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An endogenous nano-ceramic reinforced high-entropy alloy composite material and its preparation method

A high-entropy alloy and composite material technology, which is applied in the field of high-entropy alloy composite materials and its preparation, can solve the problems of reducing strength and improving plasticity.

Active Publication Date: 2017-11-03
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acquisition of the plasticity of the above-mentioned high-entropy alloy materials either greatly reduces the strength or is not obvious in improving the plasticity.

Method used

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  • An endogenous nano-ceramic reinforced high-entropy alloy composite material and its preparation method
  • An endogenous nano-ceramic reinforced high-entropy alloy composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of composite powder: according to the above table, mechanically alloy the prepared powder in a high-energy ball mill. The dry milling speed is 450r / min, the dry milling time is 45h, the wet milling time is 5h, and the wet milling speed is 200r / min , to prepare high-entropy alloy composite powders. Specific steps are as follows:

[0022] a) Put the powder waiting for ball milling into a stainless steel grinding tank, use stainless steel balls as the grinding body, and ball mill according to the ball powder mass ratio of 10:1. Before ball milling, use a vacuum machine to evacuate for 10 minutes, and then fill it with 0.5MPa argon as a protective gas; the speed of the ball mill is 450r / min, and the rotation direction needs to be adjusted once every 60 minutes, and samples are taken after ball milling for 5h, 15h, 30h, and 45h .

[0023] b) Add absolute ethanol to the powder milled for 45 hours for 5 hours of wet milling. After the ball milling is finishe...

Embodiment 2

[0027] Weigh the alloy powder and carbon powder according to the table above, adopt the same method in Example 1 to prepare high-entropy alloy composite materials, and the alloy composition is Al 0.4 FeCrCoCuNiTi 0.3 / 5vol%TiC, the room temperature compressive fracture strength and plastic strain of the composite reached 2220MPa and 22.8%, respectively.

Embodiment 3

[0029] Weigh the alloy powder and carbon powder according to the above table, adopt the same method in Example 1 to prepare high-entropy alloy composite materials, and the alloy composition is FeCrCoCuNiTi 0.7 / 10vol%TiC, the room temperature compressive fracture strength and plastic strain of the composite reached 2310MPa and 20.4%, respectively.

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Abstract

The invention discloses an endogenous nano ceramic reinforcement high-entropy alloy composite material and a preparing method. High-entropy alloy particles serve as a base body phase, and meanwhile, in the high-energy ball milling process, mechanical alloying energy promotes the in-situ reaction to generate nano ceramic TiC, and an endogenous nano ceramic phase is segregated on the solid solution grain boundary, and ceramic phase reinforcement is generated; meanwhile, a flexible face-centered cubic solid solution is extruded to form a deformation twin, and therefore strength and plasticity combination of the high-entropy alloy composite material is achieved; and the high-strength high-toughness high-entropy alloy composite material is prepared, the excellent strength and the excellent strength are kept, and meanwhile, the plasticity of the composite material is improved.

Description

technical field [0001] The invention belongs to the technical field of metal-based composite materials, and in particular relates to a high-entropy alloy composite material and a preparation method thereof. Background technique [0002] Bulk high-entropy alloys (HEA) have a series of excellent mechanical properties different from traditional crystalline alloys, such as high strength, high hardness, low elastic modulus, and large elastic strain limit, making them considered as very potential structural materials. . However, the high brittleness makes the HEA material undergo catastrophic fracture in the form of sudden failure without obvious macroscopic plastic deformation at room temperature; the high brittleness and high hardness bring great difficulties to the processing of the material. All of these seriously restrict the large-scale application of HEA as an advanced structural material in engineering. Therefore, the problems of room temperature brittleness and processi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C30/02C22C32/00C22C1/05B22F9/04B22F3/105
CPCB22F3/105B22F9/04B22F2009/043C22C1/05C22C9/06C22C14/00C22C19/07C22C30/00C22C30/02C22C32/0052
Inventor 杨少锋张炎刘明严星杨堃
Owner NANJING INST OF TECH
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