High-performance NiCoCrFeMnTi system high-entropy alloy and preparation method thereof

Abstract

The invention provides a high-performance NiCoCrFeMnTi system high-entropy alloy and a preparation method thereof. The NiCoCrFeMnTi system high-entropy alloy comprises, in atomic percent, 5-50% of Ni,5-50% of Co, 5-50% of Cr, 5-50% of Fe, 5-50% of Mn and 5-50% of Ti, and the high-entropy alloy comprises FCC (face center cubic) solid solution, BCC (body center cubic) solid solution and HCP (close-packed hexagonal) structure precipitation phase particles. The NiCoCrFeMnTi system high-entropy alloy is reasonable in component, high in alloy degree, alloy strength and abrasion resistance and goodin high-temperature performance and meets mechanical property requirements of extreme environmental component materials for cutters, bearings, reactors, blast furnace linings, gas turbine hot forgingparts and the like. A preparation process of the alloy is simple and convenient to operate, low in production cost and suitable for industrial production and can prepare large-sized ingot blanks.

Description

technical field [0001] The invention belongs to the technical field of alloy materials and preparation thereof, in particular to a high-performance NiCoCrFeMnTi high-entropy alloy and a preparation method thereof. Background technique [0002] In the 1990s, the AlFeCrCoNiCu body-centered cubic solid solution alloy was developed by Professor J.W.Yee from Taiwan, China, which exhibited excellent mechanical properties. At the same time, Cantor et al. from the University of Oxford also developed a FeCrCoNiMn face-centered cubic solid solution alloy, which not only has excellent mechanical properties, but also has excellent plastic deformation ability. In 2006, Professor Yee defined this type of alloys with high entropy and containing multiple elements (the number of metal elements contained n≥5) as high-entropy alloys. Traditional alloys are dominated by one metal element, and their mixing entropy is generally less than 0.69R (R is a universal constant, about 8.31J / mol K). When...

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Problems solved by technology

At present, domestic research on high-performance high-entropy alloys has also made some progress. For example, an AlCrFeNiCuMo alloy disclosed in Chinese patent CN201410386446.2 has good hardness, high compressive strength and outstanding corrosion resistance. The alloy is approved by FCC Composed of BCC structure, it is prepared by pressing powder material and vacuum sintering. However, the preparation process of this method is complicated, and the powder metallurgy density is difficult to achieve the ideal effect. There are possibilities of segregation, void and looseness among the elements of powder metallurgy products. At the same time, the hardness of the material prepared by this method is as low as about 500HV.

Chinese patent CN200810063807.4 discloses a high-entropy alloy composite material, which is prepared by in-situ self-generation method or non-in-situ self-generation method. In the high-entropy alloy, a certain volume of reinforcing phase, such as TiC and TiB, is added through in-situ self-generation and externally. 2 , TiB, Ti 3 Al, AlN, etc.; the alloy material is specifically manufactured by arc melting, induction melting, self-propagating-melting casting or powder metallurgy, the preparation method is complicated, and the size of the added reinforcement phase is large, and the distribution of the reinforcement phase in the obtained product is not uniform. Therefore, the microhardness of the obtained material is about 700HV, and the high temperature performance is not reflected in this alloy material

The application document CN201610414014.7 discloses a FeSiBAlNiCo bulk high-entropy alloy. The crystal structure of the bulk high-entropy alloy includes FCC, BCC, and two-phase intermetallic compounds FeSi and FeB. The hardness of the alloy can reach more than 1100HV, but the bulk high-entropy alloy Prepared by powder metallurgy process, its density is about 96.5%, and the cavity inside the block seriously affects the tensile properties and fatigue properties of the material; at the same time, the block high-entropy alloy is prepared by powder making and spark plasma sintering technology, and the process is relatively complicated. During the spark plasma sintering process, the process parameters are difficult to control, the material elements B and Al have low melting points and are easy to burn out, and it is difficult to obtain an alloy material with uniform structure and stable and reliable performance

The application document CN201410034858.X discloses an inert anode for an aluminum electrolytic cell. The anode material is 5 kinds to 10 kinds of high-entropy alloys, the process mainly adopts vacuum induction melting, and the low-melting-point metal and high-melting-point metal are placed up and down in advance, so that the low-melting point metal melts first and is easy to evaporate and burn during the melting process, making it difficult to control the alloy composition , the composition of the ingot is uneven

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