Mechanics of Nanomaterials and Advanced Materials Laboratory

Our Laboratory

In the Nanomechanics Lab, we focus on the development and mechanical characterization of advanced materials. We investigate a wide range of engineering materials including nanostructured metals, metallic glasses, hard coatings, 3D printed components and refractory materials.

Nanolayered Metals

Nanolayered metals are promising materials for engineering applications due to their high strength, thermal stability and radiation resistance. Our research aims to understand the mechanical behavior of these materials and determine the relationship between their microstructure and mechanical properties.

Transmission electron microscopy image of nanolayered Cu-Nb [1].

Atomic force microscopy image of a nanoindent on a nanocrystalline Cu alloy [2].

Cross section image of an indent on a nanolayered metal that shows the deformation geometry [3].

Metallic Glasses

Metallic glasses possess outstanding strength and elastic limits. However, their brittle nature limits their use in applications. We seek to better understand the fracture behavior of metallic glasses and develop metallic glass matrix nanocomposites with improved ductility.

Images of a metallic glass micropillar before and after compression testing [4].

Wear Resistant Coatings

Nanostructured coatings can provide enhanced hardness, wear and scratch resistant combined with good resistance to fracture. We investigate the mechanical performance of new generation metal nitride coatings as well as promising model structures such as nanolayered metallic glass – crystalline composite coatings.

Nanoscratch measurements on nanolayered metallic glass – nanocrystalline metal composite coatings [5].

Surface morphology of a metallic glass coating upon scratch testing [5].

3D Printing

Understanding mechanical performance of printed parts is critical for the reliable usage of these components in engineering applications. We investigate the effect of materials and process variables on the mechanical properties of 3D-printed parts to optimize the microstructure for the best performance.

Electron microscopy image of the fracture surface of a 3D-printed specimen [6].

Radiation Effects on Materials

Structural components in nuclear power plants are subjected to high doses of particle irradiation. The resulting microstructural evolution can alter mechanical properties drastically. Through advanced characterization, we aim to understand the effect of radiation on the mechanical properties of candidate structural nanomaterials for the reliable design and operation of next-generation nuclear power plants.

A CuTiAg micropillar before (on the left) and after (on the right) compression under ion irradiation [7].

Finite Element Modeling of Nanomechanical Testing

We use finite element analyses to model nanomechanical measurements such as nanoindentation and micropillar compression. These studies provide us a better understanding of the mechanics of the measurements and allow us to better interpret our experimental measurements.

Stress field in a nanolayered metal specimen under nanoindentation, predicted by finite element analyses [8].

Fracture of Refractory Materials

Refractory metals are commonly utilized in extreme environments of high temperature, pressure, and corrosion. Our first work in this field focuses on understanding the fracture behavior of graphite upon severe thermal loads.

References

[1] S. Özerinç, N. Verma, R.S. Averback, Strengthening in multilayered Cu-Nb through alloying, MRS Fall Meeting & Exhibit, 2017, Boston, USA.

[2] S. Özerinç, K. Tai, N.Q. Vo, R.S. Averback, P. Bellon, S. Dillon, W.P. King, Grain boundary strengthening in dilute nanocrystalline Cu alloys, MRS Fall Meeting & Exhibit, 2011, Boston, USA.

[3] S. Özerinç, unpublished work.

[4] E. Kalay, S. Özerinç, in preparation for publication.

[5] Mohammad Abboud, Zafer Artvin, Amir Motallebzadeh, Sezer Özerinç, Multilayered Metallic Glass-Crystalline Nanocomposites with Improved Wear Resistance, TMS Annual Meeting & Exhibition, 2018, San Diego, USA.

[6] B. Kaygusuz, S. Özerinç, in preparation for publication.

[7] S. Özerinç, R.S. Averback, W.P. King, In situ creep measurements on micropillar samples during heavy ion irradiation, Journal of Nuclear Materials 451, 104-110 (2014).

[8] A.Ç. Pınar, S Özerinç, in preparation for publication.


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24/03/2018 - 17:26