Mechanical behavior of metallic glass / HCP nanolayered coatings

Date

2019-09-01

Author

Özerinç, Sezer
Motallebzadeh, Amir

Metadata

Show full item record

Item Usage Stats

192
views

0
downloads

Introduction/Purpose High hardness, large elastic limits and grain-boundary free structure of metallic glasses (MG) make them promising materials for wear resistant, corrosion resistant and biocompatible coatings [1]. However, the brittle nature of MGs in monolithic form is a major disadvantage. MG/crystalline nanolayered composites can overcome this problem by impeding the catastrophic propagation of shear bands [2]. Most studies so far on these nanocomposites have focused on MG/FCC crystalline structures [3] and little is known about nanolayers with different crystal structures. In this work, we investigate metallic glass/HCP nanolayers, to gain insight into the effect of crystal structure on their mechanical behavior. Methods 1 um-thick nanolayered MG/HCP coatings of CuZr/Zr and CuTi/Ti were deposited on silicon substrates with layer thicknesses in the range 10–100 nm. XRD, TEM, nanoindentation, and nanoscratch measurements characterized the samples. Wear tracks were further analyzed by FIB cross- sectioning and AFM scans. Results Hardness values of nanolayered CuZr/Zr and CuTi/Ti are very close to their MG counterparts; CuZr, and CuTi, respectively; and are independent of layer thickness. This behavior is quite different than MG/FCC layers, where hardness increases with decreasing layer thickness due to the strengthening effects in the crystalline phase [3]. The results can be interpreted by the confined layer slip model [4], which suggests that the size- independent strength of the softer MG layers mediate the initiation of plastic behavior in the nanolayers. When it comes to scratch measurements, CuZr/Zr nanolayers exhibit decreasing scratch resistance with decreasing layer thickness, which can be attributed to the low shear strength of the amorphous/crystalline interface. The nanolayered coatings are highly damage tolerant, and can maintain their integrity at compressive strains exceeding 80%. Conclusions MG/HCP nanolayers exhibit a unique behavior of size-independent strength combined with good fracture resistance under sliding loads, making them a promising model system for the design of new protective coatings.

URI

https://hdl.handle.net/11511/86902
https://drive.google.com/file/d/1wcxLmmu_jtbxwOHWiP6XyC3X_88ImCYx/view

Conference Name

EUROMAT 2019

Collections

Department of Mechanical Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Surfactant-modified multiscale composites for improved tensile fatigue and impact damage sensing Yesil, Sertan; Winkelrnann, Charles; Bayram, Göknur; La Saponara, Valeria (Elsevier BV, 2010-10-25) This paper documents the mechanical and electrical performance of self-sensing conductive polymer composites prepared with a low-cost technique and small hardware, able to considerably improve the dispersion and the surface adhesion of multi-walled carbon nanotubes (CNTs) in epoxy resin with respect to amine-modified CNTs and as-received CNTs. Surface treatment of the CNTs is performed using hexamethylene diamine, or a mix of sulfuric and nitric acid, and one of two surfactants (for the diamine treatment on...
Nanolayered metallic glass-crystalline composites with high strength and wear resistance Özerinç, Sezer (null; 2020-02-23) Nanolayered metallic glass-crystalline composites are promising materials that combine the high strength of metallic glasses with the superior ductility of crystalline metals. Previous work has focused on metallic glass-FCC crystalline nanolayers, and showed that the strength follows the Hall-Petch behavior of increasing strength with decreasing layer thickness. In our work, we investigated metallic glass-HCP crystalline nanolayers. Interestingly, the strength of these layers does not show any size effect; ...
Nanomaterial-Enhanced All-Solid Flexible Zinc-Carbon Batteries Hiralal, Pritesh; Imaizumi, Shinji; Ünalan, Hüsnü Emrah; Matsumoto, Hidetoshi; Minagawa, Mie; Rouvala, Markku; Tanioka, Akihiko; Amaratunga, Gehan A. J. (2010-05-01) Solid-state and flexible zinc carbon (or Leclanche) batteries are fabricated using a combination of functional nanostructured materials for optimum performance. Flexible carbon nanofiber mats obtained by electrospinning are used as a current collector and cathode support for the batteries. The cathode layer consists of manganese oxide particles combined with single-walled carbon nanotubes for improved conductivity. A polyethylene oxide layer containing titanium oxide nanoparticles forms the electrolyte laye...
Wear behavior of H10A AISI/SAE steel nitrided by various methods Yurtışık, Koray; Sarıoğlu, Filiz; Ankara, Alpay; Department of Metallurgical and Materials Engineering (2002) Wear performance of salt-bath, vacuum, ion nitrided and duplex treated (nitrided and ceramic coated by physical vapor deposition technique) steel dies (H10A AISI/SAE) were studied. The dies were used for forging of steel pastes (52100 AISI/SAE) at 1050°C under 700 MPa for 0.3 - 0.4 seconds during production of bearing rings. The nitrided and un-nitrided dies were investigated via optical and scanning electron microscopy, x-ray diffraction and micro-hardness determination procedures. The service lives of die...
MECHANICAL PROPERTIES OF REPAIRED CARBON FIBER REINFORCED POLYMER COMPOSITES Sonat, Emine Evren; Özerinç, Sezer; Department of Mechanical Engineering (2021-12-10) Carbon fiber reinforced polymer (CFRP) composites are increasingly used in the aerospace industry due to their high specific strength compared to conventional metallic materials. However, a significant shortcoming of these composites is their increased susceptibility to damage. Structural repair is a common method to restore the load-carrying capacity of a damaged part when the damage size exceeds the pre-defined tolerances. Scarf and stepped bonded repair methods are the primary choice for cases that requi...

Citation Formats

S. Özerinç and A. Motallebzadeh, “Mechanical behavior of metallic glass / HCP nanolayered coatings,” Stockholm, Sweden, 2019, p. 152, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/86902.