CN-117026041-B - Mg-Zn-Sc-Mn magnesium alloy material and preparation method thereof

Abstract

The invention belongs to the technical field of magnesium alloy materials, and discloses a novel Mg-Zn-Sc-Mn magnesium alloy material which comprises the following raw materials in percentage by mass: compared with the prior art, the invention forms an Mg2Zn precipitated phase with Mg by adding Zn, thereby effectively strengthening alloy, purifying melt, retarding flame, refining crystal grains, reducing the hot cracking tendency of Mg-Zn alloy during casting and extrusion, improving the corrosion resistance of magnesium alloy, and further regulating and controlling recrystallization structure by adding Mn. The alloy has excellent degradation performance and controllable mechanical property, and can be applied to the biomedical field.

Inventors

• She jia
• WANG YONG
• TANG AITAO
• PAN FUSHENG
• TONG YONGXIANG
• WU XIONG
• WANG SENWEI
• XIAO HUI
• LUO TAO
• TONG JUN
• OUYANG SIHUI
• CHEN XIANHUA
• QIAO LIYING

Assignees

• 浙江镁格尼亚新材料有限公司

Dates

Publication Date

20260512

Application Date

20230816

Claims (6)

1. 1. The preparation method of the Mg-Zn-Sc-Mn magnesium alloy material is characterized by comprising the following steps: Smelting ingot casting, namely weighing each raw material component, smelting Mg at 720-740 ℃ in inert protective atmosphere, adding the rest preheated raw material components after smelting, and deslagging, pouring and cooling after complete smelting; extruding, namely extruding and forming the magnesium alloy cast ingot after cooling and forming under the condition that the extrusion ratio is 10:1-100:1 and the extrusion temperature is 300-400 ℃; Before the extrusion step, performing solution treatment on the magnesium alloy cast ingot after cooling forming at the temperature of 350-420 ℃; wherein the Mg-Zn-Sc-Mn magnesium alloy material comprises, by mass, 2.00-6.00% of Zn, 1-2.00% of Sc, 0.01-1.00% of Mn, and the balance of magnesium and unavoidable impurities; the tensile strength of the Mg-Zn-Sc-Mn magnesium alloy material reaches more than 310MPa at room temperature, the yield strength reaches more than 200MPa, and the elongation percentage reaches 20%.
2. 2. The method for preparing a Mg-Zn-Sc-Mn magnesium alloy material according to claim 1, wherein in the step of smelting and casting, all raw material components are completely melted and stirred, and floating residues are removed.
3. 3. The method for preparing a Mg-Zn-Sc-Mn magnesium alloy material according to claim 1, wherein the step of smelting and casting is performed for 15-20min before casting.
4. 4. The method for preparing Mg-Zn-Sc-Mn magnesium alloy material according to claim 1, wherein in the step of smelting and casting ingot, water cooling is adopted.
5. 5. The method for preparing a Mg-Zn-Sc-Mn magnesium alloy material according to claim 1, wherein the inert protective atmosphere is a mixed gas of CO 2 and SF 6 , and the volume ratio of CO 2 to SF 6 in the mixed gas is 99-98:1.
6. 6. The method for producing a Mg-Zn-Sc-Mn magnesium alloy material according to any one of claims 2 to 5, wherein the raw material composition has a Mg purity of 99.99% or more, a Zn purity of 99.99% or more, sc is added in the form of 8 to 10% of a Mg-Sc master alloy, mn is added in the form of 2 to 3% of a Mg-Mn master alloy, and both the Mg-Sc master alloy and the Mg-Mn master alloy have a purity of 99.9% or more.

Description

Mg-Zn-Sc-Mn magnesium alloy material and preparation method thereof Technical Field The invention relates to the technical field of magnesium alloy materials, in particular to a Mg-Zn-Sc-Mn magnesium alloy material and a preparation method thereof. Background With the increasing severity of the aging population in China, the prevalence of orthopaedics continues to increase, and bone tissue has become the second largest transplanted tissue next to blood. Compared with the traditional metal implantation materials (titanium alloy, stainless steel and the like), the magnesium alloy has better biocompatibility and degradability, and has become the most potential new generation of degradable orthopedic implantation materials. However, the difficulty in balancing toughness, degradation controllability and biocompatibility is a major bottleneck problem restricting the clinical application. The solid solubility of Zn in magnesium alloy is 6.2%, and the mechanical property of Mg can be greatly improved through solid solution or aging precipitation strengthening. Meanwhile, the corrosion potential of Mg can be improved by adding Zn, the effect of stabilizing the Mg corrosion product film can be achieved, and the corrosion resistance of Mg can be improved. Sc has larger solid solubility in Mg, the atomic radius in rare earth element is closest to that of Mg, and the addition of Sc element in Mg-Zn based alloy can obtain high strength and high corrosion resistance, and simultaneously can purify melt, flame retardant, refine crystal grains, reduce the hot cracking tendency of Mg-Zn alloy during casting and extrusion, and finally obtain magnesium alloy with good comprehensive performance. Mn is used as a common alloy element in Mg-Zn based magnesium alloy, and can obviously fine grains, regulate and control recrystallization structure and improve the strength and toughness of the alloy. The Zn, mn and other elements as alloy materials have good biocompatibility and osteoinductive characteristics, can well reduce degradation rate, participate in various physiological activities, have good safety, and are satisfactory alloy materials. Among the rare earth elements, almost all rare earth elements are phagocytized by macrophages and enriched in the liver and other parts when being degraded in vivo, and cannot be metabolized out of the body, and rare earth Sc element is one of the elements which can not be discharged out of the body through body fluid and has excellent biological safety. The patent document with the application number of CN202210643515.8 discloses a method for improving the comprehensive performance of a biodegradable Mg-Zn-Sc-Zr alloy, wherein the biodegradable Mg-Zn-Sc-Zr alloy comprises, by mass, 1.5% -2.5% of Zn, 1.0% or less of Sc, 0.1% -0.25% of Zr, and the balance of magnesium and unavoidable impurities. The biodegradable Mg-Zn-Sc-Zr alloy is added with a small amount of Sc elements besides common elements such as Zn and Zr, has good biocompatibility and greatly improves mechanical properties, but the corrosion resistance of the biodegradable Mg-Zn-Sc-Zr alloy is still not high, and Zr is not degradable. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide an Mg-Zn-Sc-Mn magnesium alloy material so as to solve the problems that the corrosion resistance of the alloy is still low and undegradable components exist in the prior art. The Mg-Zn-Sc-Mn magnesium alloy material comprises, by mass, 2.00-6.00% of Zn, 0.01-2.00% of Sc, 0.01-1.00% of Mn, and the balance of magnesium and unavoidable impurities. The invention also adopts the following technical scheme that the preparation method of the Mg-Zn-Sc-Mn magnesium alloy material comprises the following steps: Smelting ingot casting, namely weighing each raw material component, smelting Mg at 720-740 ℃ in inert protective atmosphere, adding the rest preheated raw material components after smelting, and deslagging, pouring and cooling after complete smelting; Extruding, namely extruding and forming the magnesium alloy cast ingot after cooling and forming under the condition that the extrusion ratio is 10:1-100:1 and the extrusion temperature is 300-400 ℃. Further, before the extrusion step, the magnesium alloy cast ingot after cooling molding is subjected to solution treatment at the temperature of 350-420 ℃. Further, in the step of smelting and ingot casting, the floating residues are removed after all raw material components are completely melted and stirred. Further, in the step of smelting and casting ingot, standing is carried out for 15-20min before casting. In the step of smelting and casting, water cooling is adopted specifically. Further, the inert protective atmosphere is a mixed gas of CO 2 and SF 6, and the volume ratio of CO 2 to SF 6 in the mixed gas is 99-98:1. Further, the purity of Mg in the raw material components is more than 99.99%, the purity of Zn is more than 99.99%, sc is added in the fo