Method for preparing high-entropy alloy containing immiscible element

A high-entropy alloy and immiscible technology, which is applied in the field of preparation of high-entropy alloys containing immiscible elements, can solve the problems of immiscibility, element insolubility, solid solubility limitation, etc., and achieve uniform structure, expansion properties and The effect of using range

Inactive Publication Date: 2009-03-18
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional solid solution preparation is based on the relevant rules of the equilibrium phase diagram, but in fact many elements cannot be solid-soluble, one aspect is the limitation of solid solubility, and the other is completely immiscible

Method used

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  • Method for preparing high-entropy alloy containing immiscible element

Examples

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Comparison scheme
Effect test

Embodiment 1

[0039] al 31 sn 26 Cu 17 Ni 10 Ti 10 Zn 6 High entropy alloy preparation:

[0040] 31% aluminum (Al) powder by weight (the element content percentages mentioned herein refer to weight percentages without special instructions), 26% tin powder (Sn), 17% copper powder (Cu), 10 % of nickel powder (Ni), 10% of titanium powder (Ti), 6% of zinc powder (Zn), the preparation of alloy powder, wherein aluminum and tin elements belong to the solid immiscible system. After 4 hours of hydrogen annealing in a reducing atmosphere furnace, put it into a corundum ball mill jar, vacuumize it, fill it with argon, and carry out mechanical alloying under an argon protective atmosphere. The speed of the planetary high-energy ball mill is 800rad / min, and the ball milling time is 15 hours. The collected ultra-fine high-entropy quasi-miscible alloy powder is taken out of the glove box, put into the pre-prepared mold, and pressed in both directions in the steel mold. The molding pressure is 350MP...

Embodiment 2

[0042] Pb 21 sn 20 Ag 17 Nb 16 Mg 14 mn 6 B 6 High entropy alloy preparation:

[0043] 41% lead (Pb) tin (Sn) quasi-alloy powder by weight percentage, 17% silver powder (Ag), 16% niobium powder (Nb), 14% magnesium powder (Mg), 6% manganese powder ( Mn), 6% boron powder (B), prepare alloy powder, wherein lead, tin and boron elements belong to solid immiscible system with each other. After hydrogen annealing in a reducing atmosphere furnace for 3 hours, put it into a ball mill jar made of corundum material, vacuumize it, fill it with argon gas, and carry out mechanical alloying under an argon protective atmosphere. The rotation speed of the planetary high-energy ball mill is 1000rad / min, and the ball milling time is 25 hours. The collected ultra-fine high-entropy quasi-miscible alloy powder is taken out of the glove box, put into the pre-prepared mold, and pressed in two directions in the steel mold. The molding pressure is 300MPa, and it is further pressed by cold isost...

Embodiment 3

[0045] Zr 21 W 16 Cr 14 Nb 13 Mo 13 Fe 10 f 7 Cu 6 High entropy alloy preparation:

[0046] By weight 21% zirconium (Zr) powder, 16% tungsten powder (W), 14% chromium powder (Cr), 13% niobium powder (Nb), 13% molybdenum powder (Mo), 10% Iron powder (Fe), 7% hafnium powder (Hf), 6% copper powder (Cu), prepare alloy powder, in which copper and chromium elements belong to the solid-state insoluble system. After hydrogen annealing in a reducing atmosphere furnace for 8 hours, put it into a corundum ball mill jar, vacuumize it, fill it with argon, and carry out mechanical alloying under an argon protective atmosphere. The planetary high-energy ball mill rotates at 1200 rad / min, and the ball milling time is 45 hours. The collected ultra-fine high-entropy quasi-miscible alloy powder is taken out of the glove box, placed in a pre-prepared mold, and bidirectionally pressed in the steel mold. The molding pressure is 350MPa, and it is further pressed by cold isostatic pressing e...

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Abstract

The invention discloses a preparation method for a novel high-entropy alloy structure material. A plurality kinds of alloy element powder which can not form a miscible system are used as raw materials, thereby solving the solid solution problem of the alloy elements without solid solution region during the high-entropy alloy preparation, that is, mixing the powders in a planetary high-energy ball milling machine and obtaining ultra-fine powder of an immiscible system simultaneously through strong mechanical alloying function. When the alloy powder is pressed into a pressing blank, the heating treatment process condition is controlled to allow the alloy elements to diffuse through a short path and form a uniform multi-principal element mixing body containing no intermetal compound in a blank body, and a single-phase solid solution is obtained. The novel alloy prepared by the method is widely used in engine parts made of a high-temperature and creep resistance material, skins and tails of large thrust weight ratio high-speed aircrafts, corrosion resistant and wear resistant parts, wear-resistant materials such as pipes, gears and bearings and other structural material fields.

Description

technical field [0001] The invention relates to the scientific field of alloy material preparation, in particular to a preparation method of a high-entropy alloy containing incompatible elements. Background technique [0002] The known research status of high-entropy alloys: At the end of the 20th century, the known traditional alloys were close to maturity and saturation, and it was difficult for traditional alloy concepts to create new alloy systems or create new alloys in old alloy systems. The concept of entropy alloys can lead to many alloy systems, resulting in many interesting properties. The so-called multi-component (nano) high-entropy alloy is an alloy of multiple elements, in which each main element has a high atomic percentage. Some people define that the number of main elements in a high-entropy alloy is greater than or equal to 5, but its atomic percentage does not exceed 35%. That is to say, HEAs do not contain more than 50% of the main elements like traditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C30/06C22C30/02C22C30/04
Inventor 冯晶肖冰陈敬超于杰周荣张利娟王景
Owner KUNMING UNIV OF SCI & TECH
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