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High-strength-and-toughness magnesium alloy with controllable long-period phase size and preparation method thereof

A long-period, magnesium alloy technology, applied in temperature control, metal rolling, elongation control, etc., can solve the problems of difficult to obtain 18R long-period phase, kink deformation, etc., to avoid cracking of samples, improve plasticity and formability , Improve the effect of plasticity

Active Publication Date: 2019-06-21
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the good plasticity of the 18R long-period phase, it can produce kink deformation during plastic processing, so the long-period phase in the deformed alloy is often in the shape of twisted bands or laths, even if the thinning effect is significant It is also difficult to obtain uniformly refined 18R long-period phases by severe plastic processing technology.

Method used

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  • High-strength-and-toughness magnesium alloy with controllable long-period phase size and preparation method thereof
  • High-strength-and-toughness magnesium alloy with controllable long-period phase size and preparation method thereof
  • High-strength-and-toughness magnesium alloy with controllable long-period phase size and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] Cut an alloy ingot with a composition of Mg-6.84wt%Y-2.52wt%Zn, and an atomic ratio of Y:Zn of 2 into a rod-shaped sample with a diameter of 14 mm, and place it in a mold with a cylindrical cavity with an inner diameter of 15 mm , the sample was thermally compressed by an indenter at 420°C with a compression ratio of 10%, and an alloy rod with kinked 18R long-period phase was obtained. The above alloy rod was subjected to multi-pass hot drawing processing, the drawing temperature was 390°C, the single-pass deformation was 15%, the drawing speed was 4mm / s, and the strain was 5.4. After the drawing was completed, a High strength and toughness magnesium alloy.

Embodiment 2

[0027] Cut an alloy ingot with a composition of Mg-6.84wt%Y-2.52wt%Zn, and an atomic ratio of Y:Zn of 2 into a rod-shaped sample with a diameter of 12 mm, and place it in a mold with a cylindrical cavity with an inner diameter of 15 mm , the sample was thermally compressed by the indenter at 420 ℃, the compression rate was 30%, and the alloy rod with kinked 18R long-period phase was obtained. The above alloy rod was subjected to multi-pass hot drawing processing, the drawing temperature was 390°C, the single-pass deformation was 15%, the drawing speed was 4mm / s, and the strain was 5.4. After the drawing was completed, a High strength and toughness magnesium alloy.

Embodiment 3

[0029] Cut an alloy ingot with a composition of Mg-6.84wt%Y-2.52wt%Zn, and an atomic ratio of Y:Zn of 2 into a rod-shaped sample with a diameter of 10 mm, and place it in a mold with a cylindrical cavity with an inner diameter of 15 mm , the sample was thermally compressed by the indenter at 420 ℃, the compression rate was 50%, and the alloy rod with kinked 18R long-period phase was obtained. The above alloy rod was subjected to multi-pass hot drawing processing, the drawing temperature was 390°C, the single-pass deformation was 15%, the drawing speed was 4mm / s, and the strain was 5.4. After the drawing was completed, a High strength and toughness magnesium alloy.

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Abstract

The invention discloses a high-strength-and-toughness magnesium alloy with the controllable long-period phase size and a preparation method thereof. The method comprises the following steps that A, aMg-Y-Zn alloy casting ingot is cut into a rod-shaped sample with the diameter being 10-14 mm, the sample is placed in a mold with a cylindrical cavity with the inner diameter being 15 mm, the sample is thermally compressed through a pressing head, and an alloy rod with 18R long-period phases being kinked to different degrees is obtained; and B, the above alloy rod is subjected to multi-pass hot drawing machining, and the high-strength-and-toughness magnesium alloy with the refined and dispersive 18R long-period phases is obtained. By means of the high-strength-and-toughness magnesium alloy, thermal compression is used for realizing pre-kinking of the 18R long-period phases, the compression ratio is controlled to achieve kink band density and degree control, then subsequent large-strain multi-pass hot drawing is used to break and refine the long-period phases from a kink band, the obtained 18R long-period phases are refined and controllable in size, and the strength and plasticity of the alloy are significantly improved.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy processing, and relates to a high-strength and tough magnesium alloy with controllable long-period phase size and a preparation method thereof, in particular to a high-strength magnesium alloy with controllable long-period phase size prepared by thermal compression and subsequent hot drawing. Tough magnesium alloy and its preparation method. Background technique [0002] Magnesium alloys have a series of advantages such as low density, high specific strength and specific stiffness, good thermal and electrical conductivity, and rich resource reserves, and are known as green engineering materials in the 21st century. In the fields of aerospace, defense industry, automobile and new energy vehicles, electronic products and other fields, the demand for lightweight is increasing. It is the general trend for magnesium alloy to replace aluminum alloy and even some steel materials. However, compar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22F1/06B21C1/00B21C9/00B21B3/00B21B1/46B21B37/74B21B37/56
Inventor 刘欢孙甲鹏吴玉娜王策黄河江静华马爱斌
Owner HOHAI UNIV
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