Characterization of semisolid deformation behavior and constitutive analysis of Ti230 alloy
| Autor: | Chuang Luo, Yongnan Chen, Xue-Dan Ma, Yong-Qing Zhao, Jian-feng Wei |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Mechanical Engineering General Chemical Engineering Metallurgy Alloy technology industry and agriculture Aerospace Engineering Titanium alloy Strain rate engineering.material Flow stress equipment and supplies Stress (mechanics) Solid mechanics engineering General Materials Science Deformation (engineering) Composite material Softening |
| Zdroj: | Mechanics of Time-Dependent Materials. 19:325-334 |
| ISSN: | 1573-2738 1385-2000 |
| DOI: | 10.1007/s11043-015-9266-8 |
| Popis: | The semisolid compressive deformation behavior of Ti230 titanium alloy at the temperature range of 1273 K to 1573 K and strain rate range of 0.005 to 5 s−1 has been investigated by hot compressive testing. The relationship between flow stress and deformation parameters and microstructure were discussed. The results show that the alloy expresses obvious yield point in semisolid state. The maximum decreased with decreasing solid phase fraction and/or decreasing strain rate, and a transition in stress occurred at a solid phase fraction close to 0.95, which is considered to be associated with the decrease in amount of solid bridges between grains and the decomposing effects of the liquid on α-Ti matrix. A deformation constitutive equation for Ti230 alloy in semisolid state was established considering high-temperature deformation activation energy Q. Furthermore, microstructural analysis confirmed that increasing temperature could reduce the deformation-resistant stress and lead to the transformation of softening mechanism from plastic deformation of solid particles (PDS) to sliding between the solid particles (SS). |
| Databáze: | OpenAIRE |
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