阅读说明：本技术 高性能锆钛二元合金及其制备方法 (High-performance zirconium-titanium binary alloy and preparation method thereof ) 是由 周云凯 于 2019-11-04 设计创作，主要内容包括：本发明公开一种高性能锆钛二元合金及其制备方法。一种锆钛二元合金由以下成分组成及原子百分比为：锆55-65％,钛45-35％。其制备方法是：其将原材料按原子百分比混合均匀后放置在非自耗熔炼炉中熔炼,熔炼炉充入氩气作为保护气氛。将反复熔炼的铸锭进行高温均匀化处理,随后在箱式电阻炉中加热后对其进行多道次轧制变形,直至合金锭变形量达到70％。在进行完最后一道次轧制变形后,将所得的合金板材放置于大气中冷却至室温。将冷却至室温的合金板材表面进行扒皮、酸洗,表面打磨后得到最终的锆钛二元合金。本发明的抗拉强度达到1052以上,延伸率可达到7％以上,与现有技术相比有较好的综合力学性能,同时具有低密度和良好的耐腐蚀性能等优点。(The invention discloses a high-performance zirconium-titanium binary alloy and a preparation method thereof. The zirconium-titanium binary alloy comprises the following components in percentage by atom: 55-65% of zirconium and 45-35% of titanium. The preparation method comprises the following steps: the raw materials are evenly mixed according to atomic percentage and then placed in a non-consumable smelting furnace for smelting, and argon is filled into the smelting furnace as protective atmosphere. And (3) carrying out high-temperature homogenization treatment on the repeatedly smelted cast ingot, then heating the cast ingot in a box-type resistance furnace, and carrying out multi-pass rolling deformation on the cast ingot until the deformation of the alloy ingot reaches 70%. And after the last rolling deformation, placing the obtained alloy plate in the atmosphere and cooling to room temperature. And peeling and pickling the surface of the alloy plate cooled to room temperature, and polishing the surface to obtain the final zirconium-titanium binary alloy. The tensile strength of the invention reaches more than 1052, the elongation can reach more than 7%, and compared with the prior art, the invention has better comprehensive mechanical property, and simultaneously has the advantages of low density, good corrosion resistance and the like.)

1. A zirconium titanium binary alloy is characterized in that: the zirconium-titanium binary alloy comprises the following components in percentage by atom: 55-65% of zirconium and 45-35% of titanium, wherein the tensile strength of the zirconium-titanium binary alloy can reach 1052-1234 MPa, the elongation can reach more than 7%, and the zirconium-titanium binary alloy has better comprehensive mechanical properties, low density and good corrosion resistance compared with 9Cr18 steel and TC4 titanium alloy.

2. The method for preparing a zirconium titanium binary alloy according to claim, characterized in that: the preparation method comprises the following steps:

(1) the pretreated raw materials are as follows according to atomic percentage: 55-65% of zirconium and 45-35% of titanium are uniformly mixed and then placed in a non-consumable smelting furnace, and the mixture is repeatedly subjected to reverse smelting for 5 times, 5-10 minutes each time, under the protection of argon atmosphere, so as to ensure uniform smelting;

(2) placing the cast ingot in a tubular resistance furnace, introducing argon as a protective atmosphere, heating to 900-1100 ℃, preserving heat for 4-5 hours, cooling along with the tubular resistance furnace after the completion, and performing homogenization annealing as an alloy ingot;

(3) placing the alloy ingot subjected to homogenization treatment into a box-type resistance furnace, heating the resistance furnace to 700-900 ℃, keeping the temperature of the alloy ingot at the temperature for 30-50 minutes, and then quickly transferring the alloy ingot to a double-roller mill for multi-pass rolling deformation; after the first rolling deformation is finished, placing the alloy ingot into a box-type resistance furnace for heat preservation for 3-5 minutes, and then rapidly performing second rolling deformation, so as to perform reciprocating circulation until the reduction deformation of the alloy ingot reaches 70%; after the last deformation, placing the alloy plate in the atmosphere and naturally cooling to room temperature; and peeling and pickling the surface of the alloy plate cooled to room temperature, and polishing the surface to obtain the zirconium-titanium binary alloy.

3. The method for preparing a zirconium titanium binary alloy according to claim 2, characterized in that: the raw materials of zirconium and titanium are subjected to ultrasonic cleaning, and argon is filled in the processes of smelting and annealing treatment to serve as a protective atmosphere.

Technical Field

The invention discloses a novel high-performance zirconium-titanium alloy and a preparation method thereof, belonging to the field of preparation of new materials.

Background

In the fields of aerospace and the like, alloy steel is most widely used as a material for space activity construction. The mainly used alloy steel types are stainless steel, GCr15, 20CrMnTi and the like. Although the alloy steel has long time for practical application and a mature material system, the alloy steel has large thermal expansion coefficient, poor dimensional stability, poor low-temperature resistance, large density, low specific strength and generally has lower service life than expected due to factors such as atomic oxygen, irradiation and the like in space. Thereby leading to premature failure of the space activity components, causing mechanical failure of the spacecraft and affecting the service life of the spacecraft. Currently, the primary alternative material used is titanium alloy with alloy designation TC 4. However, the TC4 titanium alloy matrix has low hardness (HRC30), low strength (900MPa), and unsatisfactory wear resistance and dimensional stability. Therefore, research on a new alloy system as a substitute material for alloy steel is urgently needed, thereby promoting the development of the field of aerospace materials.

Disclosure of Invention

In order to overcome the defects of a space activity construction material in the fields of aerospace and the like, the invention provides a novel high-performance zirconium-titanium binary alloy and a preparation method thereof. The invention takes a zirconium-based alloy system as a research object (basic material), and prepares the novel high-performance zirconium-titanium binary alloy by adding titanium and using a set of process method.

The technical scheme adopted by the invention is as follows:

the zirconium-titanium binary alloy comprises the following components in percentage by atom: 55-65% of zirconium and 45-35% of titanium; the tensile strength of the zirconium-titanium binary alloy can reach 1052-1234 MPa, the elongation can reach more than 7%, and compared with 9Cr18 steel and TC4 titanium alloy, the zirconium-titanium binary alloy has better comprehensive mechanical properties, low density and good corrosion resistance.

A method for preparing a zirconium titanium binary alloy comprises the following steps:

(1) preparation of raw materials: polishing the surfaces of 55-65% of zirconium and 45-35% of titanium by using sand paper, cleaning by using ultrasonic waves, and finally quickly drying by using a blower.

(2) Ingot casting: putting the raw materials which are uniformly mixed according to the proportion into a non-consumable smelting furnace for smelting, introducing argon into the smelting furnace for protection, and turning over an alloy ingot for at least 5 times in the smelting process to ensure uniform smelting; the smelting time is 5-10 minutes after each overturning.

(3) Homogenizing and annealing: and (3) placing the alloy ingot into a tube furnace, heating to 900-1100 ℃ in the argon protective atmosphere, preserving the heat for 4-5 hours, and then cooling along with the furnace, so as to further homogenize the components of the alloy ingot.

(4) Hot working deformation: and (3) placing the alloy ingot subjected to the homogenization treatment into a box-type resistance furnace, heating the box-type resistance furnace to the temperature of 700-. And then rapidly transferring the alloy ingot to a double-roller mill for multi-pass rolling deformation: and after the first rolling is finished, the alloy ingot is placed back to the box type resistance furnace for heat preservation for 3-5 minutes, then the second rolling deformation is rapidly carried out, and the process is circulated until the reduction deformation of the alloy ingot reaches 70%. And after the last rolling, placing the alloy plate in the atmosphere and naturally cooling to room temperature. And (4) performing procedures such as peeling, acid washing, surface polishing and the like on the cooled alloy plate, and cleaning to obtain the zirconium-titanium binary alloy.

Compared with the traditional alloy, the zirconium-titanium binary alloy prepared by the invention has the following advantages:

1. the zirconium-titanium binary alloy obtained by the invention has higher strength and plasticity, and can be used as an aviation structural member material.

2. The zirconium-titanium binary alloy obtained by the invention has the advantages of low density, good corrosion resistance, radiation resistance and other excellent mechanical and physical and chemical properties.

3. Compared with the traditional alloy, the zirconium-titanium binary alloy obtained by the invention has simple preparation process and easy operation.

The tensile strength of the zirconium-titanium alloy obtained by the method can reach more than 1200MPa, the elongation can reach more than 7%, and the zirconium-titanium alloy has better comprehensive mechanical properties compared with 9Cr18 steel and TC4 titanium alloy. Meanwhile, the zirconium alloy has the advantages of low density, good corrosion resistance and the like, and the application range of the zirconium alloy in the aerospace industry is expanded.

Detailed Description

The present invention is described in detail below by way of examples, which are intended to be illustrative only and not to be construed as limiting the scope of the invention, which is to be given the full breadth of the appended claims and any and all insubstantial modifications and variations thereof which are within the scope of the appended claims.