Nanostructured β-type titanium alloy fabricated by ultrasonic nanocrystal surface modification

Mehdi Kheradmandfard, Seyed Farshid Kashani-Bozorg, Chang Lae Kim, Abbas Zarei Hanzaki, Young Shik Pyoun, Jung Hyong Kim, Auezhan Amanov, Dae Eun Kim

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50 Citations (Scopus)


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 ∼385 HV compared to 190 HV for the untreated alloy. It was further determined that highly dense deformation twins were generated at a depth of ∼40–150 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.

Original languageEnglish
Pages (from-to)698-706
Number of pages9
JournalUltrasonics Sonochemistry
Publication statusPublished - 2017 Nov

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Radiology Nuclear Medicine and imaging
  • Inorganic Chemistry
  • Acoustics and Ultrasonics
  • Environmental Chemistry
  • Organic Chemistry


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