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Strengthening and toughening regulation and control method for refractory high-entropy alloy

A high-entropy alloy, strengthening and toughening technology, which is applied in the field of strengthening and toughening of refractory high-entropy alloys, can solve the problems of ignoring alloy characteristics and few reports on alloying element control, and achieve comprehensive mechanical properties and excellent high-temperature microstructure. Effects of structural stability, high strength and plasticity

Pending Publication Date: 2022-03-04
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the publicly reported materials, alloying new components, doping non-metallic elements, and developing new preparation processes are the main methods for optimizing the performance of WTaMoNb alloys. A series of refractory high-entropy alloys with relatively excellent properties have been developed successively. However, the alloy properties of WTaMoNb itself have been ignored, and the element regulation of the alloy itself has rarely been reported.

Method used

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  • Strengthening and toughening regulation and control method for refractory high-entropy alloy
  • Strengthening and toughening regulation and control method for refractory high-entropy alloy
  • Strengthening and toughening regulation and control method for refractory high-entropy alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Take W, Ta, Mo, Nb elemental pure metal particles with a purity of not less than 99.95wt.%, mechanically polish to remove scale, and after ultrasonic cleaning and drying, according to the atomic ratio of 25at.%W-25at.%Ta- 25at.% Mo-25at.% Nb for precise batching. The weighed 4 kinds of pure metal raw materials are successively distributed in the water-cooled copper mold crucible of the non-consumable vacuum arc melting furnace according to the order of the melting point of the elements from low to high. Vacuum the chamber to 4×10 before melting -3 Pa, filled with argon to 0.7 atmospheres. When smelting, first smelt the titanium ingot in the furnace for 3 minutes to remove the residual oxygen in the furnace cavity; when smelting the target alloy, keep it for 150s after the alloy is completely melted, then cool, turn the alloy ingot and melt again, a total of 6 melting times to ensure that the alloy composition is uniform .

[0028] (2) A block sample of 5 mm × 4 m...

Embodiment 2

[0034] On the basis of Example 1, different from Example 1: in step (2), the element content is optimized to W 10 Ta 10 Mo 40 Nb 40 . In step (3), W, Ta, Mo, Nb elemental pure metal particles with a purity of not less than 99.95wt.% are taken, mechanically polished to remove scale, and after ultrasonic cleaning and drying, the atomic ratio is 10at.%W-10at. %Ta-40at.%Mo-40at.%Nb for precise batching. In step (4), utilize wire cutting to cut from the middle part of the alloy ingot Use 2000-grit sandpaper to gently grind off the wire-cut marks on the bottom surface of the cylindrical sample and the scale on the side. After ultrasonic cleaning and drying, use the Instron5982 electronic universal testing machine to test the mechanical properties of the alloy at room temperature.

[0035] image 3 W prepared for Example 2 10 Ta 10 Mo 40 Nb 40 Room temperature stress-strain curves of refractory high-entropy alloys. It can be seen that W 10 Ta 10 Mo 40 Nb 40 The yield ...

Embodiment 3

[0037] On the basis of Example 1, different from Example 1: in step (2), the element content is optimized to W 5 Ta 5 Mo 45 Nb 45 . In step (3), W, Ta, Mo, Nb elemental pure metal particles with a purity of not less than 99.95wt.% are taken, mechanically polished to remove scale, ultrasonically cleaned and dried, and the atomic ratio is 5at.%W-5at. %Ta-45at.%Mo-45at.%Nb for precise batching. In step (4), utilize wire cutting to cut from the middle part of the alloy ingot Use 2000-grit sandpaper to gently grind off the wire-cut marks on the bottom surface of the cylindrical sample and the scale on the side. After ultrasonic cleaning and drying, use the Instron5982 electronic universal testing machine to test the mechanical properties of the alloy at room temperature.

[0038] The W prepared in embodiment 3 5 Ta 5 Mo 45 Nb 45 The scanning electron microscope photos of refractory high-entropy alloys are attached Figure 4 shown. It can be seen that the optimized W 5 ...

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Abstract

The invention discloses a strengthening and toughening regulation and control method for a refractory high-entropy alloy. The method comprises the following steps: (1) preparing a refractory high-entropy alloy cast ingot; (2) observing the alloy structure morphology of the ingot casting sample, and analyzing the distribution rule of different elements by using an energy disperse spectroscopy; (3) redesigning alloy components according to distribution characteristics of different elements; and (4) the optimized new alloy components are prepared into cast ingots, and the refractory high-entropy alloy subjected to strengthening and toughening regulation and control is obtained. Based on the solidification structure characteristics of the alloy, the room temperature brittleness of the WTaMoNb series refractory high-entropy alloy is overcome by directly regulating and controlling the content of segregation elements in the brittle refractory high-entropy alloy; the alloy phase structure is not changed, the microstructure morphology is in a dendritic crystal form, and the comprehensive mechanical properties at room temperature and high temperature are improved. The invention provides a new thought and a new method for solving the problem of room-temperature brittleness of the refractory high-entropy alloy.

Description

technical field [0001] The invention relates to a strengthening and toughening control method of an alloy, in particular to a strengthening and toughening control method of a refractory high-entropy alloy. Background technique [0002] With the popularity of the concept of high entropy, the multi-principal alloying strategy has continuously refreshed the performance limits that are difficult to achieve with traditional alloys. Excellent high-temperature structural stability is one of the most attractive properties of high-entropy alloys (Cantor alloys). Through entropy control, phase composition design, post-treatment (such as aging treatment), grain boundary strategy, etc., the high-temperature mechanical properties of the Cantor alloy system have been greatly optimized. However, as a potential replacement material for nickel-based superalloys, the high-temperature mechanical properties of Cantor alloys in the temperature range above 800 °C still do not meet the applicatio...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C30/00
CPCC22C1/02C22C30/00C22C27/04C22C27/02
Inventor 沈宝龙孙博梁秀兵王倩倩陈永雄张志彬
Owner SOUTHEAST UNIV
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