Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5144596 | Ultrasonics Sonochemistry | 2017 | 33 Pages |
Abstract
The surface of β-type Ti-Nb-Ta-Zr (TNTZ) alloy, which is a promising material for biomedical applications, was treated with the ultrasonic nanocrystal surface modification (UNSM) technique to enhance its hardness. As a result, a gradient nanostructured (GNS) layer was generated in the surface; the microstructure of the top surface layer consisted of nanoscale lamellae with a width of about 60-200 nm. In addition, there were lamellar grains consisting of nanostructured subgrains having unclear and wavy boundaries. The treated surface exhibited a hardness value of â¼385 HV compared to 190 HV for the untreated alloy. It was further determined that highly dense deformation twins were generated at a depth of â¼40-150 µm below the UNSM-treated surface. These deformation twins led to a significant work hardening effect which aided in enhancing the mechanical properties. It was also found that UNSM treatment resulted in the formation of micropatterns on the surface, which would be beneficial for high bioactivity and bone regeneration performance of TNTZ implants.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Chemistry (General)
Authors
Mehdi Kheradmandfard, Seyed Farshid Kashani-Bozorg, Chang-Lae Kim, Abbas Zarei Hanzaki, Young-Shik Pyoun, Jung-Hyong Kim, Auezhan Amanov, Dae-Eun Kim,