al [23] obtained a similar variation trend in their study and assumed that adiabatic temperature rise (ATR) facilitates the occurrence of DRX at high deformation temperature and high strain rate. Because the high kinetic energy of the atoms caused by ATR promotes rapid nucleation and growth of new strain-free grains via reconstitution of the microstructure.…”

Section: Microstructure Evolutionmentioning

confidence: 57%

“…The gradual increases in the KAM and GOS values at 560°C and _ e\0:1 s À1 . Figure 9c indicates the increase in dislocation content, especially the number of geometrically necessary dislocations in the structure, with increasing strain rate [23]. However, at 560°C and _ e [ 0:1 s À1 , a gradually increasing fraction of DRX with increasing strain rate caused a decrease in the overall dislocation density inside the grains due to the formation of new strain-free grains.…”

Section: Microstructure Evolutionmentioning

confidence: 95%

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Hot workability and microstructure evolution of Al–0.2Sc–0.04Zr alloy

et al. 2019

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Hot deformation behavior of Al-0.2Sc-0.04Zr (wt.%) aluminum alloy was investigated via conducting hot compression tests at temperatures of 440-600°C and at strain rates, ranging from 0.001 to 5 s-1 , at an interval of an order of magnitude. The characteristics of the true stress-strains acquired in the hot compression tests were investigated, and the influence of processing parameters on the microstructure of the deformed samples was observed by using optical microscope and electron back-scattered diffraction (EBSD). Two types of processing maps for Al-0.2Sc-0.04Zr alloy were developed using the Kumar-Prasad (K-P) and Murty-Rao (M-R) instability/stability criteria, respectively. The prediction results of two types of processing maps were examined. Based on the analysis of the M-R processing map and EBSD, a deformation mechanism map covering a wide range of temperature and strain rate was developed. The result shows that the flow stress had a rapid increase to the maximum stress, and subsequently, the flow stress decreases continually to be of steady-state type when the deformation continues on. The M-R criterion can more accurately predict the unstable region than the K-P criterion. The optimum temperature T and strain rate _ e combination conditions for Al-0.2Sc-0.04Zr alloy are T = 520-560°C, _ e = 10-3 s-1 or _ e = 0.1-5 s-1. The microstructure evolution dominated by the predominant or complete dynamic recrystallization can be acquired by deformation at the combination conditions. However, it is dominated mainly by dynamic recovery at lower temperatures (T \ 520°C) and by dynamic recrystallization at higher temperatures (T [ 520°C). In addition, the microstructure of specimen deformed at 600°C shows a growing and coarse trend. Moreover, the nano-dimension precipitate particles of Al 3 (Sc,Zr) are uniformly distributed throughout Al matrix. The efficiency parameter g value of Al-0.2Sc-0.04Zr alloy in processing maps is smaller in comparison with that in pure aluminum, and it could be attributed to these nano-dimension particles.

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Section: Analysis Of Processing Mapssupporting

confidence: 62%

Section: Microstructure Evolutionmentioning

confidence: 57%

Section: Microstructure Evolutionmentioning

confidence: 95%

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Hot workability and microstructure evolution of Al–0.2Sc–0.04Zr alloy

et al. 2019

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“…On the basis of the dynamic material model (DMM) theory, the processing map built by N. Nayan et al 18 have been widely used as an important tool to analyze the hot-deformation behavior and optimize the hot-working processes. First, the processing map can combine the continuous plastic flow with the microstructure evolution and, secondly, it can be used to describe the dynamic response area during hot deformation.…”

Section: Processing Mapmentioning

confidence: 99%

Constitutive equations and processing map for hot deformation of a Ti-6Al-4V alloy prepared with spark-plasma sintering

Wu¹,

Liu²,

Xu³

et al. 2020

Mater. Tehnol.

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High-temperature flow behaviors of a spark-plasma-sintered Ti-6Al-4V alloy was studied at a temperature range of 850-1050°C and a strain rate of 0.001-5 s-1 on a Gleeble-1500D simulator. The true stress-strain curve of the alloy deformed at the total strain of about 70 % was studied. The results show that the flow stress increased as the deformation temperature decreased and the strain rate increased. Based on an Arrhenius-type equation, a constitutive equation was established. In the constitutive equation, the strain has a significant influence on the material parameters, and the relationships between the material parameters and strain are incorporated with a fine polynomial fitting. So, the flow stress is regarded as the function of the deformation parameters such as strain, strain rate and deformation temperature. The average activation energy for the hot deformation of the spark-plasma-sintered Ti-6Al-4V alloy was 425.581 kJ/mol. Meanwhile, hot-processing maps were established based on dynamic material modeling to obtain the regular pattern of the influence of the processing parameters on deformation. The results show that the effects of deformation temperature, strain rate and strain on the peak-dissipation efficiency factor and the instability range are extremely significant. With an increase in the strain, the peak-dissipation efficiency factor increases and the flow-instability range gradually decreases. The optimum deformation temperature and strain rate for hot working of the spark-plasma-sintered Ti-6Al-4V alloy are 950-1000°C and 1-5 s-1 , respectively.

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“…During hot deformation of materials, relations among temperature, strain rate and flow or peak stress of a material can be expressed as [15,[46][47][48][49][50][51] A exp when 0.8 , 1…”

Section: Constitutive Equations Of Flow Stressmentioning

confidence: 99%

Hot tensile deformation study and constitutive modeling of new high zinc containing hot rolled Al–Zn–Mg–Cu alloy

Akter

Rashed

2018

J. Phys. Commun.

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Hot tensile deformation behavior of a new kind of hot rolled high zinc containing Al-9.6%Zn-3.1% Mg-1.84%Cu alloy was investigated under different deformation temperatures (250°C-400°C) and strain rates (0.000 05-000 05 s −1 ) conditions. From the true stress-true strain diagrams, it is observed that peak stress decreases with increasing temperature and decreasing strain rate. Exponent type equations following Arrhenius model were used to predict peak stress at the experimental conditions and the values were compared with the experimental values. Zener-Hollomon parameter (Z) has been determined at various test conditions and activation energy has been found to be 146.2 kJ mol −1 which is slightly greater than the bulk self-diffusion energy of pure Al (142 kJ mol −1 ) and consistent with the previous findings. Microstructural analysis of the deformed samples shows that deformation mechanism transforms to dynamic recrystallization from dynamic recovery with the decrease of the Z value. Additional XRD, SEM, DSC and EDS analysis were performed to determine the type of the precipitates present in the sample before deformation and analyze their effect on the deformation mechanism.

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Effect of temperature and strain rate on hot deformation behavior and microstructure of Al-Cu-Li alloy

Cited by 67 publications

References 26 publications

Hot workability and microstructure evolution of Al–0.2Sc–0.04Zr alloy

Hot workability and microstructure evolution of Al–0.2Sc–0.04Zr alloy

Constitutive equations and processing map for hot deformation of a Ti-6Al-4V alloy prepared with spark-plasma sintering

Hot tensile deformation study and constitutive modeling of new high zinc containing hot rolled Al–Zn–Mg–Cu alloy

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