An Enhanced Steady-State Constitutive Model for Semi-solid Forming of Al7075 Based on Cross Model

Meshkabadi, Ramin; Pouyafar, Vahid; Javdani, Akbar; Faraji, Ghader

doi:10.1007/s11661-017-4192-9

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…In the SSMF process, the deformation characteristics and mechanism of the semi-solid billets are vital for the prediction of the flow stress, based on the temperature, material structure, and strain rate, through which the optimisation of the process parameters can be achieved [ 10 , 11 ]. Therefore, a lot of research has been performed to study the deformation characteristics and mechanisms in recent decades of various aluminium alloys [ 11 , 12 , 13 , 14 , 15 , 16 ]. Xu et al [ 7 ] investigated the compression behaviour of the semi-solid AZ91D magnesium alloy.…”

Section: Introductionmentioning

confidence: 99%

Deformation Characteristics and Constitutive Equations for the Semi-Solid Isothermal Compression of Cold Radial Forged 6063 Aluminium Alloy

et al. 2021

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Al-Mg-Si based alloys are popular alloys used in the automotive industry. However, limited studies have been performed to investigate the microstructure, deformation characteristics, and deformation mechanism for the semi-solid 6063 alloys. In this study, the cold radial forging method and semi-solid isothermal treatment (SSIT) are proposed in the semi-solid isothermal compression (SSIC) process to fabricate high-quality semi-solid 6063 billets. The effects of deformation temperature, strain rate, and strain on the microstructure, deformation characteristics, and deformation mechanism of the SSIC of cold radial forged 6063 alloys were investigated experimentally. Constitutive equations were established based on the measured data in experiments to predict the flow stress. Results show that an average grain size in the range from 59.22 to 73.02 μm and an average shape factor in the range from 071 to 078 can be obtained in the microstructure after the cold radial forged 6063 alloys were treated with SSIT process. Four stages (i.e., sharp increase, decrease, steady state, and slow increase) were observed in the true stress- true strain curve. The correlation coefficient of the constitutive equation was obtained as 0.9796 while the average relative error was 5.01%. The deformation mechanism for SSIC of cold radial forged aluminum alloy 6063 mainly included four modes: The liquid phase flow, grain slide or grain rotation along with the liquid film, slide among solid grains, and the plastic deformation of solid grains.

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Section: Introductionmentioning

confidence: 99%

Deformation Characteristics and Constitutive Equations for the Semi-Solid Isothermal Compression of Cold Radial Forged 6063 Aluminium Alloy

et al. 2021

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“…[16][17][18][19] However, there are a few successful methods and publications on the examination of the transient rheological behavior under the rapid shear rate changes. For instance, although the semisolid back extrusion process has been used, [20] it has been concluded that the process is not suitable for characterizing the rheological properties of semisolid slurries with high solid contents due to the liquid segregation. [16] Furthermore, the rheological measurement of the rapid shear change is beyond the capacity of the conventional rotational rheometers.…”

Section: Introductionmentioning

confidence: 99%

Transient Rheological Behavior of Semisolid SEED-Processed 7075 Aluminum Alloys in Rapid Compression

Bolouri

Chen

2018

Metall Mater Trans B

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The transient rheological behavior and microstructure evolution of semisolid SEED-processed 7075 aluminum alloys were studied using the rapid compression tests. The effects of the TiB 2 grain refinement on the grain morphology and size of semisolid slurries were investigated. Results indicated that the grain refiner could reduce the grain size and improve the globularity of a-Al grains. The grain-refined alloy can be easily deformed at a wide range of solid contents (0.42 to 0.53 Fs), in which the deformation level appears to be independent from the solid content. Under the transient state, the apparent viscosity decreased with increasing shear rate to a minimum value and followed by an increase as the shear rate decreased. The apparent viscosity of the base alloy exhibited a dependency on the solid content, while the apparent viscosity of the grain-refined alloy in the decreasing or increasing shear rate periods was not substantially influenced by the solid content. The viscosity as a function of applied shear rate can be described using the power law viscosity model. The differences in the flow behavior index (n) and the consistency index (k) for two alloys were discussed.

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Forming and properties of 7075 aluminum alloy by rheological squeeze casting with transverse mobile injection feed

Pei

Shu-guo

Guo

et al. 2022

Int J Adv Manuf Technol

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An Enhanced Steady-State Constitutive Model for Semi-solid Forming of Al7075 Based on Cross Model

Cited by 7 publications

References 31 publications

Deformation Characteristics and Constitutive Equations for the Semi-Solid Isothermal Compression of Cold Radial Forged 6063 Aluminium Alloy

Deformation Characteristics and Constitutive Equations for the Semi-Solid Isothermal Compression of Cold Radial Forged 6063 Aluminium Alloy

Transient Rheological Behavior of Semisolid SEED-Processed 7075 Aluminum Alloys in Rapid Compression

Forming and properties of 7075 aluminum alloy by rheological squeeze casting with transverse mobile injection feed

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