Rights statement: This is the author’s version of a work that was accepted for publication in Materials Science & Engineering A. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Materials Science & Engineering A, 848, 2022 DOI: 10.1016/j.msea.2022.143402
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Microstructure, mechanical properties and biocompatibility of laser metal deposited Ti–23Nb coatings on a NiTi substrate
AU - Ren, Yaojia
AU - Du, Jingguang
AU - Liu, Bo
AU - Jiao, Z.B.
AU - Tian, Yingtao
AU - Baker, Ian
AU - Wu, Hong
N1 - This is the author’s version of a work that was accepted for publication in Materials Science & Engineering A. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Materials Science & Engineering A, 848, 2022 DOI: 10.1016/j.msea.2022.143402
PY - 2022/7/19
Y1 - 2022/7/19
N2 - To simultaneously obtain superior superelasticity and biological properties, single- and multi-layer Ti–23Nb coatings were deposited on a cold-rolled NiTi substrate using laser metal deposition (LMD). The microstructure of the single-layer coating consisted of a cellular structure with a grid size of ∼300 μm in the eutectic layer, strip structures and prior β-(Ti, Nb) phases surrounded by the Ti2Ni(Nb) phase in the Ni diffusion zone. In contrast, the microstructure of the multi-layer coating consisted of α′, α′′, and prior β phases, which arise from the partition of Nb. Compared with the NiTi substrate, the Ni ion release concentration of the single-layer coating is reduced by 45% with similar nano-mechanical behavior, i.e. a nanohardness, H, of ∼4.0 GPa, a reduced Young's modulus, E r, of ∼65 GPa, an elastic strain to failure, H/E r, of ∼0.06, a yield stress, H 3/E r 2, of ∼0.016 GPa, and a superelastic strain recovery, η sr, of ∼0.3. The reduction of Ni ion concentration for multi-layer coating after 35 days is even better at up to 62%, but at the cost of a degradation in the mechanical properties. The LMD coatings have a high dislocation density, and their creep is controlled by dislocation movement.
AB - To simultaneously obtain superior superelasticity and biological properties, single- and multi-layer Ti–23Nb coatings were deposited on a cold-rolled NiTi substrate using laser metal deposition (LMD). The microstructure of the single-layer coating consisted of a cellular structure with a grid size of ∼300 μm in the eutectic layer, strip structures and prior β-(Ti, Nb) phases surrounded by the Ti2Ni(Nb) phase in the Ni diffusion zone. In contrast, the microstructure of the multi-layer coating consisted of α′, α′′, and prior β phases, which arise from the partition of Nb. Compared with the NiTi substrate, the Ni ion release concentration of the single-layer coating is reduced by 45% with similar nano-mechanical behavior, i.e. a nanohardness, H, of ∼4.0 GPa, a reduced Young's modulus, E r, of ∼65 GPa, an elastic strain to failure, H/E r, of ∼0.06, a yield stress, H 3/E r 2, of ∼0.016 GPa, and a superelastic strain recovery, η sr, of ∼0.3. The reduction of Ni ion concentration for multi-layer coating after 35 days is even better at up to 62%, but at the cost of a degradation in the mechanical properties. The LMD coatings have a high dislocation density, and their creep is controlled by dislocation movement.
KW - Laser metal deposition
KW - Ti-Nb coating
KW - metastable phase
KW - creep
KW - Nickel ion release
U2 - 10.1016/j.msea.2022.143402
DO - 10.1016/j.msea.2022.143402
M3 - Journal article
VL - 848
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
SN - 0921-5093
M1 - 143402
ER -