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Hot rolling process of high-plasticity and low-anisotropy magnesium alloy and sheet thereof

An anisotropic, magnesium alloy technology, applied in the field of metal materials, can solve the problems of large anisotropy, poor room temperature plasticity, and low strain hardening index, and achieve high strain hardening rate, easy control, and simple process.

Active Publication Date: 2010-10-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the disadvantages of poor room temperature plasticity, large anisotropy and low strain hardening index of current magnesium alloy sheets, the present invention provides a new type of magnesium alloy with high plasticity, weak basal texture and low anisotropy, and room temperature formability Composition and rolling process for sheet preparation, the magnesium alloy sheet prepared by this process has weak basal texture, high strain hardening index and low anisotropy factor, and the room temperature elongation is 30-45%. Horizontal and vertical are 30-40% and 35-45% respectively

Method used

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  • Hot rolling process of high-plasticity and low-anisotropy magnesium alloy and sheet thereof
  • Hot rolling process of high-plasticity and low-anisotropy magnesium alloy and sheet thereof
  • Hot rolling process of high-plasticity and low-anisotropy magnesium alloy and sheet thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1) Metal mold gravity casting is adopted, and Mg-Zn-Gd is melted and poured into a 150mm×200mm×200mm ingot through conventional magnesium alloy melting. The alloy composition weight percentage is Zn: 1.1%, Gd: 0.9%, and the magnesium content is more than Quantity, abbreviated as ZG11;

[0032] 2) After the ingot is homogenized at 450°C for 10 hours, the ingot is cut into billets of 150mm×100mm×20mm and face milled, and the billet after milling is kept at 450°C for rolling; the temperature of the rolls is room temperature 25 ℃, start rolling, the reduction in the first pass is 20%, and the reduction in each subsequent pass is 18%. After each rolling two passes, return to the furnace and heat it to temperature, then hold it for 5 to 10 minutes, take it out and continue rolling. Until the thickness of the plate is 3mm, the total reduction is 85%, due to the occurrence of complete dynamic recrystallization, the plate has a uniform and fine grain size, as shown in Figure 1(a...

Embodiment 2

[0036] 1) Metal mold gravity casting is adopted, Mg-Zn-Gd is melted and poured into a 150mm×200mm×200mm ingot through conventional magnesium alloy melting, the alloy composition weight percentage is Zn: 2.1%, Gd: 0.9%, and the magnesium content is more than balance Quantity, abbreviated as ZG21;

[0037]2) After the ingot is homogenized at 420°C for 10 hours, the ingot is cut into billets of 150mm×100mm×20mm and milled, and the milled billet is kept at 400°C for rolling; the roll is preheated to 100°C, start rolling, the reduction in the first pass is 20%, and the reduction in each subsequent pass is 15%. After each rolling two passes, return to the furnace to heat to temperature and keep it warm for 5 to 10 minutes to continue rolling , until the plate thickness is 3.2mm, the total reduction is 84%, and there is no crack on the surface of the plate, see figure 2 , has good rollability;

[0038] 3) The rolled plate is annealed at 320°C for 3 hours, the structure is shown in ...

Embodiment 3

[0041] 1) Metal mold gravity casting is adopted, and Mg-Zn-Y is melted and poured into a 150mm×200mm×200mm ingot through conventional magnesium alloy melting. The alloy composition weight percentage is Zn: 2.0%, Y: 1.1%, and the magnesium content is more than Quantity, abbreviated as ZW21;

[0042] 2) After the ingot is homogenized at 450°C for 10 hours, the ingot is cut into billets of 150mm×100mm×20mm and face-milled, and the billet after milling is kept at 450°C for rolling; the rolls are preheated to 25°C, start rolling, the reduction in the first pass is 18%, and the reduction in each subsequent pass is 18%, after each rolling two passes, return to the furnace to heat to temperature and keep it warm for 5 to 10 minutes to continue rolling , until the plate thickness is 3mm, the total reduction is 85%;

[0043] 3) The rolled plate is annealed at 350° C. for 1 hour, and then trimmed, covered with a plastic protective film and packaged.

[0044] 4) Refer to §3.6.2 of the n...

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Abstract

The invention relates to a hot rolling process of a high-plasticity and low-anisotropy magnesium alloy and a sheet thereof, which belongs to the technical field of metal materials. The magnesium alloy is an Mg-Zn-RE system and comprises the following components in percentage by weight: 0-5 percent of zinc, 0.1-10 percent of rare earth (RE) and the balance of Mg. The hot rolling process comprises the following steps: producing cast ingots by adopting a metal mould and a sand mould gravity casting or semicontinuous casting method; carrying out homogenized annealing treatment and face milling on the cast ingots; preserving the heat and then starting rolling; rolling sheets with the thickness of 10-600mm into sheets of 0.1-5mm; and carrying out heat treatment. The elongation percentage delta of the sheet after rolled or rolled and annealed along the rolling direction is more than or equal to 30 percent and the elongation along the transverse direction is more than or equal to 36 percent. The prepared sheet has the characteristics of weaker basal face texture, low anisotropy (average anisotropic factors are between 0.8 and 1.3) and higher hardening index (0.2-0.4). The favorable forming performance at room temperature of the sheet is ensured.

Description

technical field [0001] The invention relates to a high-plasticity, low-anisotropy magnesium alloy and a hot rolling process for its plate, belonging to the technical field of metal materials. Specifically, according to the weakening effect of rare earth elements (Gd or Y) on the texture, an appropriate amount of rare earth is added to the magnesium or magnesium-zinc binary alloy and the ingot structure is refined through Zr or Mn, and the subsequent hot rolling process and heat treatment process are controlled. To prepare the processing technology of magnesium alloy sheet with weak basal texture, high plasticity and low anisotropy, and improve the plasticity and formability of magnesium alloy sheet at room temperature and low temperature. Background technique [0002] Magnesium alloy has the advantages of small specific gravity, high specific strength, high damping, high thermal conductivity, good shock absorption, and easy recycling, and is more and more favored by the mark...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C23/06C22C23/00C22F1/06C21D1/26B21B37/74
CPCY02P10/20
Inventor 闫宏陈荣石韩恩厚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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