Method for preparing low nickel content ternary TiNiHf shape memory alloy sheet material

A memory alloy and plate technology, applied in the field of low-nickel binary TiNi and ternary TiNiHf shape memory alloy plate preparation, to achieve the effects of modifying defects, preventing oxygenation, and controlling interaction

Inactive Publication Date: 2010-05-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

However, for the preparation of low-nickel TiNi alloys, the yield is extremely low, and there are great disadvantages: there are peritectic reactions such as L+TiNi→Ti2Ni in low-nickel TiNi-based alloys, resulting in A large number of secondary shrinkage cavities and serious shrinkage defects appear in the alloy during solidification, as shown in Figure 1(a)-(b)
These defects seriously deteriorate the hot workability of the alloy, and the ingot is easily cracked and scrapped during the forging process

Method used

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  • Method for preparing low nickel content ternary TiNiHf shape memory alloy sheet material

Examples

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Embodiment 1

[0028] Preparation of low-nickel ternary TiNiHf shape memory alloy sheets. The alloy was smelted on a 25kg vacuum induction furnace, and the 11mm thick plate was prepared through ingot surface treatment, ingot forging modification, defect removal, forging and rolling. Chemical composition is as table 1, and its preparation process is:

[0029] 1. The raw materials are sponge body, electrolytic nickel, and metal hafnium rods.

[0030] 2. Put the above raw materials into a CaO crucible for vacuum induction melting.

[0031] 3. The casting mold is a conical cast steel mold, and it is covered with thermal insulation material. Before casting, it is placed in a resistance furnace for 500-600°C / 3-5h heat preservation treatment (550°C / 4h in this example), and the power supply for smelting The frequency is in the range of 2000-5000Hz (3000Hz in this embodiment), and the vacuum degree is 1Pa; after the smelting, infrared and contact thermocouples are used for temperature measurement. ...

Embodiment 2

[0040] The difference from Example 1 is that the prepared low-nickel binary TiNi alloy sheet has a thickness of 3 mm and its composition is shown in Table 2.

[0041] Table 2 Composition of low-nickel binary TiNi shape memory alloys

[0042] element Ni f Ti O C element Ni Ti O C Nominal Composition (at%) 49.6 50.4 Measured composition (wt%) 54.5 Remain 0.052 0.011

[0043] [0042] The steel mold is subjected to heat preservation treatment at 600°C / 4h. The power frequency for alloy smelting is 3300Hz; after smelting, infrared and contact thermocouples are used to measure the temperature, and when the superheat reaches 120°C, casting is carried out; the forging temperature is 870°C, the forging speed is 2mm / s, and the deformation per fire is 5%. , Return to the furnace and anneal for 20 minutes (temperature 850-870°C), each heat deforms once along the circumferential direction of the ingot at a vertical angle ...

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Abstract

The invention relates to a technology for preparing a TiNi-based shape memory alloy sheet, in particular to a method for preparing a low-nickel binary TiNi and ternary TiNiHf shape memory alloy sheet.The technology takes titanium sponge, electrolytic nickel and a hafnium sheet as raw materials, and adopts a ceramic crucible which is formed by CaO to carry out vacuum induction melting, and the power frequency for melting is controlled to between 2,000 and 5,000 Hz and the superheat degree of an alloy liquid is controlled to between 50 and 180 DEG C under the condition of casting; static liquidforging press is adopted for modification of cast ingot tissues; forged ingots are slivered along the vertical direction from the intermediate part, and forged cracks caused by secondary hole shrinkage are completely eliminated; the forged ingots after elimination of the surface defects are forged at a temperature of between 840 and 900 DEG C; and unilateral rolling is adopted. The technology cangreatly improve the finished product rate of the low-nickel binary TiNi and ternary TiNiHf shape memory alloy sheet; and the alloy sheet prepared has superior internal quality, mechanical property and stable phase transition temperature.

Description

technical field [0001] The invention relates to a preparation technology of a TiNi-based shape memory alloy plate, in particular to a preparation method of a low-nickel binary TiNi and ternary TiNiHf shape memory alloy plate. [0002] Background technique [0003] At present, the technical route adopted for preparing TiNi-based shape memory alloy sheets at home and abroad is: vacuum induction melting-casting-forging-rolling-finished sheets. This technology is relatively mature for the preparation of nickel-rich TiNi alloy, and the yield is high. However, for the preparation of low-nickel TiNi alloys, the yield is extremely low, and there are great disadvantages: in low-nickel TiNi-based alloys, such as L+TiNi→Ti 2 The peritectic reaction of Ni causes a large number of secondary shrinkage cavities and serious shrinkage porosity defects in the alloy during solidification, as shown in Figure 1(a)-(b). These defects seriously deteriorate the hot workability of the alloy, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02B22D21/00C22F1/00
Inventor 赵明久戎利建闫德胜高明马颖澈刘奎
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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