Study on the characteristics and thermal stability of nanostructures in adiabatic shear band of 2195 Al-Li alloy.
- Resource Type
- Article
- Authors
- Yang, Yang; Chen, Yadong; Jiang, Lihong; Li, Meng; Zhang, Qingming; Tang, Tiegang
- Source
- Applied Physics A: Materials Science & Processing. Nov2015, Vol. 121 Issue 3, p1277-1284. 8p. 1 Color Photograph, 4 Black and White Photographs, 2 Diagrams, 4 Graphs.
- Subject
- *ALUMINUM-lithium alloys
*THERMAL stability
*NANOSTRUCTURES
*ADIABATIC processes
*SHEARING force
*MICROHARDNESS
- Language
- ISSN
- 0947-8396
Adiabatic shear bands (ASB) were obtained by dynamic shearing with a split Hopkinson pressure bar in the hat-shaped specimens of 2195-T6 Al-Li alloy. TEM observations reveal that grains in ASB are mainly equiaxed with the grain size from 50 to 100 nm. The kinetics possibility of instant refinement of grains can well be explained with the rotation dynamic recrystallization mechanism. EBSD is used to investigate microstructure evolution in ASB after annealed at 100-400 °C for 1 h. Results show that grain size increases rapidly at higher annealing temperature, and grains grow from 0.22 μm at 300 °C to 1.77 μm at 400 °C. Microhardness measurement indicated that the microhardness value rises slowly with temperature increases and then drops quickly at 300 °C. The study indicates that the nanostructure in ASB is thermally stable below 300 °C. [ABSTRACT FROM AUTHOR]