Hot deformation behavior and microstructure evolution of 1460 Al–Li alloy

Xiang, Sheng; Liu, Danyang; Zhu, Rongfeng; Li, Jinfeng; Chen, Yong-lai; Zhang, Xu-hu

doi:10.1016/s1003-6326(15)64033-x

Cited by 27 publications

(7 citation statements)

References 29 publications

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“…Generally, the relationship between true stress and processing parameters of the studied alloy are highly nonlinear. Moreover, similar deformation characteristics of the other alloys are also observed by many researchers [19][20][21]. …”

Section: Flow Behaviorsupporting

confidence: 62%

Modeling the Constitutive Relationship of Al–0.62Mg–0.73Si Alloy Based on Artificial Neural Network

Han

Yan

Sun

et al. 2017

Metals

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Abstract:In this work, the hot deformation behavior of 6A02 aluminum alloy was investigated by isothermal compression tests conducted in the temperature range of 683-783 K and strain-rate range of 0.001-1 s −1 . According to the obtained true stress-true strain curves, the constitutive relationship of the alloy was revealed by establishing the Arrhenius-type constitutive model and back-propagation (BP) neural network model. It is found that the flow characteristic of 6A02 aluminum alloy is closely related to deformation temperature and strain rate, and the true stress decreases with increasing temperatures and decreasing strain rates. The hot deformation activation energy is calculated to be 168.916 kJ mol −1 . The BP neural network model with one hidden layer and 20 neurons in the hidden layer is developed. The accuracy in prediction of the Arrhenius-type constitutive model and BP neural network model is eveluated by using statistics analysis method. It is demonstrated that the BP neural network model has better performance in predicting the flow stress.

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Section: Flow Behaviorsupporting

confidence: 62%

Modeling the Constitutive Relationship of Al–0.62Mg–0.73Si Alloy Based on Artificial Neural Network

Han

Yan

Sun

et al. 2017

Metals

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“…× 100 (10) where N is the total number of the calculated stress values over the entire experimental temperatures and strain rates, E i is the measured flow stress values, P i is the calculated flow stress values, ̅ and ̅ are the average values of E i and P i , respectively. Figure 4d shows the correlation between the experimental and predicated flow stress values.…”

Section: Verification Of the Constitutive Modelmentioning

confidence: 99%

“…The value of n is 6.90 and the constant α can be attained as α=β/n 1 =0.0254 MPa -1 . The hot deformation activation Q, which indicates the difficulty degree of deformation in test material [10], can be calculated by taking partial differential of equation (3), as shown in equation (6).…”

Section: Deformation Constitutive Equationsmentioning

confidence: 99%

Hot Deformation Behaviors of Cu/Al Laminated Composites

Liu

Wang

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In order to research the hot deformation behaviors of Cu/Al laminated composites, isothermal hot compression tests were conducted on a Gleeble-1500D thermo-mechanical simulator in the temperature range of 300 ~ 450°C and strain rate range of 0.01 ~ 1 s -1 . After hot compression, the cooperative deformation behaviors between Cu and Al were discussed. The effects of deformation temperature and strain rate on the deformation behaviors were described using an Arrhenius-type constitutive equation. Furthermore, considering the effect of strain, the constitutive model was modified. The predicated flow stress values obtained from the modified constitutive equation could be well in accord with the experimental values. High correlation coefficient and low average absolute relative error demonstrate the high accuracy of the constitutive model developed in this work.

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“…The hot deformation activation Q, which indicates the deformation difficulty degree of test material and is the critical energy value of starting the dislocation movement [37,38], can be calculated by taking partial differential of Eq. (7), as shown in Eq.…”

Section: Ln ̇= Ln[sinh( )] + Ln − (7)mentioning

confidence: 99%

Hot Deformation Behaviour of Cu/Al Laminated Composites under Interface Constraint Effect

Liu¹,

Wang²,

Liang³

et al. 2018

Preprint

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Abstract:In order to understand the hot deformation behavior of novel Cu/Al laminated composites, isothermal hot compression tests were conducted by Gleeble-1500D thermo-mechanical simulator. And the effect of bonding interface, deformation temperature and strain rate on the deformation behavior was analyzed. Results show that under the interface constraint effect, soft Al layer trends to flow synchronously with hard Cu layer. And further microstructure examinations indicate the cooperative deformation capability of Cu/Al composites increases with increasing stain rate and decreasing deformation temperature. Strain hardening exponent, calculated based on the true stress-true strain data, also proves the effect of deformation temperature and strain rate on the cooperative deformation behavior. Meanwhile, unique composites structure allows the Al matrix to exhibit the characteristic of dynamic recrystallization during the hot deformation process. Lastly, strain compensated Arrhenius-type constitutive equation was employed to describe the coupling effect of temperature, strain rate and strain on the flow stress. Key words: Cu/Al laminated composites; deformation behavior; interface; microstructure; constitutive equation IntroductionWith the rapid development of modern industry, light-weight is an intense pursuit goal for more economical and green development at the basis of keeping original mechanical properties. Copper/aluminum (Cu/Al) laminated composites have been developed to meet these demands and several fabricate methods also have been presented in recent years [1][2][3][4][5]. Practices indicate that compared to monometallic copper or copper alloy, Cu/Al composites can reduce the weight of 40 ~ 50 %, save the cost of 30 ~ 50 % and keep almost consistent electrical and thermal conductivity [6]. Therefore, Cu/Al laminated composites have been utilized in a number of areas such as power, communication, architecture and aerospace [5,7]. Until now, numerous studies about Cu/Al composites are mainly focused on the fabricate technologies [1][2][3][4][5], thermal treatment crafts [8][9][10] and bonding mechanisms [11,12]. However, thermal mechanical machining such as hot rolling and tension also are necessary for Cu/Al composites in order to meet various industrial needs, to the authors' knowledge, related research is not available.For the hot deformation behavior of metal materials, the essence is dynamic competition between work hardening and dynamic softening (including dynamic recrystallization and dynamic recovery), and the process is significantly affected by deformation temperature, strain rate, microstructure and so on [13]. Until now, Arrhenius-type constitutive equation is a kind of commonly used mathematical model to describe the relationship between the flow stress and deformation temperature, strain rate and deformation activation energy during the hot deformation process [14]. And the hot deformation behaviors of constituent metals of Cu/Al laminated composites have been investigated respectively thro...

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Hot deformation behavior and microstructure evolution of 1460 Al–Li alloy

Cited by 27 publications

References 29 publications

Modeling the Constitutive Relationship of Al–0.62Mg–0.73Si Alloy Based on Artificial Neural Network

Modeling the Constitutive Relationship of Al–0.62Mg–0.73Si Alloy Based on Artificial Neural Network

Hot Deformation Behaviors of Cu/Al Laminated Composites

Hot Deformation Behaviour of Cu/Al Laminated Composites under Interface Constraint Effect

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