High creep resistance quasicrystal-containing double phase magnesium-lithium alloy and preparation method thereof
A magnesium-lithium alloy and quasicrystal technology, applied in the field of magnesium-lithium alloys, can solve the problems of poor creep resistance of magnesium-lithium alloys, and achieve the effects of low density, high service safety, and high-temperature creep resistance.
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[0036] The preparation method of the magnesium-lithium alloy with high creep resistance performance of the present invention includes introducing quasi-crystalline phase into the alloy matrix and subsequent hot extrusion processing. The specific steps of the specific smelting and casting and subsequent hot extrusion process are as follows:
[0037] 1) Drying and preheating: the drying temperature of conventional auxiliary materials (covering agent / refining agent) is 120-180°C; the preheating temperature of various ingredients and casting molds is 150-300°C; Slag spoons, bell jars, casting spoons, etc.) are cleaned and preheated in a molten washing flux at 700-740°C.
[0038] In the present invention, the covering agent can be a mixture of LiCl and LiF, wherein the weight ratio of LiCl and LiF is (3:1)-(4:1), and their weight sum accounts for 2-4% of the total weight of the charge. In addition, the refining agent may be LiBr.
[0039]2) Melting of magnesium ingots: set the te...
Embodiment 1
[0048] Ⅰ), alloy composition
[0049] According to the following proportions, 15 kilograms of lithium-containing magnesium alloy materials are weighed and taken out: 900 grams of lithium (Li), 900 grams of zinc (Zn), 750 grams of magnesium-yttrium master alloy (Mg-24wt%Y) and the balance Magnesium (Mg).
[0050] Ⅱ), alloy smelting and casting
[0051] The alloy is smelted in a 15 kg capacity crucible and electric resistance furnace. The crucible and casting molds are made of mild steel. Taking Example 1 as an example, the smelting and casting process of the alloy will be described in detail below.
[0052] 1) Set the target temperature of the crucible to 720°C and start heating; then preheat various ingredients such as pure magnesium, pure zinc, magnesium-yttrium intermediate alloy, and pure lithium in an oven to 150°C, and at the same time will account for 2 % of the covering agent (the covering agent uses LiCl and LiF, and the weight ratio of LiCl and LiF is 3:1) is bake...
Embodiment 2
[0069] Ⅰ), alloy composition
[0070] Refer to the composition ratio of Example 1.
[0071] Ⅱ), alloy smelting and casting
[0072] The smelting and casting of reference embodiment 1.
[0073] Ⅲ), hot extrusion processing
[0074] Referring to the extrusion process of Example 1.
[0075] Ⅳ), microstructure characterization
[0076] Refer to the microstructure characterization of Example 1.
[0077] Ⅴ) High temperature mechanical properties test
[0078] Refer to the mechanical property test of Example 1. In this embodiment, the tensile strength of the lithium-containing magnesium alloy material at 300°C is 22MPa, the yield strength is 15MPa, the elongation is δ=82%, and the density is 1.43g / cm 3 , and the corresponding tensile curves are listed in the attached figure 2 superior.
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Abstract
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