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Five-element FeCoNiMoSi series high-entropy alloy and preparing method thereof

A technology of high-entropy alloys and alloys, applied in the field of FeCoNiMoSi high-entropy alloy materials and their preparation, can solve the problems of alloy plasticity reduction and achieve the effect of excellent plasticity

Active Publication Date: 2018-12-07
JIANGSU YONGHAO HIGH STRENGTH BOLT
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Problems solved by technology

[0004] Al 0.5 CoCrCuFeNiSi x (x=0, 0.4, 0.8) The increase of Si content in the high-entropy alloy promotes the transformation of FCC phase to BCC phase in the alloy system, and its hardness, compressive strength and wear resistance are also significantly improved, but at the same time the plasticity of the alloy decreases

Method used

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  • Five-element FeCoNiMoSi series high-entropy alloy and preparing method thereof
  • Five-element FeCoNiMoSi series high-entropy alloy and preparing method thereof
  • Five-element FeCoNiMoSi series high-entropy alloy and preparing method thereof

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Embodiment 1

[0021] The preparation process of embodiment 1 high entropy alloy is as follows:

[0022] 1) Raw material preparation: the mass percentage is converted according to the atomic percentage, and the high-purity metal raw material (≥99.95%) is accurately weighed and proportioned according to the mass percentage for use in smelting alloys. The alloy composition is shown in Table 1, according to x=1, 2, 3, 4, 5, represented by Si1, Si2, Si3, Si4 and Si5 respectively.

[0023] Table 1. (FeCoNi) 75 Mo 25-x Si x (x = 1, 2, 3, 4, 5) Nominal composition (at%) of the high-entropy alloy.

[0024]

[0025] 2) Melting of high-entropy alloys: In this embodiment, a WK type non-consumable vacuum electric arc furnace is used, and the weighed elemental raw materials are put into the water-cooled copper mold melting pool in the vacuum electric arc furnace, oxygen-absorbing titanium is placed in the middle of the crucible, and then Close the oven door and tighten the knob. Then vacuumize th...

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Abstract

The invention discloses a five-element FeCoNiMoSi series high-entropy alloy and a preparing method thereof. The problem that existing structural steel is poor in heat resistance property is solved. The high-entropy alloy is composed of five elements of Fe, Co, Ni, Mo and Si; the atomic percents of Fe, Co and Ni are 25%, the atomic percent of Mo and the atomic percent of Si are 20 to 24% and 1 to 5% correspondingly, the high-entropy alloy is mainly composed of a face-centered cubic phase, a topological close-packed phase Mu and a Leaves phase, and along with increasing of the Si content, the simple cube structural phase is formed. The obtained five-element FeCoNiMoSi series high-entropy alloy has the higher strength and plasticity, and the alloy can serve as a structural material to be applied to the heat resistance field.

Description

technical field [0001] The invention relates to the field of metal materials and their preparation, in particular to a novel FeCoNiMoSi high-entropy alloy material and a preparation method thereof. technical background [0002] In thermodynamics, the entropy value represents the degree of chaos of the system. The greater the entropy value, the greater the degree of chaos of the system. The system undergoes a spontaneous process. When the entropy reaches the maximum value, the system tends to be stable and reaches equilibrium. A high-entropy alloy is a new type of alloy formed by mixing five or more elements in an equimolar ratio or close to an equimolar ratio. In a broad sense, as long as the atomic percentage of each principal atom is in the range of 5% to 35%, it can be called a high-entropy alloy. In high-entropy alloys, no element content exceeds 50%, which means that this type of alloy is collectively led by a variety of elements to express its characteristics. [000...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C30/00
CPCC22C1/02C22C30/00
Inventor 刘宁彭振陈晨杜文栋王小京
Owner JIANGSU YONGHAO HIGH STRENGTH BOLT
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