| Autor: |
Wen Jing Zhang, Wen Jing Yang, Hua Ding, Ji Zhong Li |
| Rok vydání: |
2018 |
| Předmět: |
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| Zdroj: |
Defect and Diffusion Forum. 385:189-194 |
| ISSN: |
1662-9507 |
| Popis: |
Ti-6Al-4V alloy sheet with two kinds of initial microstructure (base material (BM) and heat-treated material) was subjected to friction stir processing (FSP). These two kinds of friction stir processed (FSPed) materials show similar characteristics that the microstructure exhibited equiaxed ultrafine-grained (UFG) structure with high fraction of high angle grain boundaries (HAGBs) and random crystallographic orientations. Furthermore, slightly finer grains were observed in FSPed heat-treated material than that in FSPed BM. Superplastic tensile tests were conducted utilizing the FSPed heat-treated material in the strain rates range from 1×10-2 to 1×10-4 s-1 at 650°C, and the optimal superplasciticy with an elongation of 1220% was achieved at 1×10-3 s-1. The superplastic deformation mechanism appears to be grain boundary sliding. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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