Yazar "Çakır, Aslı" için listeleme
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3d transition-metal high-entropy Invar alloy developed by adjusting the valence-electron concentration
Rao, Ziyuan; Çakır, Aslı; Özgün, Özge; Ponge, Dirk; Raabe, D.; Li, Zhiming; Acet, Mehmet (American Physical Society, 2021)By considering the valence-electron concentration of 3d transition-metal alloys and compounds, we develop 3d high-entropy alloy Mn12.1Fe34.2Co33.5Ni12.3Cu7.9 with 8.7 electrons per atom, which is identical to that of ... -
Ab initio Prediction of Martensitic and Intermartensitic Phase Boundaries in Ni-Mn-Ga
Dutta, B.; Çakır, Aslı; Giacobbe, C.; Al-Zubi, A.; Hickel, T.; Acet, M.; Neugebauer, J. (Amer Physical Soc, 2016)Despite the importance of martensitic transformations of Ni-Mn-Ga Heusler alloys for their magneto-caloric and shape-memory properties, the martensitic part of their phase diagrams is not well determined. Using an ab initio ... -
Annealing-time and annealing-temperature dependencies of the size of Ni-Mn-In shell-ferromagnetic nano-precipitates by Scherrer analysis
Dincklage, L.; Scheibel, F.; Çakır, Aslı; Farle, M.; Acet, M. (Amer Inst Physics, 2018)Shell-ferromagnetic effects are observed in Ni-Mn-based off-stoichiometric Heuslers decomposed into ferromagnetic precipitates embedded in an antiferromagnetic matrix when the surface-to-volume ratio of the precipitates ... -
Characteristics of 5M modulated martensite in Ni-Mn-Ga magnetic shape memory alloys
Çakır, Aslı; Acet, M.; Righi, L.; Albertini, F.; Farle, M. (Amer Inst Physics, 2015)The applicability of the magnetic shape memory effect in Ni-Mn-based martensitic Heusler alloys is closely related to the nature of the crystallographically modulated martensite phase in these materials. We study the ... -
Decomposition in Ni-Co-Mn-In functional Hensler alloys and its effect on shell-ferromagnetic and magnetocaloric effects
Şaşmaz, Merivan; Dreist, F.; Iglesias, I.; Çakır, Aslı; Farle, Michael; Acet, Mehmet (Amer Physical Soc, 2020)Ni-Co-Mn-In Heusler-based compounds are interesting for their magnetocaloric properties and have been widely investigated for this purpose. For Co compositions more than 5 at% in (Ni100-xCox)(50)Mn25+yIn25-y the material ... -
Effect of Al doping on the magnetic and elastic properties of Fe65Ni35 Invar alloys
Çakır, Aslı (Scientific Technical Research Council Turkey-Tubitak, 2019)Invar alloys have great importance due to their low thermal expansion coefficient. The effect of Al doping on Fe65Ni35 Invar alloy was investigated by temperature-dependent magnetization and elastic modulus measurements. ... -
Emergence of net magnetization by magnetic field biased diffusion in antiferromagnetic L10 NiMn
Çakır, Aslı; Josten, Nicolas; Noorzayee, Sakia; Miroshkina, Olga; Zingsem, Benjami (AMER PHYSICAL SOC, 2023)NiMn is a collinear antiferromagnet with high magnetocrystalline anisotropy (K = -9.7 x 105 J m-3). Through magnetic annealing of NiMn with excess Ni, strongly pinned magnetic moments emerge due to an imbalance in the ... -
Evidence for the formation of nanoprecipitates with magnetically disordered regions in bulk Ni50Mn45In5 Heusler alloys
Benacchio, Giordano; Titov, Ivan; Malyeyev, Artem; Peral, Inma; Bersweiler, Mathias; Bender, Philipp; Michels, Andreas; Çakır, Aslı (Amer Physical Soc, 2019)Shell ferromagnetism is a new functional property of certain Heusler alloys which was recently observed in Ni50Mn45In5. We report the results of a comparative study of the magnetic microstructure of bulk Ni50Mn45In5 Heusler ... -
Exchange bias caused by field-induced spin reconfiguration in Ni-Mn-Sn
Çakır, Aslı; Acet, M.; Farle, M. (Amer Physical Soc, 2016)Exchange bias is observed in ferromagnetic/antiferromagnetic (FM/AF) layered stacks and in materials with neighboring ferromagnetic and antiferromagnetic granules. The latter is commonly observed in Ni-Mn-based martensitic ... -
Extended investigation of intermartensitic transitions in Ni-Mn-Ga magnetic shape memory alloys: A detailed phase diagram determination
Çakır, Aslı; Righi, Lara; Albertini, Franca; Acet, Mehmet; Farle, Michael; Aktürk, Selçuk (Amer Inst Physics, 2013)Martensitic transitions in shape memory Ni-Mn-Ga Heusler alloys take place between a high temperature austenite and a low temperature martensite phase. However, intermartensitic transformations have also been encountered ... -
Formation of precipitates in off-stoichiometric Ni-Mn-Sn Heusler alloys probed through the induced Sn-moment
Eggert, Benedikt; Çakır, Aslı; Günzing, Damian; Josten, Nicolas; Scheibel, Franziska; Acet, Mehmet (Royal Society of Chemistry, 2023)The shell-ferromagnetic effect originates from the segregation process in off-stoichiometric Ni-Mn-based Heusler alloys. In this work, we investigate the precipitation process of L21-ordered Ni2MnSn and L10-ordered NiMn ... -
Investigation of temperature dependent magnetization and elastic modulus in Si-doped Fe65Ni35 invar alloys
Özöğüt, Uğur Can; Çakır, Aslı (Elsevier Science Sa, 2017)Fe-65 Ni-35 invar is a prominent nickel steel alloy exhibiting low coefficient of thermal expansion around room temperature. The present work deals with the temperature dependence of the elastic modulus and magnetization ... -
Large magnetocaloric effects in magnetic intermetallics: First-principles and Monte Carlo studies
Entel, Peter; Gruner, Markus E.; Ogura, Masako; Sokolovskiy, Vladimir V.; Buchelnikov, Vasiliy D.; Gruenebohm, Anna; Çakır, Aslı (E D P Sciences, 2015)We have performed ab initio electronic structure calculations and Monte Carlo simulations of frustrated ferroic materials where complex magnetic configurations and chemical disorder lead to rich phase diagrams. With lowering ... -
Magnetic and structural instabilities in mictomagnetic Cu50Mn45Al5 against the formation of ferromagnetic precipitates
Çakır, Aslı (Pergamon-Elsevier Science Ltd, 2020)A new property of Heusler alloys known as shell-ferromagnetism is observed predominantly in NiMn-based Heusler alloys with X as Ga, Al, In and Sn. An antiferromagnetic-matrix/shell-ferromagnetic precipitate dual-phase ... -
Magnetic properties of fcc and ? phases in equiatomic and off-equiatomic high-entropy Cantor alloys
Özgün, Özge; Koch, David; Çakır, Aslı (AMER PHYSICAL SOC, 2023)The equiatomic face-centered-cubic (fcc) high-entropy alloy CrMnFeCoNi has a valence electron concentra-tion of 8 electrons per atom, equivalent to that of Fe. Its ground-state properties are similar to that of fcc-Fe and ... -
Magnetic properties of the FCC and BCC phases of (MnFeCoNi)(80)Cu(20_x)Z(x()Z(1)& nbsp;Al, Ga) high-entropy alloys
Orbay, Yaşar; Rao, Ziyuan; Çakır, Aslı; Tavşanoğlu, Tolga; Farle, Michael; Acet, Mehmet (PERGAMON-ELSEVIER SCIENCE LTD, 2023)In this work, the FCC-BCC phase transition in (MnFeCoNi)80Cu20 (Al, Ga) high entropy alloys were investigated on the basis of structural, magnetic, hardness and thermal expansion properties. It is found that the equiatomic ... -
Magnetic proximity effect and shell-ferromagnetism in metastable Ni50Mn45Ga5
Krenke, Thorsten; Çakır, Aslı; Scheibel, Franziska; Acet, Mehmet; Farle, Michael (Amer Inst Physics, 2016)The present study on magnetic and structural properties of Ni(50)Mn(45)G(a)5 confirms that structural metastability is an inherent property of Ni50Mn50-xXx Heusler alloys with X as In, Ga, and Sn. The ternary alloy transforms ... -
Neutron diffraction and symmetry analysis of the martensitic transformation in Co-doped Ni2MnGa
Orlandi, Fabio; Çakır, Aslı; Manuel, Pascal; Khalyavin, Dmitry D.; Acet, Mehmet; Righi, Lara (Amer Physical Soc, 2020)Martensitic transformations are strain driven displacive transitions governing the mechanical and physical properties in intermetallic materials. This is the case in Ni2MnGa, where the martensite transition is at the heart ... -
Non-volatile high-temperature shell-magnetic pinning of Ni-Mn-Sn Heusler precipitates obtained by decomposition under magnetic field
Çakır, Aslı; Acet, M. (Elsevier Science Bv, 2018)The thermodynamic instability of the off-stoichiometric Ni49.8Mn45.1Sn5.1 martensitic Heusler causes it to decompose into ferromagnetic Ni50Mn25Sn25 precipitates and an antiferromagnetic NiMn matrix. If the decomposition ... -
Room-temperature five-tesla coercivity of a rare-earth-free shell-ferromagnet
Scheibel, F.; Spoddig, D.; Meckenstock, R.; Gottschall, T.; Çakır, Aslı; Krenke, T.; Acet, M. (American Institute of Physics Inc., 2017)Ni2MnX-based Heusler (X: main group element), when enriched with Mn, will decompose into ferromagnetic Ni2MnX and antiferromagnetic NiMn when temper-annealed around 650 K. When the starting material is chosen such that the ...
