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CN-122012986-A - Alloy material with wide temperature range and low resistance temperature coefficient and preparation method thereof

CN122012986ACN 122012986 ACN122012986 ACN 122012986ACN-122012986-A

Abstract

The invention relates to the technical field of alloy materials, and discloses an alloy material with wide temperature range and low resistance temperature coefficient and a preparation method thereof, wherein the alloy material consists of composite beta-stable elements, rare earth modified elements, neutral regulating elements, alpha-stable elements, hf-B composite doping elements, and the balance of Ti and unavoidable impurities; according to the invention, through reasonably optimizing the component proportion of the alloy, a synergistic effect is formed among the composite beta-stabilizing element, the rare earth modifying element, the neutral regulating element, the alpha-stabilizing element and the Hf-B composite doping element, and all the elements are mutually matched at a microscopic level, so that the alloy performance is improved from multiple dimensions such as phase structure stabilization, grain refinement, solid solution strengthening, dispersion strengthening and the like, and finally, the core goal of macroscopic wide temperature range and low resistance temperature coefficient is realized. Meanwhile, the optimized preparation process and the component design complement each other, so that the full play of the actions of each element and the uniformity and stability of the alloy tissue structure are ensured.

Inventors

  • SONG JINGJING
  • CHEN YU
  • ZHENG ZHIMIN
  • QU SUPING
  • WEI TIANTIAN
  • GAO LU

Assignees

  • 蚌埠学院
  • 深圳市毫欧电子有限公司

Dates

Publication Date
20260512
Application Date
20260302

Claims (10)

  1. 1. The alloy material with wide temperature range and low resistance temperature coefficient is characterized by comprising, by mass, 18% -35% of composite beta stabilizing element, 0.5% -3% of rare earth modifying element, 5% -12% of neutral regulating element, 0.001% -0.05% of alpha stabilizing element, 0.05% -0.2% of Hf-B composite doping element, and the balance of Ti and unavoidable impurities.
  2. 2. The alloy material of claim 1, wherein the composite beta stabilization element is a mixture of Nb and Ta, and the mass ratio of Nb to Ta is 3-5:1.
  3. 3. The alloy material according to claim 1, wherein the rare earth modifying element is a mixture of Nd and Dy, and a mass ratio of Nd to Dy is 2 to 4:1.
  4. 4. The alloy material according to claim 1, wherein the neutral control element is a mixture of Zr and Sn, and the mass ratio of Zr to Sn is 1-2:1.
  5. 5. The alloy material of claim 1, wherein the alpha stabilizing element is o.
  6. 6. Alloy material according to claim 1, characterized in that the mass ratio of Hf to B in the Hf-B complex doping element is 5-8:1.
  7. 7. The method for preparing the wide-temperature-range low-resistance temperature coefficient alloy material according to any one of claims 1 to 6, comprising the steps of: (1) The preparation method comprises the steps of raw material pretreatment and smelting, namely weighing Ti, nb, ta, nd, dy, zr, sn, hf, B pure metal raw materials with purity not lower than 99.95% according to the component proportion, mixing Hf and B, performing ball milling for 2-3 hours at a rotating speed of 300-400r/min under the protection of argon with purity not less than 99.99% to obtain Hf-B composite powder, placing Ti, nb, ta, nd, dy, zr, sn raw materials and Hf-B composite powder in a vacuum consumable arc furnace, vacuumizing to vacuum degree not more than 0.005Pa, charging argon to pressure of 0.05-0.1MPa, performing three times of smelting with current of 3000-4000A, and performing electromagnetic stirring at a speed of 50-80r/min during each smelting to obtain alloy cast ingots with uniform components; (2) Plastic working, namely carrying out homogenization treatment on an alloy ingot casting at 850-900 ℃ for 2-3 hours, hot forging and cogging at a rate of 5-10mm/s, and air cooling to room temperature after forging; (3) Carrying out multi-stage heat treatment, namely sequentially carrying out solution treatment, sectional aging treatment and low-temperature tempering; (4) And (3) processing a finished product, namely machining the alloy material subjected to the multi-stage heat treatment to remove surface oxide skin, so as to obtain the finished product with the required size.
  8. 8. The method according to claim 7, wherein in the step (2), the solution treatment is performed at 950 ℃ to 1000 ℃ for 1 to 2 hours, and then the solution is quenched with ice water at a cooling rate of not less than 150 ℃ per second.
  9. 9. The method according to claim 7, wherein in the step (2), the step of the sectional aging treatment is carried out for 2 to 3 hours at 300 to 350 ℃ in the first stage and 1 to 2 hours at 400 to 450 ℃ in the second stage.
  10. 10. The method according to claim 7, wherein in the step (2), the low-temperature tempering is carried out at a temperature of 150 ℃ to 200 ℃ for 2 to 3 hours, and then the low-temperature tempering is carried out with furnace cooling at a cooling rate of 5 ℃ to 10 ℃ per hour.

Description

Alloy material with wide temperature range and low resistance temperature coefficient and preparation method thereof Technical Field The invention relates to the technical field of alloy materials, in particular to an alloy material with wide temperature range and low resistance temperature coefficient and a preparation method thereof. Background In the modern industrial fields of aerospace, electronic power, precision instruments and the like, increasingly stringent requirements are put on the material properties of key structural parts and functional parts. Particularly in the scene of wide temperature range service, the material not only needs to have stable electrical performance, but also needs to have good mechanical strength and structural reliability, wherein the low-resistance temperature coefficient is one of core indexes for ensuring the accurate operation of equipment. Titanium alloys have been receiving a great deal of attention in the above fields by virtue of their low density, high specific strength, excellent corrosion resistance, and the like. However, the conventional titanium alloy has a high temperature coefficient of resistance, and in an environment with large temperature fluctuation, the resistance value is easy to change obviously, so that the signal transmission precision and the energy conversion efficiency of equipment are reduced, and even part failure is caused when the signal transmission precision and the energy conversion efficiency are serious. In order to solve the problem, the industry tries to modify the titanium alloy by adding alloy elements, but the prior art has a plurality of defects, and the use requirement of high-end equipment on wide-temperature-range low-resistance temperature coefficient alloy materials cannot be met. Therefore, developing a titanium-based alloy material with reasonable component design, controllable preparation process, capability of keeping low resistance temperature coefficient in a wide temperature range, excellent mechanical property and high temperature stability, and the like becomes an urgent requirement for the development of the current industry. Disclosure of Invention Aiming at the problems in the prior art, the invention provides an alloy material with wide temperature range and low resistance temperature coefficient. The invention solves the technical problems by adopting a technical scheme that the alloy material with wide temperature range and low resistance temperature coefficient comprises, by mass, 18% -35% of composite beta stabilizing element, 0.5% -3% of rare earth modifying element, 5% -12% of neutral regulating element, 0.001% -0.05% of alpha stabilizing element, 0.05% -0.2% of Hf-B composite doping element, and the balance of Ti and unavoidable impurities. As a further technical scheme, the composite beta stabilizing element is a mixture of Nb and Ta, and the mass ratio of Nb to Ta is 3-5:1. As a further technical scheme, the rare earth modified element is a mixture of Nd and Dy, and the mass ratio of Nd to Dy is 2-4:1. As a further technical scheme, the neutral regulating element is a mixture of Zr and Sn, and the mass ratio of Zr to Sn is 1-2:1. As a further technical scheme, the alpha stabilizing element is o. As a further technical scheme, the mass ratio of Hf to B in the Hf-B composite doping element is 5-8:1. The preparation method of the wide-temperature-range low-resistance temperature coefficient alloy material comprises the following steps: (1) The preparation method comprises the steps of raw material pretreatment and smelting, namely weighing Ti, nb, ta, nd, dy, zr, sn, hf, B pure metal raw materials with purity not lower than 99.95% according to the component proportion, mixing Hf and B, performing ball milling for 2-3 hours at a rotating speed of 300-400r/min under the protection of argon with purity not less than 99.99% to obtain Hf-B composite powder, placing Ti, nb, ta, nd, dy, zr, sn raw materials and Hf-B composite powder in a vacuum consumable arc furnace, vacuumizing to vacuum degree not more than 0.005Pa, charging argon to pressure of 0.05-0.1MPa, performing three times of smelting with current of 3000-4000A, and performing electromagnetic stirring at a speed of 50-80r/min during each smelting to obtain alloy cast ingots with uniform components; (2) Plastic working, namely carrying out homogenization treatment on an alloy ingot casting at 850-900 ℃ for 2-3 hours, hot forging and cogging at a rate of 5-10mm/s, and air cooling to room temperature after forging; (3) Carrying out multi-stage heat treatment, namely sequentially carrying out solution treatment, sectional aging treatment and low-temperature tempering; (4) And (3) processing a finished product, namely machining the alloy material subjected to the multi-stage heat treatment to remove surface oxide skin, so as to obtain the finished product with the required size. As a further technical scheme, in the step (2), after the solution treatment