CN-121976044-A - Titanium-aluminum alloy prepared by magnesium-aluminum reduction tetrachloride one-step method and preparation method thereof

Abstract

The invention relates to the technical field of metal materials, in particular to a titanium-aluminum alloy prepared by a magnesium-aluminum reduction tetrachloride one-step method and a preparation method thereof. The preparation method comprises the steps of preparing magnesium and aluminum into molten magnesium-aluminum melt under an argon environment, adding metal chloride into the magnesium-aluminum melt under stable pressure and low-frequency electromagnetic stirring by controlling reaction temperature and feeding rate, preparing a sponge titanium-aluminum alloy mixture through thermal reduction reaction until the feeding is finished, removing unreacted reducing agent magnesium and byproduct magnesium chloride from the sponge titanium-aluminum alloy mixture through vacuum distillation, and then charging argon and discharging for natural cooling to obtain the pure multielement titanium-aluminum alloy. The invention not only solves the problems of poor uniformity of alloy element distribution and forced complicating process flow, but also can realize uniform distribution of micron-sized elements in the aspect of component control.

Inventors

• YANG ZHANXIN
• WANG JUNBO
• ZHOU KEXIN
• Song Laibao
• MOU WANGZHONG
• LIU TIE
• WANG QIANG

Assignees

• 东北大学
• 宝钛华神钛业有限公司

Dates

Publication Date

20260505

Application Date

20260401

Claims (7)

1. 1. A preparation method for preparing a titanium-aluminum alloy by a magnesium-aluminum reduction tetrachloride one-step method is characterized by comprising the following steps of: S1, preparing magnesium and aluminum into molten magnesium-aluminum melt under an argon environment; s2, adding metal chloride into the magnesium-aluminum melt by controlling the reaction temperature and the feeding rate under the condition of stable pressure and low-frequency electromagnetic stirring, and preparing a sponge titanium-aluminum alloy mixture through thermal reduction reaction until the feeding is finished; and S3, removing unreacted reducing agent magnesium and byproduct magnesium chloride from the sponge titanium-aluminum alloy mixture through vacuum distillation, and then charging argon, discharging and naturally cooling to obtain the pure multi-element titanium-aluminum alloy.
2. 2. The method for preparing the titanium-aluminum alloy by the one-step method for reducing magnesium-aluminum tetrachloride according to claim 1, wherein the magnesium input in the step S1 is at least 1.2 times of the theoretical amount required by reducing titanium tetrachloride and an alloying element chloride to pure metal by magnesium, the aluminum input is added according to the required mass percentage of aluminum element in the product multi-element titanium-aluminum alloy, and the requirement that the aluminum in the product multi-element titanium-aluminum alloy accounts for 2-63% of the total mass percentage is met.
3. 3. The method for preparing the titanium-aluminum alloy by the one-step method for reducing the magnesium-aluminum tetrachloride according to claim 1, wherein the addition amount of the titanium tetrachloride and the chloride of the alloy element in the step S2 is calculated according to the mass percentage of each element required in the product multi-element titanium-aluminum alloy, and the mass percentage of the chloride of the corresponding element is converted.
4. 4. The method for preparing the titanium-aluminum alloy by the one-step method for reducing magnesium aluminum tetrachloride according to claim 1, wherein the stable pressure in the step S2 is 5-25kPa, the working frequency of low-frequency electromagnetic stirring is 0.5-20Hz, the output current is 300-415A, the reaction temperature is controlled to be 600-700 ℃, and the feeding rate is 2-10kg/h.
5. 5. The method for preparing a titanium-aluminum alloy by a one-step method for reducing magnesium-aluminum tetrachloride according to claim 1, wherein the vacuum distillation conditions in step S3 are controlled such that the vacuum degree is 1 x 10 -2 Pa to 5 x 10 -2 Pa and the temperature in the reactor is raised to 900-1000 ℃ after distillation.
6. 6. The method for preparing the titanium-aluminum alloy by the one-step method for reducing the magnesium-aluminum tetrachloride according to claim 1, wherein positive pressure in the furnace is maintained in the process of discharging and naturally cooling in the step S3.
7. 7. A titanium-aluminum alloy, characterized in that it is produced by the one-step production method of magnesium-aluminum reduction tetrachloride according to any one of claims 1 to 6.

Description

Titanium-aluminum alloy prepared by magnesium-aluminum reduction tetrachloride one-step method and preparation method thereof Technical Field The invention relates to the technical field of metal materials, in particular to a preparation method for preparing a titanium-aluminum alloy by a magnesium-aluminum reduction tetrachloride one-step method and the titanium-aluminum alloy prepared by the method. Background The titanium-aluminum alloy has high strength, corrosion resistance and low density of aluminum and good heat conductivity, and has wide application prospect in high-end fields such as aerospace, automobile manufacturing, medical appliances and the like. Along with the continuous rising of the industrial demand for high-performance lightweight materials, the preparation process of the titanium-aluminum alloy becomes a research hot spot. Currently, the mainstream preparation methods of titanium-aluminum alloys include vacuum arc melting, electron beam melting, powder metallurgy, and the like. The vacuum arc melting method needs to be melted for multiple times to ensure the uniformity of components, has high energy consumption and long production period, is difficult to accurately control the content of trace elements in the alloy, can realize higher purification effect, has high equipment investment and high operation cost, is unfavorable for large-scale production, and has the advantages of reducing the segregation degree of the alloy by the powder metallurgy method, easily introducing impurities in the powder preparation and sintering process, having complex working procedures and leading the production cost to be high. In addition, the titanium-aluminum alloy is prepared by adopting a stepwise reduction mode in the traditional process, namely, firstly reducing TiCl 4 by Mg to obtain titanium sponge, then crushing the titanium sponge, adding aluminum and other alloy elements to mix according to a proportion, and then pressing the mixed materials to an electrode and smelting to finally obtain the titanium-aluminum alloy. The step-by-step process is complex in flow, raw material loss can be caused by transfer and secondary treatment of intermediate products, the utilization rate is reduced, meanwhile, the possibility of segregation and local structural defects of the titanium-aluminum alloy is increased, and the performance stability of a final alloy product is difficult to ensure. In order to solve the defects of the process, chinese patent CN115011829A discloses a preparation method of a titanium-aluminum alloy, the titanium-aluminum alloy and application thereof, but the prepared titanium-aluminum alloy is a binary titanium-aluminum alloy which has no practicability, room temperature plasticity, high temperature oxidation resistance and comprehensive mechanical properties, and cannot meet the requirements of application environment, other metal elements with functions, such as a third or fourth alloy element, for example, chromium (Cr), niobium (Nb), manganese (Mn), molybdenum (Mo) and the like, are generally introduced in the preparation process, so that a ternary or quaternary titanium-aluminum alloy system with more optimized components and structures is formed, in addition, the method is only suitable for small-scale tests, and when the alloy is produced in a large furnace, the density of Mg and Al is inconsistent, so that the Mg and Al are layered, and finally, the uniformity of the components of the whole alloy lump is extremely poor. Nevertheless, in the existing various preparation methods, a series of outstanding problems and challenges still exist in the way of introducing alloy elements, and the stable and efficient preparation of the high-performance multi-element titanium-aluminum alloy is severely restricted. When adding alloying elements such as Cr and Mn, a method of directly adding pure metal or a prefabricated intermediate alloy is often adopted. Because the alloy element has obvious differences with titanium and aluminum matrixes in melting point, density, reactivity and diffusion rate, the macrosegregation or microsegregation of components in the melt solidification process is extremely easy to cause, and the atomic-level uniform distribution of the alloy element in the matrixes is difficult to realize. Such non-uniformity may induce local enrichment of the detrimental brittle phase, which not only may not be effective in its plasticizing and strengthening effects, but may instead be a source of cracks, compromising the uniformity and performance reliability of the alloy. Meanwhile, the addition of alloy elements often depends on the subsequent smelting process. This not only makes the original lengthy process flow more complex, but also requires a higher degree of superheat or longer holding time to promote dissolution when high melting point elements (such as Nb, mo) are added, significantly increasing energy consumption and production cycle. If the solid metal form is adopte