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Molded body of cu-al-mn shape memory alloy and method for producing the same

一种cu-al-mn、1.cu-al-mn的技术，应用在Cu-Al-Mn系形状记忆合金的成型体领域，能够解决螺纹精度变差、形状变形、无法充分发挥超弹性等问题，达到耐疲劳特性及耐断裂特性优异的效果

Active Publication Date: 2022-08-05
FURUKAWA TECHNO MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the rolling method that can use shape memory alloys, in terms of shape memory characteristics, it can be considered to use martensitic phase for processing to make it appear plastically deformed, but due to heating to the reverse transformation temperature In the case of the above, shape deformation occurs, so thread accuracy deteriorates
In addition, since superelasticity does not cause plastic deformation due to its nature, if the processed structure is removed by annealing to allow plastic deformation in the final process, there is a tendency that the superelasticity cannot be fully exerted.

Method used

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  • Molded body of cu-al-mn shape memory alloy and method for producing the same
  • Molded body of cu-al-mn shape memory alloy and method for producing the same
  • Molded body of cu-al-mn shape memory alloy and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0153] As a Cu-Al-Mn-based alloy, Al: 8.2 mass %, Mn: 10.7 mass %, and the remainder of the molded body raw material (Alloy No. 1 in Table 1) was used.

[0154] The material was melted and cast in a high-frequency vacuum melting furnace, hot forged at 800°C, hot rolled at 600°C, intermediate annealed at 520°C, cold drawn with a cold working rate of 40%, and produced with a diameter of 14 mm , Bars with a length of 300mm. The bar was heated to 500°C at a heating rate of 10°C / min in an electric furnace, held at 500°C for 1 hour, then reached 900°C at a temperature increase rate of 1.0°C / min, held at 900°C for 10 minutes, and then cooled by a 1.0°C / min to reach 500°C, hold at 500°C for 1 hour, then reach 900°C at a heating rate of 1.0°C / min, hold for 1 hour, and then quench in water to obtain a single crystal with a length of 300mm and a crystal structure It is a bar of A2 type structure. Then, by lathe machining and centerless grinding, the bar with a diameter of 14mm is made ...

Embodiment 8～11

[0159] The manufacturing method was the same as that of Example 4, except that the heat treatment temperature after thread rolling was 60° C., 80° C., 300° C., and 400° C., respectively, and the heat treatment time was 30 minutes of aging heat treatment. Each of the above-mentioned evaluations was performed on the obtained threaded rod. The obtained results are shown in Table 4.

[0160] As a result, as shown in Table 4, in Examples 8 to 11, threading was possible, and especially in Examples 9 and 10, excellent superelasticity, fatigue resistance, and fracture resistance were obtained. In Example 8, the heat treatment temperature after the thread rolling process is low, from the disordered A2 type structure to the ordered structure L2 1 Insufficient change of the shape structure, insufficient superelasticity, and large superelastic residual strain. As a result of Example 11, the heat treatment temperature after thread rolling was high, the Vickers hardness ratio (Hs / Ho ratio...

Embodiment 12～40

[0162] The production method was the same as that of Example 4, but as the components of the Cu-Al-Mn-based alloy, the blending amounts of Al and Mn, and the types and blending amounts of optional additional elements were changed as shown in Tables 1 to 3. Composition (Alloy Nos. 2 to 30 in Tables 1 to 3). Each of the above-mentioned evaluations was performed on the obtained threaded rod. The obtained results are shown in Tables 5 and 6.

[0163] [table 5]

[0164]

[0165] [Table 6]

[0166]

[0167] As a result, as shown in Tables 5 and 6, in Examples 12 to 40, threading was possible. In particular, Examples 13 to 40 had good superelasticity, fatigue resistance, and fracture resistance. In addition, as a result of Example 12, the Al content was slightly high, and the fracture resistance was poor.

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Abstract

The formed body of the Cu-Al-Mn-based shape memory alloy of the present invention has a threaded portion, and the threaded portion is a rolled portion. In addition, the method for producing a Cu-Al-Mn-based shape memory alloy molded body of the present invention includes a step of subjecting at least a part of the raw material of the molded body to plastic working in a state where the crystal structure is an A2 type structure by rolling to shape it. , implemented to make it L2 1 The heat treatment of the type structure, thereby forming a threaded portion exhibiting superelastic properties. The threaded portion can be formed with good workability, and is excellent in fatigue resistance and fracture resistance.

Description

technical field [0001] The present invention relates to a molded body of a Cu-Al-Mn-based shape memory alloy and a method for producing the same. In detail, the present invention relates to a molded body of a Cu-Al-Mn-based shape memory alloy having a threaded portion that can be formed with good workability and excellent in fatigue resistance, and a method for producing the same. Background technique [0002] A shape memory alloy refers to a metal material that can be restored to a shape before deformation by a temperature change or unloading of the applied stress. The properties possessed by shape memory alloys can be classified into the following two categories: properties of returning to the shape before deformation by heating the deformed material (this property is called "shape memory effect".); and, even if A characteristic of deforming by applying a strain exceeding the maximum elastic strain under a load, and restoring the shape to the shape before deformation by u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/01C22C9/05F16B35/00C22F1/00C22F1/08B21H3/02
CPCC22C9/05F16B35/00C22C9/01C22F1/08B21H3/02F16B2200/77
Inventor 喜濑纯男田中丰延闰间谦次石川浩司片冈奈奈美横山重和东田丰彦东义敬
Owner FURUKAWA TECHNO MATERIAL
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