Fe-Mn-Si-Cr-Ni based shape memory alloy and preparation method thereof

A technology of fe-mn-si-cr-ni and memory alloy, which is applied in the field of composite materials, can solve the problems that have not yet obtained general rules and less research, and achieve the effect of improving mechanical properties and shape memory effect and preventing volatilization

Active Publication Date: 2020-04-10
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few studies on the preparation of Fe-Mn-Si-based shape mem

Method used

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  • Fe-Mn-Si-Cr-Ni based shape memory alloy and preparation method thereof
  • Fe-Mn-Si-Cr-Ni based shape memory alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1

[0024] S1. A raw material composed of Fe-20Mn-6Si-8Cr-5Ni (ie Mn powder 20wt.%, Si powder 6wt.%, Cr powder 8wt.%, Ni powder 5wt.%, the balance being Fe powder) in mass percentage After putting the powder in a stainless steel ball mill tank, add industrial ethanol as a dispersant. Add 0.2-0.5mL of dispersant to every 10g of powder. The ball-to-battery ratio is 20:1. The ball milling medium is a stainless steel ball of 10mm. Transition in the glove box. After repeated air purging in the warehouse, it is put into the operation chamber of the ball mill. The gas used is argon. Cover with a sealing cap to ensure that the tube is taken out under the argon atmosphere and put into the ball mill. The ball mill speed is 400r / min. Intermittent ball mill is adopted. That is, after every 60 minutes of ball milling, stopping for 30 minutes, alternately, ball milling the alloy powder made for 50 hours.

[0025] S2. Fill the mixed powder obtained in step S1 into a cemented carbi...

Example Embodiment

[0026] Example 2

[0027] The mixed powder obtained in step S1 of Example 1 was filled into a cemented carbide mold for pre-compression, the pre-compression pressure was 400 MPa, and the pre-compression was 20 seconds, and then the pre-compressed sample was loaded into a graphite mold for discharge plasma (SPS) Sintering, the sintering pressure is 40MPa, the vacuum degree is 10Pa, the sintering temperature is 950℃, the heating rate is 10℃ / min, the holding time is 30min, and then the temperature is reduced and the pressure is relieved to obtain Fe-Mn-Si-Cr-Ni based shape memory alloy.

Example Embodiment

[0028] Example 3

[0029] The mixed powder obtained in step S1 of Example 1 was filled into a cemented carbide mold for pre-compression, the pre-compression pressure was 400 MPa, and the pre-compression was 20 seconds, and then the pre-compressed sample was loaded into a graphite mold for discharge plasma (SPS) Sintering, the sintering pressure is 40MPa, the vacuum degree is 20Pa, the sintering temperature is 950℃, the heating rate is 30℃ / min, the holding time is 60min, then the temperature is reduced and the pressure is relieved to obtain Fe-Mn-Si-Cr-Ni based shape memory alloy.

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Abstract

The invention discloses a Fe-Mn-Si-Cr-Ni based shape memory alloy and a preparation method thereof, and belongs to the technical field of composite materials. The Fe-Mn-Si-Cr-Ni based shape memory alloy is prepared from the raw materials in percentage by weight: 12-30% of Mn powder, 3-6% of Si powder, 0-12% of Cr powder, 0-6% of Ni powder, and the balance of Fe powder. During preparation, the Fe powder, the Mn powder, the Si powder, the Cr powder and the Ni powder are firstly subjected to ball-milling mixing and then pre-pressed, then a pre-pressed sample is subjected to spark plasma sintering(SPS), the sintering pressure is 20-50 MPa, the sintering temperature is 800-1000 DEG C, heat preservation is conducted for 5-60 min, then cooling and pressure relief are conducted, and thus the Fe-Mn-Si-Cr-Ni based shape memory alloy is prepared. The Fe-Mn-Si-Cr-Ni based alloy has good mechanical performance and a good shape memory effect.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a Fe-Mn-Si-Cr-Ni base shape memory alloy and a preparation method thereof. Background technique [0002] At present, the traditional melting and casting process is mostly used to prepare Fe-based shape memory alloys, especially the five-element Fe-Mn-Si-Cr-Ni shape memory alloy. The refractory of the alloy often makes its composition difficult to control, followed by time-consuming homogenization treatment, cracks caused by cooling shrinkage during solidification and quenching, temper embrittlement, etc., resulting in poor plasticity of the alloy and difficult cold working, thus limiting its Engineering Applications. The powder metallurgy method can well avoid these defects. It can precisely control the alloy composition, reduce the segregation of the composition, increase the solid solubility of the alloy elements in the Fe matrix, and avoid the formation of oxides. E...

Claims

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Application Information

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IPC IPC(8): C22C33/02B22F3/105B22F9/04C22C38/34C22C38/58
CPCB22F3/105B22F9/04B22F2009/043C22C33/0278C22C38/34C22C38/58
Inventor 李艳国邹芹王明智邹娟赵玉成邹良华党赏
Owner YANSHAN UNIV
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