CN-121989516-A - Interface reinforced magnesium alloy based on LPSO phase in-situ generation and preparation method and application thereof

Abstract

The invention belongs to the technical field of metal composite material preparation, and relates to an interface reinforced magnesium alloy based on LPSO (low-pressure-sensitive adhesive) phase in-situ generation, a preparation method and application thereof, wherein the interface reinforced magnesium alloy based on the LPSO phase in-situ generation comprises a GW103K magnesium alloy plate and an AZ31 magnesium alloy plate which are sequentially laminated and combined, and a strip-shaped structure generated by a 14H-LPSO phase in-situ is arranged at one side of the GW103K magnesium alloy plate in an interface area of the GW103K magnesium alloy plate and the AZ31 magnesium alloy plate. According to the invention, the controllable construction of the LPSO strengthening phase in a preset area of a heterogeneous interface is realized by combining the interface diffusion and the thermo-mechanical deformation of the heterogeneous material, and the obtained interface strengthening magnesium alloy has excellent comprehensive mechanical properties.

Inventors

• LI LEI
• PAI JUNJUN
• ZHU XIAODONG
• ZHOU ZHONGCHEN
• FENG MAN
• HAN HONGYONG
• LI ZIFU
• DING HAORAN
• SUN YAOWU
• ZHANG JUNLIU

Assignees

• 滨州魏桥国科高等技术研究院

Dates

Publication Date

20260508

Application Date

20260226

Claims (10)

1. 1. The interface reinforced magnesium alloy based on LPSO phase in-situ generation is characterized by comprising a GW103K magnesium alloy plate and an AZ31 magnesium alloy plate which are sequentially laminated and combined, wherein a band-shaped structure generated by 14H-LPSO phase in-situ is arranged on one side of the GW103K magnesium alloy plate in an interface area of the GW103K magnesium alloy plate and the AZ31 magnesium alloy plate.
2. 2. The LPSO phase in-situ generated interface-strengthened magnesium alloy of claim 1, wherein the ribbon structure has a width of 4-8 μιη.
3. 3. The LPSO phase in-situ generated interface-strengthened magnesium alloy according to claim 1 or 2, wherein the 14H-LPSO phase is distributed in a long stripe shape with an average length dimension of 5-30 μm and an average thickness dimension of 5-100nm.
4. 4. A method for preparing an interface-strengthened magnesium alloy based on LPSO phase in-situ generation according to any one of claims 1-3, comprising the steps of: (1) Pretreating the surfaces to be connected of the GW103K magnesium alloy plate and the AZ31 magnesium alloy plate, stacking, and then performing vacuum diffusion connection, wherein a continuous Al 2 (Gd, Y) intermetallic compound layer is formed on one side of the AZ31 magnesium alloy plate at the interface to obtain a diffusion connection composite plate; (2) And (3) carrying out multi-pass hot rolling on the diffusion-connected composite plate obtained in the step (1), and carrying out in-situ precipitation of a 14H-LPSO phase on one side of the GW103K magnesium alloy plate at the interface to obtain the interface reinforced magnesium alloy based on in-situ generation of the LPSO phase.
5. 5. The method according to claim 4, wherein the pretreatment in step (1) comprises mechanical polishing, polishing and washing performed sequentially; Preferably, the cleaning comprises ion sputter cleaning or ultrasonic cleaning.
6. 6. The method according to claim 4 or 5, wherein the vacuum diffusion bonding in step (1) is performed at a temperature of 400-530 ℃ for a time of 1-5 hours; preferably, the pressure of the vacuum diffusion connection in the step (1) is 5-20MPa; Preferably, the vacuum degree of the vacuum diffusion connection in the step (1) is more than or equal to 5 multiplied by 10 -3 Pa.
7. 7. The method according to any one of claims 4 to 6, wherein the temperature of the diffusion-bonded composite sheet is controlled to be maintained at the temperature of vacuum diffusion bonding before the multi-pass hot rolling in step (2); Preferably, the temperature of the multi-pass hot rolling in step (2) is 350-500 ℃, preferably 450 ℃.
8. 8. The method according to any one of claims 4 to 7, wherein the total deformation of the multi-pass hot rolling in step (2) is 30 to 90%, preferably 60%; Preferably, the heat preservation is carried out for 5-20min at the hot rolling temperature among the multiple hot rolling passes in the step (2).
9. 9. An aerospace vehicle comprising the LPSO phase in-situ generated interface-strengthened magnesium alloy of any one of claims 1-3.
10. 10. A vehicle comprising the LPSO phase in-situ generated interface-strengthened magnesium alloy of any one of claims 1-3.

Description

Interface reinforced magnesium alloy based on LPSO phase in-situ generation and preparation method and application thereof Technical Field The invention belongs to the technical field of metal composite material preparation, and relates to an interface reinforced magnesium alloy based on LPSO phase in-situ generation, and a preparation method and application thereof. Background The long-period stacking ordered (Long Period Stacking Ordered, LPSO) structural phase is recognized as one of the most potential key strengthening phases because of its ability to significantly improve the strength, plasticity and heat resistance of magnesium alloys at the same time. The traditional technical path for introducing the LPSO phase into the magnesium alloy mainly depends on an integral alloying process, namely, magnesium-rare earth-zinc (Mg-RE-Zn) series massive alloy with strictly homogenized component proportion is prepared by smelting, and then the LPSO phase is promoted to be formed by long-time high-temperature homogenization heat treatment. In practical engineering applications and component manufacturing, the introduction of LPSO phases into magnesium alloys by a monolithic alloying process has the inherent disadvantage that the first and second spatial distributions are not controllable. LPSO phases are randomly and dispersedly distributed in an as-cast structure, local strengthening cannot be implemented for a high-stress concentration area, so that the material performance potential is not utilized efficiently, the morphology, the size and the type of the second phase are difficult to control, the process window is narrow, the consumption of third and fourth rare earth is large, and the cost is high. Therefore, a new method capable of precisely controlling the position, morphology and structure of the LPSO phase is developed, and the method has important significance for promoting the design and application of high-performance magnesium alloy. The diffusion connection technology can realize the metallurgical bonding of different materials, and forms a diffusion reaction layer with obvious component gradient and unique structure through element interdiffusion in an interface area, which is equivalent to constructing a precursor area rich in specific alloy elements in situ at a specific position of a matrix. However, the existing research mainly focuses on realizing material bonding by using diffusion connection, and no systematic technical research exists at present on how to design and regulate an interface diffusion reaction layer as a precursor and directionally convert the interface diffusion reaction layer into a high-performance LPSO strengthening region with a predetermined morphology and structure through a controllable subsequent process chain. In view of the foregoing, there is a need for a solution that can controllably construct LPSO phases in an interface region of a magnesium alloy material. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide an interface reinforced magnesium alloy based on LPSO phase in-situ generation, and a preparation method and application thereof, so that the controllable construction of the LPSO reinforced phase in a heterogeneous interface preset area is realized, and the obtained material has high interface bonding strength and excellent comprehensive mechanical property. In order to achieve the aim of the invention, the invention adopts the following technical scheme: In a first aspect, the invention provides an interface reinforced magnesium alloy based on LPSO phase in-situ generation, which comprises a GW103K magnesium alloy plate and an AZ31 magnesium alloy plate which are sequentially laminated and combined, wherein in an interface area of the GW103K magnesium alloy plate and the AZ31 magnesium alloy plate, one side of the GW103K magnesium alloy plate is provided with a strip-shaped structure generated by 14H-LPSO phase in-situ. The interface reinforced magnesium alloy based on LPSO phase in-situ generation provided by the invention breaks through the traditional mode that LPSO phases are randomly distributed in a matrix, utilizes a heterogeneous interface as a reaction place, realizes in-situ selective construction of the LPSO reinforced phase in a specific interface area of a layered material, realizes 'on-demand reinforcement', and has the tensile strength of 265MPa as high as possible, the elongation of 14% as high as possible after breaking and excellent comprehensive mechanical properties. Preferably, the width of the ribbon structure is 4-8 μm, for example, 4 μm, 5 μm, 6 μm, 7 μm or 8 μm, but not limited to the recited values, and other values not recited in the range of values are equally applicable. The width of the strip structure needs to be controlled within a certain range, the width is too small, so that good reinforcement can not be obtained near an interface, the comprehensive mechanical property of