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A high-speed extrusion magnesium alloy deformation material with low rare earth content and its preparation process

A preparation process and technology of magnesium alloy, applied in the field of metal materials, can solve the problems of high production and application costs, low extrusion speed, poor room temperature plasticity of extruded materials, etc., and achieve lower production and application costs, high extrusion speed, The effect of improving plasticity and subsequent formability

Active Publication Date: 2019-06-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For current commercial magnesium alloys (such as Mg-Al-Zn series and Mg-Zn-Zr series alloys) and existing patent reports, the extrusion speed of extrusion materials is low, and the room temperature plasticity of extrusion materials is poor, resulting in production and application costs High problem, the present invention provides a low-rare-earth content high-speed extrusion magnesium alloy deformation material and its preparation process, the extrusion material is produced by an extrusion process with an exit speed of not less than 24m / min, the surface of the obtained extrusion material is smooth, Without any surface cracks, and the extruded material has weak basal texture or weak non-basal texture, its maximum extreme density value is ≤4, and the optimized composition can make the room temperature elongation of the extruded material ≥25%

Method used

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  • A high-speed extrusion magnesium alloy deformation material with low rare earth content and its preparation process
  • A high-speed extrusion magnesium alloy deformation material with low rare earth content and its preparation process
  • A high-speed extrusion magnesium alloy deformation material with low rare earth content and its preparation process

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Effect test

Embodiment 1

[0031]1) Metal mold gravity casting is adopted, Mg-Zn-RE, RE (rare earth) is Gd, melted and poured into an ingot of 80mm×180mm×200mm by conventional magnesium alloy, the weight percentage of the alloy composition is Zn: 0.20%, Gd: 0.12%, the magnesium content is the balance balance;

[0032] 2) Homogenize the ingot at 450°C for 10 hours, and then cut the homogenized ingot into corresponding extrusion billets;

[0033] 3) First heat the extrusion die to the extrusion deformation temperature of 275°C, then put the extrusion billet into the extrusion barrel and heat for 5 minutes, after the extrusion billet reaches the deformation temperature of 300°C, it will be processed into a rod at high speed, and the extrusion exit The speed is 60m / min, and the extrusion ratio is 20;

[0034] 4) The surface of the extruded material is smooth without any surface cracks, see figure 1 ; The texture of the extruded material is a weak basal texture, and its maximum extreme density value is 3.1...

Embodiment 2

[0036] 1) Using metal mold gravity casting, Mg-Zn-RE, RE (rare earth) is Gd, melted and poured into an ingot of 80mm×180mm×200mm by conventional magnesium alloy, the weight percentage of the alloy composition is Zn: 1.58%, Gd: 0.52%, the magnesium content is the balance balance;

[0037] 2) Homogenize the ingot at 480°C for 12 hours, and then cut the homogenized ingot into corresponding extrusion billets;

[0038] 3) First heat the extrusion die to the extrusion deformation temperature of 300°C, then put the extrusion billet into the extrusion barrel and heat for 5 minutes, after the extrusion billet reaches the deformation temperature of 300°C, it is processed into a bar at high speed, and the extrusion exit The speed is 60m / min, and the extrusion ratio is 20;

[0039] 4) The surface of the extruded material is smooth without any surface cracks, see figure 1 ; The texture of the extruded material is a weak non-basal texture, and the non-basal texture components are between ...

Embodiment 3

[0041] Design experiment magnesium alloy composition and casting method, billet preparation process are identical with embodiment 2;

[0042] 1) First heat the extrusion die to the extrusion deformation temperature of 300°C, then put the extrusion billet into the extrusion barrel and heat for 5 minutes, after the extrusion billet reaches the deformation temperature of 300°C, it is processed into a bar at high speed, and the extrusion exit The speed is 24m / min, and the extrusion ratio is 20;

[0043] 2) The surface of the extruded material is smooth without any surface cracks, see figure 1 ; The texture of the extruded material is a weak non-basal texture, and the non-basal texture components are between the orientations of and , and the maximum extreme density value is 2.2, See figure 2 ; Elongation at room temperature of extrusion material is 32.9%, see Table 1.

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Abstract

The invention discloses a high-speed extruded magnesium alloy deformed profile low in rare earth content and a preparation technique thereof, and belongs to the technical field of metal materials. The magnesium alloy comprises, by weight, 0.1-2.0% of Zn, 0.1-0.9% of RE, and the balance Mg. A trace of or a small amount of rare earth (RE) is added into the magnesium alloy, and the alloy cost is effectively reduced. Production is conducted with the speed of an extrusion outlet larger than 24 m / min, the extrusion production efficiency is high, the cost of the extruded profile is reduced, the surface of the obtained extruded profile is smooth and free of cracks, and the yield of the extruded profile is guaranteed. Meanwhile, the obtained extruded profile might have weak basal textures or weak non-basal textures, and the maximum pole density value of the weak basal textures or the weak non-basal textures is smaller than or equal to 4; and through optimized constituents, the room-temperature elongation of the extruded profile can be larger than or equal to 25%.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a high-speed extruded magnesium alloy deformation material with low rare earth content and a preparation process thereof. Background technique [0002] As the lightest metal structural material, magnesium alloy has a series of advantages such as high specific strength and specific stiffness, excellent thermal conductivity and electrical conductivity, good electromagnetic shielding performance, and recyclability. It is known as "green structural material in the 21st century". In recent years, the rapid development of the automobile industry and the enhancement of people's awareness of energy saving, safety and environmental protection of automobiles have made magnesium alloys more and more concerned in the fields of transportation such as automobiles. However, due to the close-packed hexagonal crystal structure of magnesium alloy, its plastic processing performance is poor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/04C22C23/06C22C1/02C22F1/06B21C23/00B21C23/01
CPCB21C23/001B21C23/01C22C1/02C22C23/04C22C23/06C22F1/06
Inventor 陈荣石姜明光闫宏柯伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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