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A high strength and toughness magnesium alloy with controllable long-period phase size and its preparation method

A long-period, magnesium alloy technology, applied in metal rolling, temperature control, elongation control, etc., can solve the problems of kink deformation, difficult to obtain 18R long-period equality, improve plasticity and forming ability, avoid sample cracking, The effect of high strength and plasticity

Active Publication Date: 2021-04-27
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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  • A high strength and toughness magnesium alloy with controllable long-period phase size and its preparation method
  • A high strength and toughness magnesium alloy with controllable long-period phase size and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition is Mg-6.84wt%Y-2.52wt%Zn, the alloy ingot that Y:Zn atomic ratio is 2 is cut into the rod-shaped sample that diameter is 14mm, is placed in the mold that band inner diameter is 15mm cylindrical cavity, The sample was thermally compressed by an indenter at 420°C with a compression rate 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] The composition is Mg-6.84wt%Y-2.52wt%Zn, and the alloy ingot with Y:Zn atomic ratio of 2 is cut into a rod-shaped sample with a diameter of 12mm, and placed in a mold with a cylindrical cavity with an inner diameter of 15mm. The sample was thermally compressed by an indenter at 420°C with a compression rate of 30%, 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 3

[0029] The composition is Mg-6.84wt%Y-2.52wt%Zn, the alloy ingot that Y:Zn atomic ratio is 2 is cut into the bar-shaped sample that diameter is 10mm, is placed in the mold that band inner diameter is 15mm cylindrical cavity, The sample was thermally compressed by an indenter at 420°C with a compression rate of 50%, 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.

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Abstract

The invention discloses a high-strength and tough magnesium alloy with controllable long-period phase size and a preparation method thereof. The method comprises the following steps: A. Cutting a Mg-Y-Zn alloy ingot into rods with a diameter of 10-14 mm The sample is placed in a mold with a cylindrical cavity with an inner diameter of 15 mm, and the sample is thermally compressed by the indenter to obtain an alloy rod in which the 18R long-period phase is twisted to varying degrees; B. The above alloy rod is subjected to multiple Sub-hot drawing process to obtain 18R long-period phase refinement and dispersion of high strength and toughness magnesium alloy. The present invention realizes the pre-kink of the 18R long-period phase by thermal compression, and realizes the control of the kink band density and degree by controlling the compression rate, and then utilizes subsequent large-strain multi-pass thermal drawing to make the long-period phase from kink With fracture refinement, 18R long-period phase refinement and size control are obtained, which significantly improves the strength and plasticity of the alloy.

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 Patents(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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