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CN-122013014-A - Novel high-strength Mg-Al-Y-Sn alloy based on 3D printing technology and preparation process thereof

CN122013014ACN 122013014 ACN122013014 ACN 122013014ACN-122013014-A

Abstract

The invention relates to the technical field of nonferrous metal design and intelligent manufacturing and processing, in particular to a novel high-strength Mg-Al-Y-Sn alloy based on a 3D printing technology and a preparation process thereof. The Mg-Al-Y-Sn alloy comprises, by weight, 3.0-9.0wt% of Al, 0.5-2.0wt% of Y, 0.5-2.0wt% of Sn, and the balance of Mg and unavoidable impurity elements. The invention designs a customized, light-weighted and high-strength Mg-Al-Y-Sn alloy and a preparation process thereof, which can overcome the difficulty that the current light-weighted magnesium alloy is difficult to print by adopting a selective laser melting technology. The performance optimization is realized by forming the second phase of Mg 2 Sn、Al 2 Y and the strengthening mode of laser selective melting rapid solidification refinement crystal grains, the synergistic strengthening effect of solid solution strengthening, fine grain strengthening and second phase strengthening is fully exerted, and the novel high-strength printable Mg-Al-Y-Sn alloy is designed.

Inventors

  • LI WANDONG
  • DING CHAOQUN
  • ZUO MINGWEI
  • LUO XINYU
  • SUN YU
  • SONG YUQI
  • LI JIAXIN
  • YANG RUICHEN
  • GUO SHUMENG

Assignees

  • 河北石油职业技术大学

Dates

Publication Date
20260512
Application Date
20260225

Claims (9)

  1. 1. The novel high-strength Mg-Al-Y-Sn alloy based on the 3D printing technology comprises, by weight, 3.0-9.0wt% of Al, 0.5-2.0wt% of Y, 0.5-2.0wt% of Sn, and the balance of Mg and unavoidable impurity elements.
  2. 2. The novel high-strength Mg-Al-Y-Sn alloy according to claim 1, wherein the printing raw material is a pure Mg powder, mg-25Y alloy powder, pure Sn powder, and pure Al powder having a diameter of 20 to 50 μm.
  3. 3. A novel high-strength Mg-Al-Y-Sn alloy of claim 1 or 2, prepared by a selective laser melting process comprising the steps of: And (3) independently drying the pure Mg powder, the Mg-25Y intermediate alloy powder, the pure Sn powder and the pure Al powder according to the target mass percentage, specifically drying the powder in a vacuum drying oven at 70 ℃ for 3 hours, and further carrying out powder mixing treatment, thereby obtaining the target alloy powder for selective laser melting.
  4. 4. A selective laser melting powder prepared according to claim 3, prepared for selective laser melting, comprising the steps of: (1) Carrying out pre-melting drying treatment on alloy powder for selective laser melting, and simultaneously preheating a printed substrate; (2) Powder spraying and selective laser melting are carried out under the environment of inert atmosphere, and the selective laser melting is carried out when the oxygen content (volume fraction) is reduced to below 120 multiplied by 10 -6 .
  5. 5. The selective laser melting preparation of claim 4; preferably, the substrate is preheated to a temperature of 200 ℃; Preferably, the inert gas is argon.
  6. 6. The preparation method according to claim 4 and 5, wherein the technological parameters of the selective laser melting are specifically set as follows, the laser power is 100-150 mm/s, the printing power is 300-600W, the powder layer thickness is 10-30 μm, and the scanning interval is 100-200 μm.
  7. 7. According to the processing parameters set in claim 6, the selective laser melting adopts a band-shaped scanning strategy, and the printing alloy forming part is obtained by scanning layer by layer.
  8. 8. Alloy prepared according to claim 7, subjected to suitable heat treatment, in particular solution treatment and element homogenization treatment, carried out at 480 ℃ for 5 h.
  9. 9. Product customization applications of the alloy product prepared according to claim 8 in the automotive, military and aerospace fields.

Description

Novel high-strength Mg-Al-Y-Sn alloy based on 3D printing technology and preparation process thereof Technical Field The invention relates to the technical field of nonferrous metal design and intelligent manufacturing and processing, in particular to a novel high-strength Mg-Al-Y-Sn alloy based on a 3D printing technology and a preparation process thereof. Background The magnesium aluminum alloy is one of the most main magnesium alloy products, has good corrosion resistance and mechanical properties, and is one of important products for light magnesium alloy application, so that the magnesium aluminum alloy is widely applied to the fields of automobiles, aerospace and the like. The traditional research mainly improves the structure and mechanical properties of the Mg-Al alloy through alloying, heat treatment process improvement and extrusion treatment, and the mass fraction of Al added in the current magnesium-aluminum alloy is generally controlled within 3% -9%, for example, classical AZ31, AZ61 and AZ91 alloy products have good mechanical properties. However, the magnesium aluminum alloy extrusion treatment requires preheating the alloy, and the processing equipment is expensive and the size of the part is limited, thereby limiting the application of the magnesium aluminum alloy product. 3D printing (additive manufacturing) technology has received attention in recent years, and selective laser melting technology is one of the important methods important in additive manufacturing of alloys. The alloy piece prepared by the technology can be directly molded into high-precision and high-density metal components, the density is close to 100%, the mechanical properties are comparable to those of forgings, complex structures such as inner cavities, lattices and the like which are difficult to realize in the traditional process can be manufactured, a die is not needed, the customization and the small-batch production are efficient, the material utilization rate is over 95%, and the research, development and production cycle is greatly shortened. The main reason why the development of the selective laser melting technology of magnesium alloy products is limited is that the preparation is difficult due to the inflammability of magnesium powder. In order to promote the improvement of the mechanical property of the magnesium alloy laser additive component, grains can be refined by adding Al, Y and Sn elements with better stability for alloying, and refractory phases of Al 2 Y and Mg 2 Sn are formed, so that the effects of preventing the growth of the grains and strengthening the second phase are achieved. Disclosure of Invention Based on the technical background, the invention provides a novel high-strength Mg-Al-Y-Sn alloy based on a 3D printing technology and a preparation process thereof. According to the invention, by designing a magnesium alloy process and processing parameters capable of preparing a selective laser melting technology, the second-phase strengthening and further fine-grain strengthening are realized by adding alloy elements, so that the mechanical properties of the alloy are ensured. In order to achieve the above object, the present invention provides the following solutions: The Mg-Al-Y-Sn alloy based on the 3D printing technology comprises, by weight, 3.0-9.0wt% of Al, 0.5-2.0wt% of Y, 0.5-2.0wt% of Sn, and the balance of Mg and unavoidable impurity elements. According to the requirements of the invention, the Mg-Al-Y-Sn alloy is prepared by a selective laser melting technology by means of a printing technology, and the printing raw materials of the Mg-Al-Y-Sn alloy are pure Mg powder, mg-25Y master alloy powder, pure Sn powder and pure Al powder with the diameters of 20-50 mu m, and the specific processing comprises the following steps: S1, pure Mg powder, mg-25Y intermediate alloy powder, pure Sn powder and pure Al powder are mixed according to a target mass percentage; S2, independently drying the alloy powder, drying the powder in a vacuum drying oven at 70 ℃ for 3 hours, and further carrying out powder mixing treatment to obtain the target alloy powder for selective laser melting; S3, carrying out pre-melting drying treatment on alloy powder for selective laser melting, and simultaneously preheating a printed substrate, wherein the preheating temperature is 200 ℃; s4, performing powder extinguishing and selective laser melting in an argon atmosphere environment, and reducing the oxygen content (volume fraction) to below 120X 10 -6; S5, specifically setting the process parameters of selective laser melting, wherein the laser power is 100-150 mm/S of scanning speed, the printing power is 300-600W, the thickness of the powder layer is 10-30 mu m, and the scanning interval is 100-200 mu m; s6, selectively laser melting adopts a strip scanning strategy, and scanning layer by layer to obtain a printed magnesium alloy molding; And S7, carrying out proper heat treatment on the printing alloy piec