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- 저자 : Mandana Adeli (검색결과 2 건)
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Arman Khobzi,Mandana Adeli,Ashkan Sabour‑Bagherzadeh,Ashkan Arab,Hooman Abedi 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
NiTi intermetallic compound was fabricated via two modes of the combustion synthesis process, namely, thermal explosion(TE) and self-propagating synthesis (SHS). The effect of combustion synthesis mode as well as Ni particle size on themicrostructure and microhardness of the final products was investigated. The phases in the products were determined usingXRD technique, and microstructural investigations were performed using optical as well as SEM-EDS in order to make acomparison between microstructural evolutions in each mode, other conditions being constant. The analyses showed thatthe desired B2(NiTi) was successfully formed as the primary phase in all samples, and no unreacted Ni or Ti powders werepresent. The main secondary phase was NiTi2which was invariably present in all samples; however, the percentage as wellas the morphology of the detrimental NiTi2phase was found out to be controllable by the mode of combustion as well asNi particle size. A comparison between the two modes revealed that samples produced by TE showed coarse dendritesin the microstructure; they also presented higher average microhardness values. The SHS-synthesized samples exhibitedmicrostructures similar to those observed in heat-treated and homogenized NiTi obtained from methods such as vacuum arcremelting and vacuum induction melting, and contained finely dispersed NiTi2particles. It was shown that a decrease in Niparticle size presented a grain refining effect on NiTi2in both modes.
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Arman Ahmadi‑Binahri,Mandana Adeli,M. Reza Aboutalebi,Sergey Krasikov 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.6
In this study, the application of thermite reactions in Nb2O5–Al system in the fabrication of novel NbAl3/Al2O3 compositeswas investigated. Combining the thermite reactions with self-propagating high-temperature synthesis (SHS) techniquein compressed powder mixtures of Nb2O5+ Al resulted in layer-by-layer progress of the exothermic reaction, controlledformation of the desired products and their coexistence in each reacted layer. Characterization of the products using X-raydiffraction (XRD), scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDS) techniques showedthat all samples were composed of a metallic matrix including NbAl3as the main compound, along with Al2O3as ceramicreinforcing phase. Differential thermal analysis (DTA) analysis was used to study the mechanism of reaction using bothstoichiometric and over-stoichiometric amounts of aluminum. The effect of such parameters as stoichiometry and greendensity of the samples on the combustion temperature, formed phases, microstructure, and hardness of the obtained compositeswas investigated using samples with stoichiometric as well 20 wt% and 40 wt% excess aluminum, and samples withgreen densities of 75%, 85%, and 95% of theoretical maximum density (TMD). The presence of excess aluminum resultedin prolonged reaction times, lower combustion temperatures, and lower mean values of hardness. While the variations ingreen density had no remarkable effect on the microstructural features of products within the density range under study, themost intensive reactions, highest combustion temperature, and highest mean value of hardness were encountered in sampleswith green density of 85%TMD.
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