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Three-level aging heat treatment process for nanometer magnesium alloy

An aging heat treatment, three-stage aging technology, applied in the field of nanomaterial heat treatment, to achieve the effect of ensuring peak aging

Inactive 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

[0003] At present, there is no literature report to explore the aging heat treatment process of nano-magnesium alloys, especially for nano-magnesium alloys produced by extrusion-rapid cold forging

Method used

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  • Three-level aging heat treatment process for nanometer magnesium alloy
  • Three-level aging heat treatment process for nanometer magnesium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Nano-magnesium alloy with an average grain size of 50nm (alloy composition (w%): Gd: 8%, Y: 4%, Zr: 0.5%, the rest is Mg and non-removable impurity elements) at 165 ° C The first-stage aging treatment, the aging time is 5h, and then the nano-magnesium alloy after the first-stage aging treatment is subjected to the second-stage aging treatment at 175°C, and the aging time is 6h, and finally the alloy after the second-stage aging is subjected to three-stage aging at 240°C. Level aging treatment, aging time 12h. According to GB / T228-2002, the mechanical properties of the aged magnesium alloy were tested and compared with the pre-aging alloy. The results showed that compared with the unaged nano-magnesium alloy, the tensile strength of the aged magnesium alloy at room temperature was increased by 102MPa, and the yield strength was increased by 132MPa. The tensile strength is up to 749MPa, and the yield strength is up to 710MPa. The specific results are shown in Table 1.

Embodiment 2

[0020] Nano-magnesium alloy with an average grain size of 70nm (alloy composition (w%): Gd: 10%, Y: 6%, Zr: 0.4%, the rest is Mg and non-removable impurity elements) at 155 ° C The first-stage aging treatment, the aging time is 6h, then the nano-magnesium alloy after the first-stage aging treatment is subjected to the second-stage aging treatment at 165°C, and the aging time is 7h, and finally the alloy after the second-stage aging is subjected to three-stage aging at 230°C. Level aging treatment, aging time 14h. According to GB / T228-2002, the mechanical properties of the aged magnesium alloy were tested and compared with the pre-aging alloy. The results showed that, compared with the unaged nano-magnesium alloy, the room temperature tensile strength of the aged magnesium alloy was increased by 105MPa, and the yield strength was increased by 123MPa. The tensile strength is up to 739MPa, and the yield strength is up to 692MPa. The specific results are shown in Table 1.

Embodiment 3

[0022] The nano-magnesium alloy with an average grain size of 90nm (alloy composition (w%): 12%, Y: 3%, Zr: 0.7%, the rest is Mg and non-removable impurity elements) at 145 ° C for the first First-level aging treatment, aging time 7h, then the nano-magnesium alloy after the first-level aging treatment is subjected to second-level aging treatment at 155°C, and the aging time is 9h, and finally the alloy after the second-level aging treatment is subjected to third-level aging at 210°C Treatment, aging time 22h. According to GB / T228-2002, the mechanical properties of the aged magnesium alloy were tested and compared with the pre-aging alloy. The results showed that compared with the unaged nano-magnesium alloy, the room temperature tensile strength of the aged magnesium alloy was increased by 100MPa, and the yield strength was increased by 128MPa. The tensile strength is up to 710MPa, and the yield strength is up to 675MPa. The specific results are shown in Table 1.

[0023]

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Abstract

The invention relates to a three-level aging heat treatment process for nanometer magnesium alloy. The 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 nanometer magnesium alloy obtained by extrusion-fast cold forging with average crystallite size of 40-100 nm is subjected to level 1 aging heat treatment at 140-170 DEG C for 4-8 hours, and then the alloy subjected to level 1 aging treatment is subjected to level 2 aging heat treatment at 150-180 DEG C for 5-10 hours, finally the alloy subjected to level 2 aging treatment is subjected to level 3 aging heat treatment at 200-250 DEG C for 10-30 hours. Compared with the nanometer magnesium alloy without aging treatment, the strength and the yield strength of the alloy subjected to three-level aging heat treatment is increased by 100-105 MPa and 123-135 MPa respectively, and the alloy has a strength of extension of 705-750 MPa and yield strength of 670-715 MPa.

Description

technical field [0001] The invention relates to the field of nano-material heat treatment, in particular to a nano-magnesium alloy three-stage aging heat treatment process. Background technique [0002] Nanomaterials have been used in many high-tech fields due to their excellent physical, chemical and mechanical properties, and have penetrated into all aspects of life. Nano-magnesium alloys not only have the advantages of high damping, high specific strength, and high specific rigidity that ordinary magnesium alloys have, but also have high strength and good corrosion resistance. Most magnesium alloys are age-strengthened alloys, so further improving the strength of nano-magnesium alloys through aging heat treatment is a key means to further improve the strength of nano-magnesium alloys. [0003] At present, there is no literature report to explore the aging heat treatment process of nano-magnesium alloys, especially for nano-magnesium alloys produced by extrusion-rapid col...

Claims

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Application Information

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IPC IPC(8): C22F1/06
Inventor 刘楚明万迎春唐蓓李慧中邹利民
Owner CENT SOUTH UNIV
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