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Low-cost, high-strength and high-toughness mid-entropy alloy and preparation method

A high-strength, high-toughness, entropy alloy technology, applied in the field of low-cost, high-strength, high-toughness medium-entropy alloys and preparation, can solve the problems of incompatibility of strength and plasticity, high cost, etc., and achieve excellent thermal stability, high repeatability, Reasonable and simple preparation process

Active Publication Date: 2020-11-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a low-cost, high-strength, high-toughness medium-entropy alloy and its preparation method. Aiming at the problem that high-entropy and medium-entropy alloys cannot have both strength and plasticity, and the problem of high cost, the design Low-cost, high-strength and high-toughness medium-entropy alloy system, and strengthened by introducing nanoscale coherent precipitates through appropriate deformation-heat treatment methods

Method used

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  • Low-cost, high-strength and high-toughness mid-entropy alloy and preparation method
  • Low-cost, high-strength and high-toughness mid-entropy alloy and preparation method
  • Low-cost, high-strength and high-toughness mid-entropy alloy and preparation method

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Experimental program
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Effect test

Embodiment 1

[0041] A low-cost, high-strength, high-toughness medium-entropy alloy, the chemical formula of which is Ni 47 Fe 23.5 Cr 23.5 al 3 Ti 3 , Abbreviated as Al3Ti3 alloy, in which the ratio of each element is mole (atomic) percentage. Concrete preparation process is as follows:

[0042](1) Pretreatment and batching of raw materials: use mechanical grinding to remove the oxide scales on the surface of Ni, Fe, Cr, Al and Ti elements, and use acetone and alcohol solutions for ultrasonic cleaning in turn, and then dry them for later use. Weigh and batch according to the nominal composition of the alloy, and the total weight of raw materials is 2Kg.

[0043] (2) Melting: Place Ni, Fe, and Cr elements in a vacuum induction melting furnace and heat to 1650°C for 15 minutes, then add Al and Ti elements and hold for 10 minutes, then pour the melt into a steel mold to cool.

[0044] (3) Homogenization treatment: The ingot of the medium-entropy alloy is heat-treated at 1200° C. / 10 h, f...

Embodiment 2

[0050] A low-cost, high-strength, high-toughness medium-entropy alloy, the chemical formula of which is Ni 46 Fe 23 Cr 23 al 4 Ti 4 , Simplified Al4Ti4 alloy, in which the ratio of each element is mole (atomic) percentage. The preparation process is as follows:

[0051] (1) Pretreatment and batching of raw materials: use mechanical grinding to remove the oxide scales on the surface of Ni, Fe, Cr, Al and Ti elements, and use acetone and alcohol to perform ultrasonic cleaning in sequence, and then dry them for later use. Weigh according to the nominal composition of the alloy, and the total weight of raw materials is 2Kg.

[0052] (2) Melting: Place Ni, Fe, and Cr elements in a vacuum induction melting furnace and heat to 1650°C for 15 minutes, then add Al and Ti elements and hold for 10 minutes, then pour the melt into a steel mold to cool.

[0053] (3) Homogenization treatment: The ingot of the medium-entropy alloy is heat-treated at 1200° C. / 10 h, followed by water quen...

Embodiment 3

[0059] A low-cost, high-strength, high-toughness medium-entropy alloy, the chemical formula of which is Ni 46 Fe 23 Cr 23 al 4 Ti 4 , Abbreviated as Al4Ti4 alloy, in which the ratio of each element is mole percent. The preparation process is as follows:

[0060] (1) Pretreatment and batching of raw materials: use mechanical grinding to remove the oxide scales on the surface of Ni, Fe, Cr, Al and Ti elements, and use acetone and alcohol solutions for ultrasonic cleaning in turn, and then dry them for later use. Weigh according to the nominal composition of the alloy, and the total weight of raw materials is 500g.

[0061] (2) Melting: Place Ni, Fe, and Cr elements in a vacuum induction melting furnace and heat to 1650°C for 15 minutes, then add Al and Ti elements and hold for 10 minutes, then pour the melt into a steel mold to cool.

[0062] (3) Homogenization treatment: The ingot of the medium-entropy alloy is heat-treated at 1200° C. / 10 h, followed by water quenching. ...

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Abstract

The invention relates to a low-cost, high-strength and high-toughness mid-entropy alloy and a preparation method. The composition of the alloy is (Ni2FeCr)100-x-yAlxTiy, the molar ratio of Ni to Fe toCr is 2:1:1, and the atomic percentages of the elements Al and Ti meet 2<=x<=4at.% and 2<=y<=4at.% respectively. The preparation process of the alloy includes the steps: weighing and mixing the constituent elements according to the nominal composition, and performing vacuum melting and appropriate deformation-heat treatment processes to obtain the alloy. The alloy material has the structural feature that a nano-scale gamma' phase is dispersively distributed in an FCC matrix. The mid-entropy alloy has the performance characteristics of low cost, high strength, high plasticity, excellent thermal stability and the like.

Description

technical field [0001] The invention belongs to the technical field of metal materials and their preparation, and relates to a low-cost, high-strength, high-toughness medium-entropy alloy and a preparation method. Background technique [0002] Multi-principal alloys break through the design concept of traditional alloys and provide an effective way to design high-performance metal materials. Multi-principal alloys can be classified into high-entropy alloys (ΔS mix ≥1.5R) and medium entropy alloys (1R<ΔS mix <1.5R). The high-entropy and medium-entropy alloys are mixed with multiple components and the structural characteristics of atomic arrangement chemical disorder make them show unique properties different from traditional metals, such as high compositional entropy, large lattice distortion, and slow atomic diffusion. It exhibits a series of excellent mechanical and physical properties and has broad application prospects. [0003] Face-centered cubic (FCC) high-en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/00
CPCC22C30/00C22C1/02C22F1/002
Inventor 罗贤陆文杰杨延清
Owner NORTHWESTERN POLYTECHNICAL UNIV
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