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Magnesium alloy grain refining method

A technology for grain refinement and magnesium alloy, applied in the field of magnesium alloy grain refinement, can solve the problems of poor forming ability, poor room temperature deformation ability, low room temperature plasticity, etc., and achieves abundant nucleation positions and high internal deformation storage energy. , the effect of improving strength and formability

Active Publication Date: 2017-05-31
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the characteristics of the hexagonal close-packed (HCP) crystal structure of magnesium alloys, there are few independent slip systems at room temperature, resulting in low room temperature plasticity, easy formation of basal texture, and poor formability, which have become obstacles to the large-scale development of magnesium alloy materials. application bottlenecks
[0003] The traditional magnesium alloy forging method has poor deformation ability at room temperature, and usually needs to be deformed at medium and high temperatures, supplemented by multiple intermediate annealings, resulting in complex processes and high costs. The grain size of the obtained structure is above the micron level, which greatly Restricts the production and application of magnesium alloy materials

Method used

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Embodiment

[0022] A method for refining magnesium alloy grains, specifically comprising the following steps:

[0023] (1) Production and processing in accordance with GB / T5154-2003 standard, after semi-continuous casting, hot-rolled blanking treatment is carried out between 350°C and 450°C, and then annealed and leveled at 400°C;

[0024] (2) Design regular octagonal prism plates: design regular octagonal prism plates on hot-rolled slabs so that they have 5 different deformation directions, such as figure 1 As shown, direction 1 indicates the rolling direction (ND) of the plate, direction 2 indicates the rolling direction (RD) of the plate, direction 3 indicates the transverse direction (TD) of the plate, and direction 4 indicates the direction 45TD at an angle of 45° to the transverse direction of the plate , direction 5 represents another direction 45TD' which forms an angle of 45° with the transverse direction of the plate;

[0025] (3) Combination of multiple deformation directions:...

Embodiment 1

[0030] The size of the regular octagonal prism taken off from the hot-rolled slab is: the upper and lower surfaces are regular octagons, the side length is 200 mm; the thickness is also 200 mm. Multi-directional cycle forging is carried out at room temperature, the strain rate is 1mm / min, and the combination of one cycle direction is: ND-RD-45TD-TD-45TD'. First deform 10% along the ND direction, then deform 4% along the RD direction, then deform 8% along the 45TD direction, then deform 5% along the TD direction, and finally deform 5% along the 45TD’ direction to complete a cycle. A combination of transformations can accumulatively deform 32%. This process can be cycled 10 times, and the cumulative deformation is 320%. The deformed sample is subjected to medium-temperature short-time heat treatment, the annealing temperature is 200° C., and the annealing time is 25 minutes. After annealing, a recrystallized equiaxed grain structure with a grain size of 650-750 nm can be obtain...

Embodiment 2

[0032] The size of the regular octagonal prism taken off from the hot-rolled slab is: the upper and lower surfaces are regular octagons, the side length is 200 mm; the thickness is also 200 mm. Multi-directional cycle forging is carried out at room temperature, the strain rate is 5mm / min, and the combination of one cycle direction is: ND-RD-45TD-TD-45TD'. First deform 12% along the ND direction, then deform 5% along the RD direction, then deform 10% along the 45TD direction, then deform 5% along the TD direction, and finally deform 5% along the 45TD’ direction to complete a cycle. A deformation combination can accumulatively deform 37%. This process can be cycled 7 times, and the cumulative deformation is 259%. The deformed sample is subjected to medium-temperature short-time heat treatment, the annealing temperature is 250° C., and the annealing time is 20 minutes. After annealing, a recrystallized equiaxed grain structure with a grain size of 700-800 nm can be obtained.

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Abstract

The invention discloses a magnesium alloy grain refining method. The method comprises the steps that a regular eight-edge prism plate is designed, multi-direction combination is conducted by selecting a specific direction, circulating multi-direction room-temperature deformation is conducted along the combination, and middle-temperature short-time annealing is conducted after the deformation amount is accumulated to a certain extent. The plate is subjected to combined deformation in the specific direction, primary contraction twin, secondary contraction twin and primary stretching twin are introduced, mutual cross partition between the different twins is brought into full play so that grains can be refined, in the annealing process, the deformation storage energy in the twins is high, and abundant nucleation positions can be provided, so that even recrystallized small grains are obtained in a short time, the basal texture of a magnesium alloy plate is weakened, and accordingly the strength and the forming performance of the magnesium alloy plate are greatly improved.

Description

technical field [0001] The invention relates to a method for refining magnesium alloy grains. Background technique [0002] Magnesium and magnesium alloys have many advantages such as light weight, good thermal and electrical conductivity, damping and shock absorption, electromagnetic shielding, etc., and have broad application prospects. However, due to the characteristics of the hexagonal close-packed (HCP) crystal structure of magnesium alloys, there are few independent slip systems at room temperature, resulting in low room temperature plasticity, easy formation of basal texture, and poor formability, which have become obstacles to the large-scale development of magnesium alloy materials. application bottlenecks. [0003] The traditional magnesium alloy forging method has poor deformation ability at room temperature, and usually needs to be deformed at medium and high temperatures, supplemented by multiple intermediate annealings, resulting in complex processes and high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
CPCC22F1/06
Inventor 汪炳叔刘慧敏邓丽萍石晶晶崔凯旋
Owner FUZHOU UNIV
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