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Effect of high pressure torsion process on the microhardness, microstructure and tribological property of Ti6Al4V alloy
- Source :
- Journal of Materials Science & Technology. 94:183-195
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- In the present study, a fully lamellar Ti6Al4V alloy was severely deformed by high pressure torsion (HPT) process under a pressure of 7.5 GPa up to 10 revolutions. Experimental results revealed that the microhardness of Ti6Al4V was increased remarkably by about ∼ 41% and saturated at about 432 Hv after the HPT process. A relatively uniform bulk nanostructured Ti6Al4V alloy with an average grain size of about 52.7 nm was obtained eventually, and no obvious formation of metastable ω phase was detected by XRD analysis. For the first time, the tribological properties of the HPT processed Ti6Al4V alloy were investigated by a ball-on-disc test at room temperature under a dry condition. It was found that HPT process had a great influence on the friction and wear behaviors of Ti6Al4V alloy. With increasing the number of HPT revolutions, both friction coefficient and specific wear rate were obviously decreased due to the reduction of abrasion and adhesion wears. After being deformed by 10 HPT revolutions, the friction coefficient was reduced from about 0.49 to 0.37, and the specific wear rate was reduced by about 48%. The observations in this study indicated that HPT processed Ti6Al4V alloys had good potential in structural applications owing to their greatly improved mechanical and tribological properties.
- Subjects :
- Materials science
Polymers and Plastics
Mechanical Engineering
Metals and Alloys
Titanium alloy
02 engineering and technology
Tribology
010402 general chemistry
021001 nanoscience & nanotechnology
Microstructure
01 natural sciences
Indentation hardness
Grain size
0104 chemical sciences
Abrasion (geology)
Mechanics of Materials
Materials Chemistry
Ceramics and Composites
Lamellar structure
Severe plastic deformation
Composite material
0210 nano-technology
Subjects
Details
- ISSN :
- 10050302
- Volume :
- 94
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Science & Technology
- Accession number :
- edsair.doi...........77bcfe31d1b3275ad6bcbf9488d43957