Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1635593 | Transactions of Nonferrous Metals Society of China | 2016 | 6 Pages |
Abstract
The discontinuous yielding phenomenon (DYP) during high temperature deformation was investigated based on the isothermal compression of TC8 titanium alloy. The DYP of TC8 titanium alloy was characterized by quantifying the yield drop of the DYP (ÎÏUL) and ending strain of flow oscillation (ÉOSC) based on the flow stress-strain curves, and then the effect of deformation parameters on the ÎÏUL and ÉOSC values was analyzed. The results show that the ÎÏUL and ÉOSC values increase with the increase of strain rate. The effect of deformation temperature on the ÎÏUL value depends on the strain rate. Finally, the transmission electron microscope (TEM) observation shows the evidence for the dynamic theory, which ascribes the DYP to the generation of mobile dislocation at the grain boundary. Meanwhile, the optical microscope (OM) observation shows that both the primary α grain and β grain become smaller with the increase of strain, which well interprets the effect of deformation parameters on the ÎÏUL and ÉOSC values.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Ke WANG, Miao-quan LI,