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Refractory high-entropy alloy and forming method thereof

A high-entropy alloy and forming method technology, applied in the field of refractory high-entropy alloy and its forming, can solve the problems of refractory alloy element segregation, unreachable quality, poor anisotropy, etc., and achieve fine and uniform grain size, The effect of high density and refined grain size

Pending Publication Date: 2020-06-12
苏州天峰动立合金科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method uses conventional arc melting technology to prepare cast master alloy ingots with dual-phase FCC dendrite structure, which requires repeated melting, which consumes time and energy, and the master alloy ingots prepared by conventional arc melting technology are prone to poor anisotropy , the semi-solid billet obtained by water quenching and rapid cooling during casting and reheated after quantitative division is easy to cause segregation of refractory alloy elements, resulting in the final product still not reaching the ideal quality

Method used

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  • Refractory high-entropy alloy and forming method thereof
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  • Refractory high-entropy alloy and forming method thereof

Examples

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Embodiment 1

[0030] Embodiment 1: AlCoCrFeNi refractory high-entropy alloy and its forming method.

[0031] Weigh 54g of Al, 118g of Co, 104g of Cr, 112g of Fe and 118g of Ni according to the equal atomic percentage, and use differential thermal and thermogravimetric analysis (TD+TGA) and differential scanning calorimetry (DSC) to measure The solidus temperature T1 and liquidus temperature T2 of the AlCoCrFeNi refractory high-entropy alloy during the heating and melting process, the measured solidus temperature T1 is 800°C, and the liquidus temperature T2 is 1678°C.

[0032] In a vacuum of 10 -3 Under the vacuum environment of Pa, use the electromagnetic induction suspension melting process, under the electromagnetic stirring, melt the above-mentioned raw materials of the AlCoCrFeNi refractory high-entropy alloy, and fully mix the components in the liquid metal, and keep it at 1730℃±5℃ for 20min , cast into a mold, and cool to room temperature at 500° C. / min to obtain a cast billet.

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Embodiment 2

[0036] Example 2: TiZrNbMoV refractory high-entropy alloy and its forming method

[0037] According to equal atomic percentage, weigh 96g of Ti, 182g of Zr, 186g of Nb, 192g of Mo and 102g of Ni, and use differential thermal and thermogravimetric analysis (TD+TGA) and differential scanning calorimetry (DSC) to measure The solidus temperature T1 and liquidus temperature T2 of the TiZrNbMoV refractory high-entropy alloy during the heating and melting process, the measured solidus temperature T1 is 1730°C, and the liquidus temperature T2 is 2295°C.

[0038] In a vacuum of 10 -3 Under the vacuum environment of Pa, using the electromagnetic induction suspension melting process, under the electromagnetic stirring, the above-mentioned raw materials of the TiZrNbMoV refractory high-entropy alloy are melted, and the components in the liquid metal are fully mixed, and kept at 2490 ° C ± 5 ° C for 40 minutes , cast into a mold, and cool to room temperature at 200° C. / min to obtain a cas...

Embodiment 3

[0042] Example 3: TiZrNbMoV refractory high-entropy alloy and its forming method

[0043] According to the equal atomic atomic percentage, weigh 96g of Ti, 182g of Zr, 186g of Nb, 192g of Mo and 102g of Ni, first form Ti-Zr-Mo and Nb-V master alloys respectively, and use differential thermal and thermogravimetric analysis (TD+TGA) and differential scanning calorimetry (DSC) to measure the solidus temperature T1 and liquidus temperature T2 of the TiZrNbMoV refractory high-entropy alloy during the heating and melting process. The measured solidus temperature T1 is 1750 ° C, The liquidus temperature T2 was 2420°C.

[0044] In a vacuum of 10 -4 Under the vacuum environment of Pa, using the electromagnetic induction suspension melting process, under the electromagnetic stirring, the above-mentioned intermediate alloy raw materials of the TiZrNbMoV refractory high-entropy alloy are melted, and the components in the liquid metal are fully mixed, at 2525 ° C ± 5 ° C Keep warm for 10...

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Abstract

The invention relates to a refractory high-entropy alloy and a forming method thereof. The forming method comprises the steps of preparation of a refractory high-entropy alloy raw material, electromagnetic induction suspension smelting, high-frequency electromagnetic stirring of semi-solid slurry and die-casting forming. According to the method, suspension smelting, electromagnetic stirring and semi-solid forming are combined, the problem of serious component segregation commonly existing in high-entropy alloy is avoided, and a product with a fine and uniform microstructure and high density can be obtained.

Description

technical field [0001] The invention belongs to the technical field of advanced preparation and forming of metal materials, and in particular relates to a refractory high-entropy alloy and a forming method thereof. Background technique [0002] High-entropy alloys were originally defined as alloys formed by the alloying of more than five metals with equiatomic or near-equalatomic ratios and have a high mixing entropy. Later, this definition was broadened to allow mixing of unequal atomic ratios and may contain some trace amounts of elements to tune the properties of high-entropy alloys. High-entropy alloys have four major characteristics, namely high-entropy effect in thermodynamics, slow diffusion effect in kinetics, lattice distortion effect in structure and "cocktail" effect in performance. Due to the relatively large number of constituent elements of high-entropy alloys, the atomic radii of various elements are different, so a certain degree of lattice distortion occurs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/03C22C30/00B22D17/00B22D1/00
CPCC22C1/02C22C1/03C22C30/00B22D17/007B22D1/00C22C1/12
Inventor 韩坤解国良孙中刚董亮
Owner 苏州天峰动立合金科技有限公司
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