Bonding and Microstructural Stability in Ni55Ti45 Studied by Experimental and Theoretical Methods

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• 作者：Amanda C. Stott ; Jonathan I. Brauer ; Anita Garg ; Stephen V. Pepper ; Phillip B. Abel ; Christopher DellaCorte ; Ronald D. Noebe ; Glenn Glennon ; Eric Bylaska ; David A. Dixon
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：November 25, 2010
• 年：2010
• 卷：114
• 期：46
• 页码：19704-19713
• 全文大小：651K
• 年卷期：v.114,no.46(November 25, 2010)
• ISSN：1932-7455

文摘

Spiral orbit tribometry friction tests performed on Ni-rich Ni₅₅Ti₄₅ titanium ball bearings indicate that this alloy is a promising candidate for future aerospace bearing applications. Microstructural characterization of the bearing specimens was performed using transmission electron microscopy and energy dispersive spectroscopy, with NiTi, Ni₄Ti₃, Ni₃Ti, and Ni₂Ti₄O_x phases identified within the microstructure of the alloy. Density functional theory was applied to predict the electronic structure of the Ni_xTi_y phases, including the band structure and site projected density of states. Ultraviolet photoemission spectroscopy was used to verify the density of states results from the density functional theory calculations, with good agreement observed between experiment and theory.