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- 저자 : Maryam Mohri (검색결과 2 건)
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Maryam Mohri,Mohammed Renda Chellali,Di Wang,Julia Ivanisenko 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7
High entropy alloy thin films have been gained attention recently due to their exceptional properties like high corrosion resistance,unique mechanical and physical properties. In this research, DC magnetron sputtering was used to fabricate two kindsof high entropy alloys thin films of Ti–Zr–Pd–Cu and Ti–Zr–Pd–Cu–Bi at two working pressure 2 and 5 mTorr. Structural,thermal, and mechanical properties of the Ti–Zr–Pd–Cu and Ti–Zr–Pd–Cu–Bi thin films deposited at room temperature usingDC magnetron sputtering have been considered in this research. The microstructural analyses using X-ray diffractometer,scanning, and transmission electron microscopies show that the size of glassy clusters and the chemical composition of thinfilms can be controlled by adjusting the sputtering pressure. The high entropy alloy thin films deposited at high pressuredisplayed nano-clusters with an amorphous structure. The elemental distribution obtained using atom probe tomographyillustrated that Bi atoms were segregated along with the columnar interfaces. Furthermore, Bi addition to the Ti–Zr–Pd–Cuthin film led to increase in thermal stability and decrease in the characteristic enthalpy of the nanoglass thin films. The thinfilms’ mechanical properties were evaluated by nano-indentation. The results indicated that the Ti–Zr–Pd–Cu–Bi nanoglassthin film had higher strength, hardness, and elastic modulus than the Ti–Zr–Cu–Pd thin film. It was suggested that latticedistortion and nano columnar structure caused to increase in the mechanical properties of Ti–Zr–Pd–Cu–Bi thin film.
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Functionally-Graded Shape Memory Alloy by Diffusion Annealing of Palladium-Coated NiTi Plates
Fatemeh Khaleghi,Mohammad Tajally,Esmaeil Emadoddin,Maryam Mohri 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.5
Diffusion annealing of palladium-coated Ti-Ni plates was performed at temperatures ranging from 900 °C to1,000 °C, to accomplish a compositional gradient in Ti-rich, Ti-Ni shape memory alloys. The aim of this study wasto increase the transformation temperatures and transformation temperature intervals. Palladium diffusion profileswere measured by energy dispersive spectroscopy, and the corresponding approximate diffusion coefficients ofthe annealed specimens were calculated. The Gaussian solution of Fick’s second law for the one-dimensional latticediffusion of a tracer was used. The transformation behavior studies were performed by differential scanningcalorimetry. It was depicted that annealed specimens show longer transformation intervals compared to the barealloy. In addition, annealed specimens showed improved shape memory properties that were attributed to thelower amount of Ti2Ni precipitates in the diffusion layer. The shape memory behaviour of the samples wasdetected using micro-indentation at room temperature, followed by heating them above the austenite formationtemperature to calculate the shape recovery ratio.
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