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Cast magnesium matrix composite material with high strontium and high aluminum content and preparation method
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A technology for composite materials and casting magnesium, which is applied in the field of casting magnesium-based composite materials with high strontium and high aluminum content and its preparation, to achieve the effect of improving performance and simplifying the process flow
Active Publication Date: 2019-07-02
NORTHEASTERN UNIV
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At present, the alloying elements added to non-rare earth magnesium alloys generally do not exceed 10% (mass percentage), and the strengthening design ideas of magnesium alloy materials are mostly imitated by aluminum alloy materials, that is, the heat treatment process of microalloying + solid solution-aging is obtained. Fine second phases with high densityprecipitation, such as in Mg-Zn alloys, the size and morphology of precipitates are controlled by microalloying elements such as Ag, Ca, Zr and solid solution-aging heat treatment process, but for a large number of eutectic There are few reports on the design of magnesium alloy materials with microstructure or even complete eutectic microstructure
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Embodiment 1
[0032] A cast magnesium-based composite material with high strontium and high aluminum content, the components of the magnesium-based composite material are as follows: Sr: 2wt.%, Al: 3wt.%, Mn: 0.1wt.%, and the rest are Mg and impurities; Mn is a magnesium-manganese master alloy with a Mn content of 6wt.%, and the purity of other metals is above 99%.
[0033] A method for preparing a cast magnesium-based composite material with high strontium and high aluminum content, comprising the steps of:
[0034] (1) Prepare raw materials:
[0035] Weighing the required raw materials according to the mass percentage ratio of the components of a casting magnesium-based composite material with high strontium and high aluminum content;
[0037] First, in the smelting unit CO 2 +SF 6 Under the protection of protective gas, add pure magnesium, heat to 750 ° C and stir until it is completely melted, the CO 2 and SF 6 The volume ratio is 199:1;
[0038]Then, ...
Embodiment 2
[0041] A cast magnesium-based composite material with high strontium and high aluminum content, the components of the magnesium-based composite material are as follows: Sr: 4wt.%, Al: 6wt.%, Zn: 0.5wt.%, and the rest are Mg and impurities; the purity of each metal is above 99%.
[0042] A method for preparing a cast magnesium-based composite material with high strontium and high aluminum content, comprising the steps of:
[0043] (1) Prepare raw materials:
[0044] Weighing the required raw materials according to the mass percentage ratio of the components of a casting magnesium-based composite material with high strontium and high aluminum content;
[0046] First, in the smelting unit CO 2 +SF 6 Under the protection of protective gas, add pure magnesium, heat to 760 ° C and stir until it is completely melted, the CO 2 and SF 6 The volume ratio is 168:1;
[0047] Then, keep the temperature at 760°C, add other weighed raw materials successivel...
Embodiment 3
[0050] A cast magnesium-based composite material with high strontium and high aluminum content, the composition of the magnesium-based composite material is calculated by mass percentage: Sr: 5wt.%, Al: 5wt.%, Zn: 3wt.%, and the rest is Mg and impurities; the purity of each metal is above 99%.
[0051] A method for preparing a cast magnesium-based composite material with high strontium and high aluminum content, comprising the steps of:
[0052] (1) Prepare raw materials:
[0053] Weighing the required raw materials according to the mass percentage ratio of the components of a casting magnesium-based composite material with high strontium and high aluminum content;
[0055] First, in the smelting unit CO 2 +SF 6 Under the protection of protective gas, add pure magnesium, heat to 770 ° C and stir until it is completely melted, the CO 2 and SF 6 The volume ratio is 152:1;
[0056] Then, keep the temperature at 770°C, add other weighed raw mater...
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Abstract
The invention provides a cast magnesium matrix composite material with the high strontium and high aluminum content. The magnesium matrix composite material comprises the ingredients of, in percentageby mass, 2.00-35.00% of Sr, 3.00-25.00% of Al, 0.00-3.00% of Ca, 0.00-8.00% of Ba, 0.00-8.00% of Zn, 0.00-5.00% of Mn, 0.00-8.00% of Sn and the balance Mg and impurities. A preparation method comprises the following steps of (1), material preparing; and (2), cast ingot melting. The cast magnesium matrix composite material with the high strontium and high aluminum content and the preparation method have the beneficial effects that raw materials of the magnesium matrix composite material provided by the invention are all metal and alloy which are relatively cheap, and the cast magnesium matrixcomposite material with the high strontium and high aluminum content and the preparation method have certain cost advantages; a reinforcing body formed by the cast magnesium matrix composite materialwith the high strontium and high aluminum content and the preparation method is an in-situ autogenic reinforcing body and disperses evenly; the content of Sr and Al elements of the cast magnesium matrix composite material is relatively high, eutectic tissue is formed, the composition of eutectic tissue phase is alpha-Mg and Mg17Sr2, Al2Sr and Al4Sr phase, and by means of utilization of the characteristics of the Al2Sr phase having the strong plasticity at the same time and having good interface with a magnesium matrix, the high-performance composite material is prepared; and the cast magnesiummatrix composite material with the high strontium and high aluminum content and the preparation method adopt ordinary casting, the process procedure is simple, the eutectic tissue content and morphology are adjusted and controlled by adjusting and controlling the ingredients, and the performance is further improved.
Description
technical field [0001] The invention belongs to the field of magnesium alloys and magnesium-based composite materials, in particular to a casting magnesium-based composite material with high strontium and high aluminum content and a preparation method. Background technique [0002] In recent years, the energy crisis, resource depletion and environmental degradation have put forward higher requirements for aerospace and automotive industry's lightweight, energy saving and emission reduction and low-carbon environmental protection. Magnesium alloys have attracted increasing attention due to their excellent properties such as low density, high specific strength, and high specific stiffness, and have become an important research direction for metal structural materials in recent years. Most of the relevant research work in the early stage focused on the strength and toughness of magnesium alloys: solid solution strengthening and precipitation strengthening were achieved by addin...
Claims
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