An Enhanced Steady-State Constitutive Model for Semi-solid Forming of Al7075 Based on Cross Model
| Autor: | Akbar Javdani, Ramin Meshkabadi, Vahid Pouyafar, Ghader Faraji |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Structural material
Materials science Constitutive equation Alloy Metallurgy Metals and Alloys 02 engineering and technology Mechanics engineering.material Cross model 021001 nanoscience & nanotechnology Condensed Matter Physics 020501 mining & metallurgy Physics::Fluid Dynamics Shear rate 0205 materials engineering Shear (geology) Mechanics of Materials Forensic engineering engineering Extrusion 0210 nano-technology Semi solid |
| Zdroj: | Metallurgical and Materials Transactions A. 48:4275-4285 |
| ISSN: | 1543-1940 1073-5623 |
| DOI: | 10.1007/s11661-017-4192-9 |
| Popis: | The parameters of the Cross model were determined in a wide range of shear rates close to industrial conditions using rapid compression tests and backward extrusion experiments. The Cross model fitted well with experimental results at low shear rates, but it almost broke down at high shear rates. In this paper, a new steady-state model was proposed for semi-solid forming of Al7075 considering the effects of the yield stress, entrapped liquid, and shear rate using the Cross model. The yield stress of the alloy was estimated in the semi-solid state by extrapolating the viscosity at the least applicable shear rates. The results showed that the new model eliminated the Cross model’s deviations, and it can be used for accurate prediction of the steady-state flow behavior of the semi-solid alloy in a wide range of shear rates. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink