Method for preparing ultrahigh strength high toughness magnesium alloy

A tough magnesium alloy, ultra-high-strength technology, applied in the field of ultra-high-strength and high-toughness magnesium alloy preparation, can solve the problems that limit the large-scale application of magnesium alloys, and achieve the effect of improving performance and preventing cracking

Active Publication Date: 2012-12-19
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Rapid deformation of magnesium alloys at lower temperatures can greatly refine the grains of magnesium alloys and increase the strength of magnesium alloys. There is no report showing that magnesium alloys with ultra-high strength of 700MPa have been prepared by this technology, which greatly limits the development of magnesium alloys. The large-scale application of alloys, so it is of great significance to explore and develop a method for preparing ultra-high-strength and high-toughness magnesium alloys

Method used

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  • Method for preparing ultrahigh strength high toughness magnesium alloy
  • Method for preparing ultrahigh strength high toughness magnesium alloy
  • Method for preparing ultrahigh strength high toughness magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] First, the magnesium alloy (alloy composition (w%): Gd: 8%, Y: 4%, Zr: 0.5%, the rest is Mg and impurity elements that cannot be removed) is subjected to strong thermal deformation of the semi-continuous casting ingot, and the deformation temperature is 420°C, the deformation force is 8×10 3 KN, the deformation speed is 18mm / s, and the total deformation is 99%; then the magnesium alloy after strong thermal deformation is subjected to rapid temperature deformation, the deformation temperature is 150°C, the deformation force is 2KN, the deformation speed is 21mm / s, the total The amount of deformation is 39%; after rapid thermal deformation, the alloy is subjected to aging heat treatment, and the aging process is: 210°C / 28h. According to GB / T228-2002, the mechanical properties of magnesium alloys in warm-worked state and aging state were tested, and the results are shown in Table 1.

Embodiment 2

[0021] First, the magnesium alloy (alloy composition (w%): Gd: 10%, Y: 6%, Zr: 0.4%, the rest is Mg and impurity elements that cannot be removed) is subjected to strong thermal deformation for semi-continuous casting. at 400°C, the deformation force is 7×10 3 KN, the deformation speed is 16mm / s, and the total deformation is 98%; then the magnesium alloy after strong thermal deformation is subjected to rapid temperature deformation, the deformation temperature is 140°C, the deformation force is 3KN, the deformation speed is 19mm / s, the total The amount of deformation is 33%; after the rapid thermal deformation, the alloy is subjected to aging heat treatment and the aging process is: 220°C / 24h. According to GB / T228-2002, the mechanical properties of magnesium alloys in warm-worked state and aging state were tested, and the results are shown in Table 1.

Embodiment 3

[0023] First, the magnesium alloy (alloy composition (w%): 12%, Y: 3%, Zr: 0.7%, the rest is Mg and impurity elements that cannot be removed) is subjected to strong thermal deformation for semi-continuous casting, and the deformation temperature is 380 ℃, the deformation force is 6×10 3 KN, the deformation speed is 14mm / s, and the total deformation is 95%; and then the magnesium alloy after strong thermal deformation is subjected to rapid temperature deformation, the deformation temperature is 130°C, the deformation force is 3KN, the deformation speed is 18mm / s, the total The amount of deformation is 25%; after rapid thermal deformation, the alloy is subjected to aging heat treatment and the aging process is: 230°C / 23h. According to GB / T228-2002, the mechanical properties of magnesium alloys in warm-worked state and aging state were tested, and the results are shown in Table 1.

[0024]

[0025]

[0026]

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Abstract

The invention relates to a preparation method for ultrahigh strength high toughness magnesium alloy. The ultrahigh strength high toughness magnesium alloy comprises the following components in percentage by mass: 6-13% of gadolinium, 2-6% of yttrium, 0.3-0.8% of zirconium, and the balance of magnesium and inevitable impurities. The magnesium alloy billets are subjected to powerful thermal deformation, and then the magnesium alloy subjected to thermal deformation is subjected to rapid warm deformation at 110-150 DEG C, wherein the deformation force is 1-4KN, the deformation speed is 15-24mm / s, and the total deformation is 10-40%. The magnesium alloy is subjected to aging heat treatment after rapid warm deformation at 140-250 DEG C for 23-38 hours. The alloy subjected to warm deformation at room temperature has a strength of extension of 610-647 MPa, the yield strength of 547-585 MPa, the percentage elongation after fracture of 6-10%. The aging state alloy at room temperature has the strength of extension of 710-749 MPa, the yield strength of 675-710 MPa, and percentage elongation after fracture of 3.8-6.9 %.

Description

technical field [0001] The invention relates to the field of magnesium alloy processing, in particular to a method for preparing an ultrahigh-strength and high-toughness magnesium alloy. Background technique [0002] Magnesium alloy has very good damping performance, high temperature creep performance, dimensional stability and good cold and hot processing performance, and is widely used in aerospace, automobile and other fields. In the aerospace field, the specific power can be increased by about 30% for every 1g reduction in the mass of the aircraft. The demand for magnesium alloys in the aerospace field is increasingly urgent; while the shell and frame of electrical products require materials with good thermal conductivity, shock absorption and electromagnetic shielding. Performance; the transportation industry also requires the weight of transportation tools to be reduced due to energy saving and emission reduction. However, the strength and toughness of existing magnes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06C22C23/06
Inventor 刘楚明万迎春唐蓓蒋树农韩坦
Owner CENT SOUTH UNIV
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