High-entropy alloy preparation method based on selective laser melting technology

A laser selective melting and high-entropy alloy technology, which is applied in metal processing equipment, transportation and packaging, additive processing, etc., can solve the limitations of high-entropy alloy complex structural parts preparation and industrial application, large performance impact, composition segregation, etc. problems, to achieve the effect of excellent comprehensive mechanical properties, high material utilization rate and high density

Active Publication Date: 2020-11-03
SHANGHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, the research on high-entropy alloy materials and their preparation technology is still in its infancy. The existing high-entropy alloy methods are mostly traditional vacuum arc melting, powder metallurgy and mechanical alloying. The as-cast high-entropy alloys prepared by such methods Alloys are simple in shape, small in size and prone to component segregation, and have macroscopic defects such as pores and inclusions, which have a great impact on their performance, which limits the preparation and industrial application of complex structural parts of high-entropy alloys

Method used

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  • High-entropy alloy preparation method based on selective laser melting technology
  • High-entropy alloy preparation method based on selective laser melting technology
  • High-entropy alloy preparation method based on selective laser melting technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In the atomization equipment, a high-speed inert gas argon gas flow is used to impact the pre-alloyed (FeCoNi) in a molten state 86 al 7 Ti 7 High entropy alloy, under the action of gas flow (FeCoNi) 86 al 7 Ti 7 The high-entropy alloy metal liquid is broken into metal droplets and sprayed, and under the physical action of the liquid surface tension, a small-sized and round-shaped melt is gradually formed, and then spherical or nearly spherical (FeCoNi) is obtained after cooling and solidification. 86 al 7 Ti 7 High entropy alloy powder.

[0050] Use the computer-aided 3D design software Solidworks to carry out the 3D design of the parts and create and output STL format files. The size of the block is 10mm×10mm×10mm and the tensile sample of the standard size is used. The slicing software Magics is used to slice the 3D part data. And output the CLI format file, use the RP64 software to fill the laser scanning path planning of the slice file and convert it into an...

Embodiment 5

[0055] The difference from Example 1 is that a heat treatment equipment is used to heat-treat the high-entropy alloy obtained with a predetermined size, wherein the heat treatment equipment is a muffle furnace, the heat treatment temperature is 780°C, the heat treatment time is 4h, and water quenching. The specific parameters are as follows Table 1.

[0056] For (FeCoNi) prepared by gas atomization technology 86 al 7 Ti 7 The high-entropy alloy powders were dried and scanned by a tungsten filament microscope to obtain the surface morphology of the powders, such as figure 1 shown.

[0057] The high-entropy alloy sample prepared based on laser selective melting technology was polished and scanned by a tungsten filament microscope to obtain the surface morphology of the sample, such as image 3 shown.

[0058] Tensile tests were carried out on tensile samples of standard dimensions of high-entropy alloys prepared with different parameters and before and after heat treatment ...

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Abstract

The invention discloses a high-entropy alloy preparation method based on a selective laser melting technology. The method comprises the following step that a, according to the preparation requirementof the (FeCoNi)xAlyTiz high-entropy alloy, metal components are subjected to atom proportioning, and after the metal components are molten by heating, (FeCoNi)xAlyTiz high-entropy alloy powder is prepared through a gas atomization technology. According to the high-entropy alloy preparation method based on the selective laser melting technology, a prepared part has the characteristics of being diversified, high in precision, high in density and the like; and meanwhile, due to the high melting and solidification rate (103-108 K / s), the part can obtain unique microstructures such as ultra-fine grain structures, metastable phases and supersaturated solid solutions, and the comprehensive mechanical properties of the part are excellent.

Description

technical field [0001] The invention relates to the technical field of preparation of high-entropy alloys, in particular to a method for preparing high-entropy alloys based on laser selective melting technology. Background technique [0002] With the continuous innovation and rapid development of industrial technology, the use environment of industrial parts is becoming increasingly severe and harsh, so higher requirements are put forward for the performance of metal materials. Traditional pure metals and their alloys are limited by the number of elements and cannot meet the needs of industrialization and social development. Under this condition, high-entropy alloys emerged as the times require. As a new system of multi-principal alloy materials, high-entropy alloys have become the focus of attention in the field of metal materials because of their single solid solution structure, excellent mechanical properties, good thermal stability, corrosion resistance and wear resistan...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F9/08B22F1/00B33Y10/00B33Y70/00C22C30/00C22C1/04
CPCB22F9/082B33Y10/00B33Y70/00C22C30/00C22C1/04B22F1/065
Inventor 贾延东王振辉王刚
Owner SHANGHAI UNIV
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