Effects of fine particle peening on oxidation behavior of nickeltitanium shape memory alloy

Shoichi Kikuchi, Yutaka Kameyama, Masayoshi Mizutani, Jun Komotori

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The effects of fine particle peening (FPP) on oxidation behavior of nickeltitanium shape memory alloy (NiTi alloy) were evaluated. After FPP treatment, oxidation process was performed at 300, 400 and 500°C for 30 min in N220 vol%O2 atmosphere. Surface microstructures of oxidized specimens pre-treated with FPP were characterized using scanning electron microscope (SEM), glow discharge optical emission spectroscopy (GD-OES), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction analysis (XRD). Oxide layers formed on the specimens pre-treated with FPP were thinner than those on the un-peened ones. Amorphous titanium oxides (TiO and TiO2) were formed on the un-peened specimens by oxidation process, whereas a nickel oxide (NiO) was created on the FPP-treated surface oxidized at temperature greater than 400°C as well as titanium oxides. This was because an amorphous structure created by FPP accelerated the outward growth of nickel oxide during the subsequent oxidation process. Moreover, the effects of surface oxide layers on the biocompatibility of NiTi alloy were investigated. Due to the formation of a thin oxide layer which contains nickel element, the oxidized specimen pre-treated with FPP showed higher amount of nickel ion elution than that of the oxidized one during the cell culture tests. These results suggest that microstructural feature of surface oxide layer strongly affects the biocompatibility of NiTi alloy.

Original languageEnglish
Pages (from-to)176-181
Number of pages6
JournalMaterials Transactions
Volume55
Issue number1
DOIs
Publication statusPublished - 2014

Fingerprint

peening
Shot peening
shape memory alloys
Shape memory effect
Oxidation
oxidation
Oxides
Nickel oxide
oxides
nickel oxides
Titanium oxides
biocompatibility
Nickel
Biocompatibility
titanium oxides
nickel
Optical emission spectroscopy
elution
Glow discharges
optical emission spectroscopy

Keywords

  • Amorphous
  • Biomaterial
  • Nickeltitanium shape memory alloy
  • Oxidation
  • Shot peening

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Effects of fine particle peening on oxidation behavior of nickeltitanium shape memory alloy. / Kikuchi, Shoichi; Kameyama, Yutaka; Mizutani, Masayoshi; Komotori, Jun.

In: Materials Transactions, Vol. 55, No. 1, 2014, p. 176-181.

Research output: Contribution to journalArticle

Kikuchi, Shoichi ; Kameyama, Yutaka ; Mizutani, Masayoshi ; Komotori, Jun. / Effects of fine particle peening on oxidation behavior of nickeltitanium shape memory alloy. In: Materials Transactions. 2014 ; Vol. 55, No. 1. pp. 176-181.
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