Deformation behavior and characteristics of sintered porous 2024 aluminum alloy compressed in a semisolid state
| Autor: | Kaibin Yu, Yunzhong Liu, Teng Wang, Min Wu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Mechanical Engineering Alloy Metallurgy Constitutive equation chemistry.chemical_element 02 engineering and technology engineering.material Edge (geometry) 021001 nanoscience & nanotechnology Condensed Matter Physics Breakup 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Mechanics of Materials Aluminium engineering Relative density General Materials Science Deformation (engineering) Composite material 0210 nano-technology Porosity |
| Zdroj: | Materials Science and Engineering: A. 674:144-150 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2016.07.120 |
| Popis: | Semisolid powder forming technology is a novel technology that has achieved a great progress in recent years. However, the deformation behavior and constitutive model governing semisolid powder forming remain unclear. Sintered porous 2024 aluminum alloy specimens with different initial relative densities were compressed at 580–600 °C in a semisolid state at strain rates of 0.1, 1, and 5 s −1 . The results indicate that the solid skeleton of the sintered porous material deforms elastic-plastically in stage I ( e e c1 ) without breakup of the solid skeleton and powders. In stage II ( e c2 > e > e c1 ), the solid skeleton is broken up and the powders rupture. Then, the liquid is squeezed out, and it flows and fills the gaps/pores, resulting in higher relative density. In stage III ( e > e c2 ), powders are crushed into fragments and the liquid flows from the edge to the surface of the samples. Then, new pores appear, decreasing the density of the samples. The constitutive equation is modified by introducing variables of liquid fraction and relative density, and it agrees well with the measured data. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect