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A kind of cocrfenimn high-entropy alloy reinforced by self-generated nanoparticles in situ and its preparation method

A nano-particle and high-entropy alloy technology, applied in the field of metal processing, can solve the problems of uneven temperature distribution, improve powder consolidation, and small product size, and achieve the effects of avoiding volatilization and segregation, improving material strength and increasing strength.

Active Publication Date: 2021-08-17
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing particle-strengthened high-entropy alloys are prepared by high-energy ball milling and spark plasma sintering. Although this process can effectively introduce particles, it can also use refined grains to further improve the material. Strength, but spark plasma sintering equipment, its price is more expensive, and the size of the prepared product is still small
Moreover, limited by the existing mold materials, the pressure that can be applied during the sintering process is usually only tens of MPa, which is not conducive to improving the consolidation of the powder
In addition, during the spark plasma sintering process, there are relatively uneven temperature distributions on the macroscopic and microscopic dimensions (powder boundaries) of the sample, which will lead to uneven material properties.
These factors limit the industrial mass production application of high-entropy alloys prepared by spark plasma sintering.

Method used

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  • A kind of cocrfenimn high-entropy alloy reinforced by self-generated nanoparticles in situ and its preparation method
  • A kind of cocrfenimn high-entropy alloy reinforced by self-generated nanoparticles in situ and its preparation method
  • A kind of cocrfenimn high-entropy alloy reinforced by self-generated nanoparticles in situ and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Preparation of TiO(C) particle reinforced CoCrFeNiMn high-entropy alloy

[0029] Put Co, Cr, Fe, Ni, Mn, FeTi powder and 0.5wt% stearic acid into a planetary ball mill, first ball mill at 200rpm for 6 hours, and then at 400rpm for 66 hours. After ball milling, under an inert gas protective atmosphere, take an appropriate amount of ball-milled powder and put it into the first mold, and press it into a prefabricated block with a hydraulic press. The pressure of the hydraulic press is 1150 MPa, and the holding time is 5 minutes. Further, the prefabricated block was placed in a stainless steel sheath, and transferred to an induction heating coil for induction heating, with a heating temperature of 1150°C and a holding time of 2 minutes. Subsequently, put the heated prefabricated block into the second mold, and use a hydraulic press for hot extrusion. The preheating temperature of the second mold during extrusion is 450°C, and the extrusion ratio is 9:1. The cros...

Embodiment 2

[0031] Embodiment two: (Cr, Mn) 3 o 4 Preparation of CoCrFeNiMn High Entropy Alloy Strengthened by +NbC Particles

[0032] Put Co, Cr, Fe, Ni, Mn, Nb powders and 0.5wt% stearic acid into a planetary ball mill, first ball mill at 200rpm for 6 hours, then at 400rpm for 66 hours. After ball milling, under an inert gas protective atmosphere, take an appropriate amount of ball-milled powder and put it into the first mold, and press it into a prefabricated block with a hydraulic press. The pressure of the hydraulic press is 1150 MPa, and the holding time is 5 minutes. Further, the prefabricated block was placed in a stainless steel sheath, and transferred to an induction heating coil for induction heating, with a heating temperature of 1150°C and a holding time of 2 minutes. Subsequently, put the heated prefabricated block into the second mold, and use a hydraulic press for hot extrusion. The preheating temperature of the second mold during extrusion is 450°C, and the extrusion ra...

Embodiment 3

[0034] Example 3: Preparation of TiO(C) particle reinforced CoCrFeNiMn high-entropy alloy

[0035]Put Co, Cr, Fe, Ni, Mn, FeTi powder and 0.5wt% stearic acid into a planetary ball mill, first ball mill at 200rpm for 6 hours, and then at 400rpm for 66 hours. After ball milling, under an inert gas protective atmosphere, take an appropriate amount of ball-milled powder and put it into the first mold, and press it into a prefabricated block with a hydraulic press. The pressure of the hydraulic press is 1150 MPa, and the holding time is 5 minutes. Further, the prefabricated block was placed in a stainless steel sheath, and transferred to an induction heating coil for induction heating. The heating temperature was 1050° C., and the holding time was 5 minutes. Subsequently, put the heated prefabricated block into the second mold, and use a hydraulic press for hot extrusion. The preheating temperature of the second mold during extrusion is 450°C, and the extrusion ratio is 9:1. The c...

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Abstract

An in-situ nanoparticle-enhanced CoCrFeNiMn high-entropy alloy and a preparation method thereof. The CoCrFeNiMn high-entropy alloy combines fine-grain strengthening and particle strengthening at the same time, and the synergistic effect of the two effectively improves the strength of the material, and its yield strength Significantly higher than ordinary CoCrFeNiMn alloys. The preparation method of the CoCrFeNiMn high-entropy alloy combines high-energy ball milling and hot extrusion technology, and uses the high-energy ball milling method to achieve alloying of elements, avoids volatilization and segregation of elements in the process of melting and casting, and refines crystal grains; The hot extrusion process achieves rapid powder consolidation and in-situ self-generated nanoparticles to prepare CoCrFeNiMn high-entropy alloys with both nano-particles and fine-grained structures, which effectively improves the material strength of CoCrFeNiMn high-entropy alloys. In addition, the method can directly use the existing industrial equipment for producing ODS superalloy, the cost is low, the size is not limited, and it is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of metal processing, and in particular relates to a CoCrFeNiMn high-entropy alloy reinforced by in-situ self-generated nanoparticles and a preparation method thereof. Background technique [0002] In recent years, high-entropy alloys have attracted great attention in the field of new metal materials due to their unique alloy design ideas and organizational structures. Its multi-element alloy design idea greatly increases the types of metal materials and provides a new idea for the development of new alloys. At the same time, its thermodynamic high-entropy effect, kinetic hysteresis diffusion effect, microstructure lattice distortion effect and performance cocktail effect make high-entropy alloys have many characteristics that traditional alloys do not have. [0003] So far, researchers at home and abroad have developed many systems of high-entropy alloys. Among the existing high-entropy alloys, the CoCrFeNi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C32/00C22C1/05B22F9/04B22F3/20
CPCB22F3/20B22F9/04B22F2003/208B22F2009/043C22C1/058C22C30/00C22C32/0005C22C32/0089
Inventor 梁加淼谢跃煌张德良
Owner SHANGHAI JIAOTONG UNIV
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