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Machining method of ultrafine-grain high-strength magnesium alloy sheet

A processing method and technology for magnesium alloys, applied in metal rolling and other directions, can solve the problems of high cost of rare earth elements, limited natural reserves, unrealistic heavy rare earths, etc., achieve high yield, reduce energy consumption and cost, and improve rolling. The effect of pass reduction

Active Publication Date: 2018-05-29
宿迁市河海大学研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, rare earth magnesium alloys also have great disadvantages: on the one hand, the cost of rare earth elements is high and natural reserves are limited, especially heavy rare earths are not realistic in industrial production.
[0006] At present, researchers at home and abroad have carried out a lot of research work on the equal channel angular extrusion of magnesium alloys, but there are still some gaps.

Method used

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  • Machining method of ultrafine-grain high-strength magnesium alloy sheet
  • Machining method of ultrafine-grain high-strength magnesium alloy sheet
  • Machining method of ultrafine-grain high-strength magnesium alloy sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] In this example, AZ91 (Mg-9wt%Al-1wt%Zn) magnesium alloy is used as the test material.

[0065] Firstly, the as-cast AZ91 magnesium alloy was processed into a cuboid block of 49mm×49mm×100mm by wire cutting.

[0066] figure 1 It is the metallographic structure of as-cast AZ91 without any treatment, showing coarse dendrites. Then put it in the RD-ECAP mold and heat it to 250°C for 30-60 minutes, and perform 16 passes of ECAP processing. After ECAP processing, the average grain size is about 20 microns, such as figure 2 .

[0067] The mechanical properties of the prepared ultra-fine grained AZ91 magnesium alloy and the untreated as-cast AZ91 magnesium alloy were tested, and the results are as follows image 3 Shown: As-cast AZ91 has a yield strength of 100Mpa, an ultimate strength of 220Mpa, and a maximum elongation of 14.5%. The AZ91 magnesium alloy processed by ECAP has a longitudinal yield strength of 200Mpa, an ultimate strength of 390Mpa, and a maximum elongatio...

Embodiment 2

[0073] In this embodiment, AZ91 (Mg-9wt%Al-1wt%Zn) magnesium alloy is used.

[0074] The difference from Example 1 is that the holding temperature in the first step is 350°C, and the holding time is 60 minutes. The conditions are the same as in Case 1. The yield strength of the obtained magnesium alloy sheet along the rolling direction is 410MPa, the ultimate strength is 459Mpa, and the maximum elongation is 10%, and the yield strength along the normal direction of rolling is 425MPa, the ultimate strength is 478MPa, and the maximum elongation is 9 %.

Embodiment 3

[0076] In this embodiment, AZ91 (Mg-9wt%Al-1wt%Zn) magnesium alloy is used.

[0077] The difference from Example 1 is that the holding temperature in the first step is 350°C, and the holding time is 60 minutes. The conditions are the same as in Case 1. The yield strength of the obtained magnesium alloy sheet along the rolling direction is 450MPa, the ultimate strength is 491Mpa, and the maximum elongation is 10.5%. The yield strength along the normal direction of rolling is 390MPa, the ultimate strength is 419MPa, and the maximum elongation is 10%. %.

[0078] From the above examples, it can be seen that the yield strength of the AZ91 magnesium alloy plate after equal channel angular extrusion, extrusion blanking and rolling combined processing is 390MPa, the ultimate strength is above 450MPa, and the maximum elongation is greater than 6.8%. High-strength magnesium alloy sheets can be obtained.

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Abstract

The invention provides a machining method of an ultrafine-grain high-strength magnesium alloy sheet. The machining method comprises the following steps: S1, performing equal channel angular extrusionin a rotary mould: placing an as-cast magnesium alloy blank into the mould, heating, preserving heat, and then performing equal channel angular extrusion on the heated blank in the rotary mould for atleast three times to obtain an ultrafine-grain magnesium alloy block; S2, extruding and cogging: extruding and cogging to obtain a thick magnesium alloy board; S3, performing subsequent multi-pass rolling: heating a cogged product obtained in the step S2, and performing multi-pass rolling to obtain the magnesium alloy sheet. Inventors perform detailed research on the machining technique, parameters and material properties of the integrated machining technology; the purposes of increasing the machining yield, lowering the machining temperature, saving energy and resources, reducing the cost, improving the production efficiency and producing a wide magnesium alloy board while the high-performance magnesium alloy sheet is obtained are achieved; application of the high-performance magnesium alloy is promoted.

Description

technical field [0001] The invention relates to the technical field of processing methods for magnesium alloy thin plates, in particular to a processing method for ultrafine-grained high-strength magnesium alloy thin plates. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in industrial applications, and has the characteristics of low density, high specific strength, high specific stiffness and good electromagnetic shielding. It has broad application prospects in automotive lightweight, 3C electronic housing, aerospace and other fields. At present, the application of magnesium alloys is mainly in die casting, die casting and semi-solid forming products, and deformed magnesium alloys are only used in high-end frontier fields such as aerospace, electronics and military. Compared with traditional structural materials such as steel, the strength of cast magnesium alloy is still low, and it can only be used for non-load-bearing st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/00B21B1/38
Inventor 李玉华马爱斌江静华徐琼邱超
Owner 宿迁市河海大学研究院
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