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

doi:10.1016/j.ultsonch.2017.03.061

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

Ultrason Sonochem. 2017 Nov:39:698-706. doi: 10.1016/j.ultsonch.2017.03.061. Epub 2017 May 22.

Authors

Mehdi Kheradmandfard¹, Seyed Farshid Kashani-Bozorg², Chang-Lae Kim³, Abbas Zarei Hanzaki², Young-Shik Pyoun⁴, Jung-Hyong Kim⁴, Auezhan Amanov⁵, Dae-Eun Kim⁶

Affiliations

¹ School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran; Center for Nano-Wear, Yonsei University, Seoul 03722, South Korea.
² School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.
³ Center for Nano-Wear, Yonsei University, Seoul 03722, South Korea.
⁴ Department of Mechanical Engineering, Sun Moon University, Asan 31460, South Korea.
⁵ Department of Mechanical Engineering, Sun Moon University, Asan 31460, South Korea. Electronic address: aamanov@outlook.com.
⁶ Center for Nano-Wear, Yonsei University, Seoul 03722, South Korea; Department of Mechanical Engineering, Yonsei University, Seoul 03722, South Korea. Electronic address: kimde@yonsei.ac.kr.

PMID: 28732996
DOI: 10.1016/j.ultsonch.2017.03.061

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 60-200nm. In addition, there were lamellar grains consisting of nanostructured subgrains having unclear and wavy boundaries. The treated surface exhibited a hardness value of ∼385HV compared to 190HV for the untreated alloy. It was further determined that highly dense deformation twins were generated at a depth of ∼40-150µm 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: Gradient nanostructure; Nanoscale lamellae; Ultrasonic nanocrystal surface modification; Ultrasonic vibration; β-Ti alloy.

MeSH terms

Nanoparticles / chemistry*
Surface Properties
Titanium / chemistry*
Ultrasonic Waves*

Substances

beta titanium
Titanium