Mert Efe

E-mail
mefe@metu.edu.tr
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Excessive damage increase in dual phase steels under high strain rates and temperatures
Cobanoglu, Merve; Ertan, Rasim K.; Şimşir, Caner; Efe, Mert (SAGE Publications, 2020-09-01)
Damage formation in dual phase steels is a complex process and it may be sensitive to the deformation conditions and mechanisms. In this study, the damage parameter is measured and compared under quasi-static and industria...
Micro- and mesoscale mechanical properties of an ultra-fine grained CrFeMnNi high entropy alloy produced by large strain machining
Gigax, Jonathan G.; El-Atwani, Osman; McCulloch, Quinn; Aytuna, Berk; Efe, Mert; Fensin, Saryu; Maloy, Stuart A.; Li, Nan (Elsevier BV, 2020-03-01)
Large strain machining (LSM), an attractive severe deformation technique due to its simplicity, has been previously used to produce a fine-grained structure in a variety of alloys. An equiatomic CrFeMnNi high entropy alloy...
Investigation of Portevin-LeChatelier Bands in 5754 Aluminum Alloy under Various Strain Paths
Aytuna, O. Berk; Efe, Mert (Elsevier BV; 2019-01-01)
This work investigated the mechanical and microstructural effects of Portevin-LeChatelier bands in aluminum 5754 alloy under different loading conditions. For these conditions (equibiaxial and uniaxial), an in-plane biaxia...
Does sink efficiency unequivocally characterize how grain boundaries impact radiation damage ?
El-Atwani, O.; Martinez, E.; Esquivel, E.; Efe, Mert; Taylor, C.; Wang, Y. Q.; Uberuaga, B. P.; Matoy, S. A. (2018-11-21)
The role of grain boundaries in limiting irradiation damage in nanocrystalline materials is often correlated with the grain boundary sink efficiency. Here, we demonstrate on a tungsten material system (which has very disti...
Nanohardness measurements of heavy ion irradiated coarse- and nanocrystalline-grained tungsten at room and high temperature
El-Atwani, O.; Weaver, J. S.; Esquivel, E.; Efe, Mert; Chancey, M. R.; Wang, Y. Q.; Maloy, S. A.; Mara, N. (Elsevier BV, 2018-10-01)
Heavy ion irradiation was performed on coarse and nanocrystalline-grained tungsten (CGW and NGW, respectively) at room temperature (RT) and 1050 K from 0.25 to 4 dpa to simulate radiation damage for fusion energy applicati...
MULTI-SCALE CHARACTERIZATION OF DEFORMATION IN ALUMINUM
Güler, Baran; Efe, Mert (2018-06-22)
Materials with deformation behavior sensitive to their microstructure may need deformation analysis at multiple scales to establish the relationship between the microstructure and response to deformation processing. In thi...
Twinning-induced shear banding and its control in rolling of magnesium
Atik, Kubra; Efe, Mert (Elsevier BV, 2018-05-16)
Rolling of magnesium sheets is challenging at temperatures below 200 degrees C due to the strain localization and shear banding associated with the twinning activity. In this study, magnesium sheets with basal, off-basal (...
Loop and void damage during heavy ion irradiation on nanocrystalline and coarse grained tungsten: Microstructure, effect of dpa rate, temperature, and grain size
El-Atwani, O.; Esquivel, E.; Efe, Mert; Aydogan, E.; Wang, Y. Q.; Martinez, E.; Maloy, S. A. (Elsevier BV, 2018-05-01)
Displacement damage, through heavy ion irradiation was studied on two tungsten grades (coarse grained tungsten (CGW) and nanocrystalline and ultrafine grained tungsten (NCW)) using different displacement per atom rates and...
Detailed transmission electron microscopy study on the mechanism of dislocation loop rafting in tungsten
El-Atwani, O.; Aydogan, E.; Esquivel, E.; Efe, Mert; Wang, Y. Q.; Maloy, S. A. (Elsevier BV, 2018-04-01)
Dislocation loop rafting and dislocation decoration have been previously observed in neutron and heavy ion irradiated materials. Understanding the fundamental aspects of these phenomena assist in evaluating irradiation dam...
Softening due to Grain Boundary Cavity Formation and its Competition with Hardening in Helium Implanted Nanocrystalline Tungsten
Cunningham, W. Streit; Gentile, Jonathan M.; El-Atwani, Osman; Taylor, Chase N.; Maloy, Stuart A.; Trelewicz, Jason R.; Efe, Mert (Springer Science and Business Media LLC, 2018-2-13)
The unique ability of grain boundaries to act as effective sinks for radiation damage plays a significant role in nanocrystalline materials due to their large interfacial area per unit volume. Leveraging this mechanism in ...
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