Obtaining a High-Entropy Fe–Cr–Co–Ni–Ti Alloy by Mechanical Alloying and Electric Spark Plasma Sintering of a Powder Mixture
Russian journal of non-ferrous metals(2021)
摘要
A two-phase powder alloy based on substitutional solid solutions with bcc and fcc lattices has been obtained by the high-intensity mechanical treatment (HMT) of a multicomponent powder mixture Fe + Cr + Co + Ni + Ti. Sections of the samples and particles of the resulting mixtures are studied on an ultra-high resolution scanning electron microscope (SEM) by scanning electron microscopy. X-ray diffraction patterns of the mixtures are recorded on a DRON 3 diffractometer using Fe K α and Cu K α radiation. It is found that after 10 min of HMT one intense superposition reflex remains on the XRD pattern, the angular position of which corresponds to reflections of 111 and 110 phases with fcc and bcc lattices, respectively. Spark plasma sintering (SPS) at temperatures of 800 and 1000°C from the mixture after 90 min of HMT resulted in samples of a compact high-entropy material. Their specific electrical resistance and density, as well as the dependence of these characteristics (properties) on the sintering temperature, have been determined. It is shown that, in the process of SPS of the powder alloy, the enrichment of the substitutional solid solution with the bcc lattice with titanium probably occurs.
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关键词
Keywords: multicomponent alloy,Fe–Cr–Co–Ni–Ti,high-intensity mechanical treatment (HMT),face-centered crystal lattice (FCC),body-centered crystal (BCC) lattice,spark plasma sintering (SPS),compact high-entropy material
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