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Second-phase electrical stimulation nodulizing method for Ni-enriched TiNi shape memory alloy

A memory alloy and electric stab technology is applied in the field of second phase electric stimulation spheroidization of Ni-rich TiNi shape memory alloy, which can solve the problems of reducing the recovery force of the alloy phase transformation and the recoverable strain value, and achieves the avoidance of heating and cooling. Effect

Active Publication Date: 2013-02-06
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

Ti obtained by conventional heat treatment 3 Ni 4 The existence of the phase leads to the appearance of multi-stage martensitic phase transformation, which reduces the recovery force and recoverable strain value of the alloy phase transformation

Method used

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  • Second-phase electrical stimulation nodulizing method for Ni-enriched TiNi shape memory alloy
  • Second-phase electrical stimulation nodulizing method for Ni-enriched TiNi shape memory alloy
  • Second-phase electrical stimulation nodulizing method for Ni-enriched TiNi shape memory alloy

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Embodiment Construction

[0017] The technical scheme of the present invention will be described in further detail below in conjunction with accompanying drawing and embodiment:

[0018] See attached figure 1 As shown, this kind of Ni-rich state TiNi shape memory alloy second-phase electrical stimulation spheroidization method is characterized in that: the steps of the method are:

[0019] (1) The atomic percentage of the Ni content in the Ni-rich state TiNi shape memory alloy is greater than or equal to 50.8%;

[0020] (2) Pass the strip or plate 3 of TiNi shape memory alloy through the uncoiling device 5, winding device 6, roll 2 and two sets of support rolls 1 of the rolling mill to realize the two-way movement of the strip or plate 3, the strip or plate 3 and the roll 2 And there is elastic contact between the two sets of support rolls 1, there must be close elastic contact between the roll 2 and the TiNi alloy strip or plate 3, the alloy strip or plate 3 does not undergo plastic deformation, and ...

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Abstract

The invention provides a second-phase electrical stimulation nodulizing method for Ni-enriched TiNi shape memory alloy. The method comprises steps as follows: driving the TiNi memory alloy belt or plate to move at a certain speed by a roller through electric plasticity roller; inputting high-energy pulse current output by a pulse power supply to an electrifying part of the moving TiNi alloy through an electrode; and carrying out joule heating effect and electron wind non-thermal effect on the electrifying part, so as to transform the internal microscopic structure from the initial sheet sor polygonal second phase to uniformly distributed spherical second phase while being subjected to solution treatment. The processed TiNi alloy belt or the plate can be cooled by air at room temperature. According to the method, the implementation time is short, the production efficiency is high, and the TiNi alloy is prevented from oxidizing at high temperature.

Description

technical field [0001] The invention relates to a Ni-rich state TiNi shape memory alloy second-phase electrical stimulation spheroidization method, which belongs to the technical field of metal special heat treatment. Background technique [0002] Shape memory alloys have dual functions of sensing and driving, and are the best choice for realizing the miniaturization and intelligence of mechanical structures. In particular, TiNi-based shape memory alloys have rich phase transition phenomena, excellent shape memory and superelastic properties, With good mechanical properties, corrosion resistance and high damping characteristics, it has the most application prospects as a solid-state drive. In Ni-rich state (≥50.6at.%) TiNi alloy, Ti 3 Ni 4 The phase characteristics (volume fraction, morphology and distribution) play a key role in the R transformation and the distribution of the matrix Ni content in the martensitic transformation characteristics of the alloy. Ti obtained b...

Claims

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Application Information

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IPC IPC(8): C22F3/00C22C19/03
Inventor 官磊刘大博成波
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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