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A kind of cualmn shape memory alloy and preparation method thereof

A memory alloy and alloy composition technology, applied in the field of alloy materials and its preparation, can solve the problems of uncontrollable grain orientation, difficult control of single crystal grain orientation, abnormal grain growth, etc., and achieve low cost, easy operation, The effect of simple process

Active Publication Date: 2022-06-21
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the cyclic heat treatment process of CuAlMn shape memory alloy cannot control the grain orientation, resulting in only 5% superelasticity of the 70mm single crystal rod of Kusama T
In the process of single crystal growth, the energy of the sub-grain boundary makes each grain grow abnormally. Due to the randomness of the grain orientation, the grain orientation of the last single crystal is not easy to control.

Method used

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  • A kind of cualmn shape memory alloy and preparation method thereof
  • A kind of cualmn shape memory alloy and preparation method thereof
  • A kind of cualmn shape memory alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Select oxygen-free Cu (purity=99.95%), electrolytic Al (purity=99.99%) and electrolytic Mn (purity=99.90%) as raw materials, the alloy composition is 17at.% Al, 10at.% Mn, and the rest are Cu, Put it in a copper crucible of a vacuum induction melting furnace, vacuumize it, and perform arc melting. After repeated melting for 4-5 times, suction casting is performed to obtain a rod-shaped ingot with a diameter of 20 mm.

[0036] Put the ingot into the heat treatment furnace for solution treatment at 800°C for 60min, start hot rolling, press down 2mm for each pass and put it into the heat treatment furnace for 10min after each pass is completed, until the sample thickness is 2mm and stop (reduction rate is 90 %), returned to the furnace for 10 minutes, water quenched, and then cut several standard tensile samples with wire EDM.

[0037] The sample is cyclically stretched on the stretching machine, and each cycle is loaded with 1% and then unloaded. The cycle stops when the ...

Embodiment 2

[0040] Select oxygen-free Cu (purity=99.95%), electrolytic Al (purity=99.99%) and electrolytic Mn (purity=99.90%) as raw materials, the alloy composition is 17at.% Al, 10at.% Mn, and the rest are Cu, Put it in a copper crucible of a vacuum induction melting furnace, vacuumize it, and perform arc melting. After repeated melting for 4-5 times, suction casting is performed to obtain a rod-shaped ingot with a diameter of 20 mm.

[0041]Put the ingot into the heat treatment furnace for solution treatment at 800°C for 60min, start hot rolling, press down 2mm for each pass and put it into the heat treatment furnace for 10min after each pass is completed, until the sample thickness is 2mm and stop (reduction rate is 90 %), returned to the furnace for 10 minutes, water quenched, and then cut several standard tensile samples with wire EDM.

[0042] The samples were cyclically stretched on a stretching machine, each cycle was loaded with 1% and then unloaded, and the cycle was stopped wh...

Embodiment 3

[0046] Select oxygen-free Cu (purity=99.95%), electrolytic Al (purity=99.99%) and electrolytic Mn (purity=99.90%) as raw materials, the alloy composition is 17at.% Al, 10at.% Mn, and the rest are Cu, Put it in a copper crucible of a vacuum induction melting furnace, vacuumize it, and perform arc melting. After repeated melting for 4-5 times, suction casting is performed to obtain a rod-shaped ingot with a diameter of 20 mm.

[0047] Put the ingot into the heat treatment furnace for solution treatment at 800°C for 60min, start hot rolling, press down 2mm for each pass and put it into the heat treatment furnace for 10min after each pass is completed, until the sample thickness is 2mm and stop (reduction rate is 90 %), returned to the furnace for 10 minutes, water quenched, and then cut several standard tensile samples with wire EDM.

[0048] The sample is cyclically stretched on the stretching machine, and each cycle is loaded with 1% and then unloaded. The cycle stops when the ...

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Abstract

The invention provides a CuAlMn shape memory alloy and a preparation method thereof, the composition is 10.0at.%-25.0at.% of Al, 7.0at.%-17.0% of Mn, and the rest is Cu; (1) select Cu, Al and Mn is used as a raw material for arc melting to obtain ingots; (2) the ingots are put into a heat treatment furnace for solid solution treatment; (3) the samples are stretched cyclically on a stretching machine, and each cycle is loaded with 1% and then unloaded, and cycled to The residual strain is 0.1‑5%; (4) Cool the stretched sample after aging treatment to precipitate the α phase, and then water quench after solution treatment; (5) Repeat steps (3) and (4) to combine heat treatment through deformation Combining methods to obtain highly elastic CuAlMn shape memory alloys. In the invention, through repeated deformation and heat treatment, the superelastic grain orientation screening is realized, and the polycrystalline CuAlMn shape memory alloy with high superelasticity is obtained.

Description

technical field [0001] The technical scheme of the invention belongs to the field of alloy materials and preparation thereof, in particular to a CuAlMn shape memory alloy and a preparation method. Background technique [0002] Shape memory alloy is an intelligent functional material that integrates sensing and driving functions. It is widely used in many fields such as electronic communication, medical and health care, machinery manufacturing, aerospace, energy and chemical industry, civil construction and daily life. Cu-based shape memory alloys have many advantages, such as excellent shape memory effect, low price (only 1 / 10 of Ni-Ti alloy), good electrical and thermal conductivity, and wide adjustable range of phase transformation. Memory alloys have problems such as poor plasticity, prone to grain boundary cracking, short fatigue life, and low strength, which seriously restrict their application range. The root causes of grain boundary cracking in common polycrystalline...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/01C22C9/05C22C1/02C22F1/08B23P15/00
CPCC22C9/01C22C9/05C22C1/02C22F1/08C22F1/002B23P15/00
Inventor 崔烨张中武李星豪连宏凯张春毅孙利昕张洋陈丹
Owner HARBIN ENG UNIV
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