Light-heavy rare-earth composite reinforced heat-resistant magnesium alloy and preparation method thereof
A technology of light and heavy rare earth and magnesium alloy, which is applied in the field of light and heavy rare earth composite strengthening heat-resistant magnesium alloy and its preparation, can solve the problems of poor high temperature mechanical properties of magnesium alloy, achieve good thermal stability, refine grains, and improve plasticity. Effect
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[0046] The preparation method of the light and heavy rare earth composite reinforced heat-resistant magnesium alloy of the present invention has the following steps:
[0047] Step 1: Melting magnesium source, zinc source, gadolinium source, cerium source and zirconium source to obtain alloy liquid;
[0048] Step 2: Cool the alloy liquid and pour it into the mold to obtain a casting;
[0049] Step 3: Extruding the casting to obtain the light and heavy rare earth composite reinforced heat-resistant magnesium alloy.
[0050] In the present invention, the types and sources of the magnesium source, zinc source, gadolinium source, cerium source and zirconium source are not particularly limited, and magnesium, zinc, gadolinium, cerium and zirconium sources well known to those skilled in the art can be used. Generally, the magnesium source is magnesium ingots, preferably pure magnesium ingots containing 99.9wt% or more of magnesium; the zinc source is zinc ingots, preferably pure zinc ingots ...
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[0081] Example 1
[0082] Light and heavy rare earth composite reinforced heat-resistant magnesium alloy, the composition is: Gd 8.0wt%, Ce 0.5wt%, Zn 1.2wt%, Zr0.5wt%, the balance is Mg and inevitable impurity elements.
[0083] Preparation of the above-mentioned light and heavy rare earth composite reinforced heat-resistant magnesium alloy:
[0084] Step 1. Combine the magnesium ingot, zinc ingot, gadolinium source (magnesium-gadolinium master alloy ingot containing 20% gadolinium), cerium source (magnesium-cerium master alloy ingot containing 20% cerium) and zirconium source (magnesium-zirconium containing 30% zirconium) Master alloy ingot) remove the oxide layer, prepare the material according to the proportion, and then preheat it to 250°C.
[0085] Step 2: When the crucible is heated to 550°C, the magnesium ingot is added under the condition of passing protective gas. After the magnesium ingot is melted, the temperature is raised to 730°C, zinc ingot, gadolinium source and c...
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[0092] Example 2
[0093] Light and heavy rare earth composite reinforced heat-resistant magnesium alloy, the composition is: Gd 8.5wt%, Ce 1wt%, Zn 1.2wt%, Zr0.5wt%, the balance is Mg and inevitable impurity elements.
[0094] Preparation of light and heavy rare earth composite strengthening heat-resistant magnesium alloy:
[0095] Step 1. Combine the magnesium ingot, zinc ingot, gadolinium source (magnesium-gadolinium master alloy ingot containing 20% gadolinium), cerium source (magnesium-cerium master alloy ingot containing 20% cerium) and zirconium source (magnesium-zirconium containing 30% zirconium) Master alloy ingot) remove the oxide layer, prepare the material according to the proportion, and then preheat it to 250°C.
[0096] Step 2. When the crucible is heated to 545°C, add magnesium ingot under the condition of passing protective gas. After the magnesium ingot is melted, the temperature is raised to 740°C, and zinc ingot, gadolinium source and cerium source are added. ...
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