碳對(duì)不同晶體結(jié)構(gòu)高熵合金組織和性能的影響
[Abstract]:High entropy alloy is a new alloy composed of five or more elements in the form of equal molar ratio or near equal molar ratio. The properties of high entropy alloys are superior to those of traditional alloys due to their multi-principal component properties. Because of the interaction between elements, the change of element content and type has a great influence on the microstructure and properties of the alloy. By studying the effect of elements on the microstructure and properties of the alloy, a high-entropy alloy with excellent properties is obtained, which has a good theoretical guidance and reference significance for future scientific research. In this paper, AlFeCoNiCx, (Fe40Mn40Co10Cr10) 100-xCx and (Fe40Mn40Co10Ni10) 100-xCx, (Fe50Mn30Co10Cr10) 100-xCx series of high entropy alloys with different crystal structures have been prepared by traditional vacuum arc melting technique. The methods of analysis and measurement are (XRD), optical microscope, (OM), scanning electron microscope, (SEM) and (EDS). The effects of alloying elemental carbon on the microstructure and mechanical properties of high entropy alloys with different crystal structures were studied. The main results are as follows: (1) when the carbon element is added to the AlFeCoNi multicomponent alloy, the alloy changes from a single body-centered cubic (BCC) phase to a BCC face-centered (FCC) two-phase. When carbon content increased to a certain extent, flake graphite precipitated in FCC phase. The strength and plasticity of the alloy increase with the increase of carbon content. The compressive strength of the alloy increases from 1291MPa to 2875 MPa, and the plasticity increases from 5% to 2775 MPA. (2) the addition of carbon element does not change the crystal structure of Fe40Mn40Co10Cr10 and Fe40Mn40Co10Ni10 alloys, but increases the lattice constant of the alloy. In the (Fe40Mn40Co10Cr10) 100-xCx alloy, the strength of the alloy increases with the increase of carbon content, and the plasticity decreases, and a small amount of Cr7C3 compounds are produced when the carbon content is increased to a certain extent. In (Fe40Mn40Co10Ni10) 100-xCx system, carbon can significantly improve the strength and plasticity of the alloy. (3) Fe50Mn30Co10Cr10 high entropy alloy is a FCC dense hexagonal (HCP) two-phase high-entropy alloy. The addition of carbon promoted the transformation of HCP phase into FCC phase, and the volume fraction of HCP phase decreased with the increase of carbon content. With the addition of carbon element, the diffraction peak of the alloy shifts to the right and the lattice constant decreases. The hardness of the alloy decreases with the increase of carbon content, but the compressive strength increases with the increase of carbon content.
【學(xué)位授予單位】:西安工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TG139
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