CN-122013015-A - High-strength alloy material and preparation method thereof

Abstract

The invention belongs to the technical field of alloys, and particularly relates to a high-strength alloy material and a preparation method thereof. The alloy material comprises, by mass, 6-7% of Al, 4.5-5.5% of Ca, 0.3-0.6% of Mn, 0.8-1.3% of Sr, 0.8-1.3% of rare earth elements, gd and Nd, and the balance of Mg and unavoidable impurities. The small amount of Mn and Sr provides fine-grain strengthening and good plastic foundation for the alloy, and the Gd/Nd provides strong precipitation strengthening effect through solid solution strengthening and precipitation of a large amount of nano phases in crystal/grain boundary. Meanwhile, a layer of multi-element, multi-layer and high-compactness composite oxide film formed by various oxides can be formed on the surface of the alloy by the composite addition of the composite oxide film, and can be used as an extremely effective barrier to raise the ignition point of the alloy to a very high level, so that an excellent flame-retardant effect is realized.

Inventors

• BI JINGYING
• Zhao Nianna
• LI YUNFENG
• LV LILI
• Dou Rongwei
• ZHANG YUKUN
• WU YUJUAN

Assignees

• 山东宏泰科技有限公司

Dates

Publication Date

20260512

Application Date

20260414

Claims (10)

1. 1. The high-strength alloy material is characterized by comprising the following components in percentage by mass: 6-7% of Al, 4.5-5.5% of Ca, 0.3-0.6% of Mn, 0.8-1.3% of Sr, 0.8-1.3% of rare earth elements, and the balance of Mg and unavoidable impurities, wherein the rare earth elements consist of Gd and Nd with the mass ratio of 1 (0.2-0.4).
2. 2. The high-strength alloy material according to claim 1, which comprises, by mass, 6.2 to 6.8% of Al, 4.6 to 5.3% of Ca, 0.3 to 0.5% of Mn, 0.9 to 1.2% of Sr, 0.9 to 1.2% of rare earth elements consisting of Gd and Nd in a mass ratio of 1 (0.2 to 0.4), and the balance of Mg and unavoidable impurities.
3. 3. A high strength alloy material according to claim 1, wherein the rare earth element consists of Gd and Nd in a mass ratio of 1:0.3.
4. 4. A method of producing a high strength alloy material according to any one of claims 1 to 3, comprising the steps of: S1, preparing raw materials according to the proportion of each component, namely pure Mg, pure Al, mg-30Ca intermediate alloy, mg-20Sr intermediate alloy, mg-6Mn intermediate alloy, mg-20Gd intermediate alloy and Mg-30Nd intermediate alloy, and preheating; s2, placing the preheated pure Mg and pure Al into a container, then placing the container into a device for heating to 700-750 ℃, and heating and preserving heat under a protective atmosphere until the pure Mg and the pure Al are melted to obtain a melt; S3, adding the preheated Mg-30Ca intermediate alloy, the preheated Mg-20Sr intermediate alloy, the preheated Mg-6Mn intermediate alloy, the preheated Mg-20Gd intermediate alloy and the preheated Mg-30Nd intermediate alloy, carrying out heat preservation, stirring after the intermediate alloy is melted, removing scum, and continuing to carry out heat preservation; S4, taking out the container, cooling to room temperature in a protective atmosphere, preparing an alloy cast ingot, performing heat treatment, and taking out for quenching; s5, extruding and deforming to obtain the high-strength alloy material.
5. 5. The method of producing a high strength alloy material according to claim 4, wherein the preheating temperature in step S1 is 200 to 300 ℃.
6. 6. The method of claim 4, wherein the preheating time in step S1 is 15-25min.
7. 7. The method for producing a high-strength alloy material according to claim 4, wherein said step S3 is performed for a holding time of 10 to 25 minutes.
8. 8. The method for producing a high-strength alloy material according to claim 4, wherein said step S3 is continued for a period of 10 to 15 minutes.
9. 9. The method of manufacturing a high strength alloy material according to claim 4, wherein the cooling in step S4 is water cooling.
10. 10. The method for preparing a high strength alloy material according to claim 4, wherein the specific heat treatment process in step S4 is 380-430 ℃ for 10-15 hours.

Description

High-strength alloy material and preparation method thereof Technical Field The invention belongs to the technical field of alloys, and particularly relates to a high-strength alloy material and a preparation method thereof. Background The weight reduction of materials is an important direction in the development of new materials. As a green and environment-friendly metal structural material-magnesium alloy, the magnesium alloy has the advantages of high specific strength, specific rigidity, good shock absorption, thermal conductivity and the like, and gradually becomes a substitute for structural materials such as steel, iron, aluminum, plastics and the like, and is widely paid attention to the material world of various countries. For over a century, the material sciences have been working on developing industrial new magnesium alloys by alloying and heat treatment techniques, and significant progress has been made. Several mature magnesium alloy series such as Mg-Al, mg-Al-Zn, mg-Zn-Zr, mg-RE-Zr and the like are formed by 70 years, and the magnesium alloy series has precious application value and wide application prospect in the industries such as aerospace, automobiles, aviation and the like. When the rapid development of the lower communication industry brings high requirements on the thin wall light weight of electronic equipment, the advantages of low density, high strength and the like of the magnesium alloy win a good opportunity for the development of the magnesium alloy. However, magnesium alloy is also subjected to a bottleneck in the process of being widely focused and applied, namely, magnesium has relatively active chemical properties, and magnesium alloy is extremely easy to oxidize and burn in the preparation and processing processes, so that the difficulty in producing and preparing the magnesium alloy is relatively high, the production technology of the magnesium alloy is not mature and perfect, particularly, the forming technology of the magnesium alloy has a large development space, and the poor heat resistance of the magnesium alloy also becomes a barrier to wide application of the magnesium alloy. The hardness and strength of pure magnesium are very low, so that the application of the pure magnesium in the engineering field is limited, but if some metal elements such as aluminum, zinc, alkaline earth elements, rare earth elements and the like are added into the magnesium, the magnesium alloy with light weight and high performance is obtained through alloying, so that the pure magnesium is widely applied to the fields of engineering technology, aerospace and the like. The basic principle of magnesium alloying is that solid solution strengthening and second phase strengthening are generated through the interaction between the added alloying element and the magnesium matrix or the alloying element, so that the room temperature mechanical property, corrosion resistance, high temperature property and the like of the magnesium alloy are improved. Magnesium alloys are widely used in many industries due to their low density, high specific strength, good electromagnetic shielding properties, and the like. Magnesium has been used as an alloying element added to aluminum alloys in the past, and currently, the successful use of die-cast magnesium alloys has led to more attention from magnesium alloys, which is a hot spot for development and research. Among them, the electronic industry is one of the most rapidly developing industries in the world today, and is also an emerging field of magnesium alloy application. The demand of the electronic industry for magnesium alloy is mainly due to the advantages of light weight, high specific stiffness, good thin wall casting performance and the like, and in addition, the characteristics of good thermal conductivity, damping performance, electromagnetic shielding property, easy recycling and the like are also an important reason why the electronic industry favors magnesium alloy. The national defense and aerospace products have extremely high requirements on the weight reduction of the material and the performance of the material, and the magnesium alloy is widely applied due to the light weight. Methods for improving the performance of magnesium alloys have found many uses in aerospace and aviation, such as helicopter rotor attachments, aircraft gear boxes and landing wheels. With the continuous perfection of magnesium and its alloy manufacturing technology, the application of magnesium alloy in armor part structural members and tanks, missile empennages, shells and the like will be greatly increased. In addition, magnesium alloys are widely used in the field of radio communication because of their excellent anti-interference performance with electrical signals. Among them, mg-Al-Ca magnesium alloys are most widely used. However, the existing Mg-Al-Ca magnesium alloy has lower mechanical property and poor flame retardant property, and limits further popula