Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5467982 | Vacuum | 2017 | 23 Pages |
Abstract
In this work, by means of X ray diffraction, polarizing microscope, transmission electron microscope and mechanical properties test, the microstructure and mechanical properties of metastable β-type Ti-35Nb-2Ta-3Zr alloy were systematically studied by two different processing techniques. The results showed that there was a large amount of lath martensite in this alloy solution-treated by 1053 K for 30 min, and recrystallization occurred, but the grain growed again and became coarse equiaxed crystal. However, the alloy annealed by 923 K for 10 min undergone recrystallization inside the grains, and many fine grains appeared. In addition, a large number of dislocations and grain boundaries that provided adequate heterogeneous nucleation conditions for β phase during annealing to promote the transformation αⳠphase into β phase, so as to reduce the content of αⳠphase and stabilize β phase. Therefore, the annealed specimens had lower elastic modulus (55 GPa) and higher super-elasticity (47.94%) than the solution treated specimens.
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
Juan Chen, Fengcang Ma, Ping Liu, Xinkuan Liu, Wei Li, Xiaohong Chen, Ke Zhang, Lai-Chang Zhang,