Aluminum-free high-strength heat-resistant die-casting magnesium alloy and preparation method thereof
A high-strength, heat-resistant and pressure-resistant technology, applied in the field of metal materials, can solve problems such as limited weight ratio, achieve low shrinkage and porosity tendency, refine casting structure, and good die-casting performance.
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[0012] Example 1
[0013] Preheat the pure magnesium ingot, pure Gd, pure GdY, Mg-Zr master alloy and pure Zn to 150~200℃ and have 0.01~0.03% SF 6 And the margin is N 2 The mixed gas protects the melting furnace. First put the pure magnesium ingot into the melting furnace, after it is completely melted, raise the melt temperature to 720℃, and then directly add the preheated pure Gd, pure GdY, Mg-Zr master alloy and pure Zn into the melt After stirring twice, make it evenly mixed, let it stand for 10 minutes, then lower the temperature to 680°C, remove the scum on the surface, and perform die-casting. During die-casting, the injection speed is 2.4m / s, the pouring temperature is 710℃, and the initial temperature of the mold is 200℃.
[0014] The obtained casting composition is shown in the following table (by mass percentage):
[0015] Gd
[0016] will
[0017] The alloy is die-casted into tensile specimens, and the measured tensile properties at room temperature are:
[0...
Example Embodiment
[0023] Example 2
[0024] Preheat the pure magnesium ingot, pure Gd, pure GdY, Mg-Zr master alloy and pure Zn to 150~200℃ and have 0.01~0.03% SF 6 And the margin is N 2 The mixed gas protects the melting furnace. First put the pure magnesium ingot into the melting furnace, after it is completely melted, raise the melt temperature to 720℃, and then directly add the preheated pure Gd, pure GdY, Mg-Zr master alloy and pure Zn into the melt After stirring twice, make it evenly mixed, let it stand for 10 minutes, then lower the temperature to 680°C, remove the scum on the surface, and perform die-casting. During die-casting, the injection speed is 2.4m / s, the pouring temperature is 710℃, and the initial temperature of the mold is 200℃.
[0025] The obtained casting composition is shown in the following table (by mass percentage):
[0026] Gd
[0027] The alloy is die-casted into tensile specimens, and the measured tensile properties at room temperature are:
[0028] σ b =270M...
Example Embodiment
[0033] Example 3
[0034] Preheat the pure magnesium ingot, pure Gd, pure GdY, Mg-Zr master alloy and pure Zn to 150~200℃ and have 0.01~0.03% SF 6 And the margin is N 2 The mixed gas protects the melting furnace. First put the pure magnesium ingot into the melting furnace, after it is completely melted, raise the melt temperature to 720℃, and then directly add the preheated pure Gd, pure GdY, Mg-Zr master alloy and pure Zn into the melt After stirring twice, make it evenly mixed, let it stand for 10 minutes, then lower the temperature to 680°C, remove the scum on the surface, and perform die-casting. During die-casting, the injection speed is 2.4m / s, the pouring temperature is 710℃, and the initial temperature of the mold is 200℃.
[0035] The obtained casting composition is shown in the following table (by mass percentage):
[0036] Gd
[0037] The alloy is die-casted into tensile specimens, and the measured tensile properties at room temperature are:
[0038] σ b =272M...
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