A kind of preparation method of high plasticity tini51 alloy wire

Abstract

The invention discloses a preparation method of a high-plasticity TiNi51 alloy wire material. The method comprises steps of: carrying out medium frequency induction smelting and vacuum self-consuming smelting so that the casting defects of primary ingots are eliminated to obtain pure and uniform cast ingots and moreover titanium and nickel alloy large-scale ingot casting are obtained and the production efficiency and material batch stability are improved further; then, homogenizing the cast ingot at a high temperature so as to reduce the brittle phase of the materials; forging and rolling to form wire blanks; and finally, drawing and correcting to produce the finished wire materials. Compared with the prior art, the method has the following advantages that the technology combining medium frequency induction smelting with vacuum self-consuming smelting is adopted so as to obtain the uniform, pure and large-scale titanium-nickel cast ingots; the brittle phase of the materials is reduced through high-temperature homogenizing treatment; and reasonable heating and finished product correcting technologies are adopted so as to improve the plastic processing performance of the materials. The TiNi51 alloy wire materials with large ingot shape, uniformity, stability and high plasticity are prepared.

Description

technical field [0001] The invention relates to a method for preparing a titanium-nickel wire, in particular to a method for preparing a high-plasticity titanium-nickel shape memory alloy Ti-Ni51at% wire. Background technique [0002] Titanium-nickel-based shape memory alloy is a new type of metal functional material that emerged in the 1960s with three characteristics: shape memory, superelasticity and high damping. It also has excellent biocompatibility. It has been used in electronics, machinery , aerospace, energy, medical care and daily necessities and other fields. [0003] The main application characteristics of equiatomic ratio Ti-Ni alloy materials are superelasticity and shape memory effect, including parameters such as alloy phase transition point, recovery stress and recovery rate, and chemical composition is the most sensitive factor affecting alloy performance. When the Ni content is less than 50.5at%, the superelasticity of Ti-Ni alloy is poor; the higher the...

AI Technical Summary

Problems solved by technology

However, due to the limitations of the smelting equipment itself and the smelting process, small ingots below 20Kg are generally prepared, and the fluidity of the alloy is poor, as well as the limitations of pouring conditions, which inevitably produce defects such as pores and cold shuts, which reduces the processing of materials. performance

TiNi alloy smelting vacuum self-consumption + vacuum induction smelting or vacuum shell solidification + vacuum consumable smelting and other vacuum smelting methods are mostly used for experimental comparison and demonstration, and cannot be transformed due to problems in welding, composition control and production costs. A stable process for manufacturability, not commonly used

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