High tenacity casting magnesium alloy
A technology for casting magnesium alloys with high strength and toughness, which is applied in the field of casting magnesium alloy materials and can solve the problems of increasing the production cost of alloys and adding a large amount of rare earth elements.
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Embodiment 1
[0007] Example 1: The chemical composition of the magnesium alloy is shown in Table 1 below,
[0008] The chemical composition (mass fraction, %) of magnesium alloy in table 1 embodiment 1
[0009]
[0010] on SO 2 Melting in an atmosphere-protected crucible furnace and casting in a metal mold. X-ray diffraction phase analysis and microstructure observation show that the β phase with a large content and small size is obtained, and contains a certain amount of Al 2 Ca, Mg 2 Ca, YAl 3 Equiphase, the microstructure of the alloy is similar to the eutectic structure in the iron-carbon alloy.
[0011] Its room temperature performance (20°C) reaches: tensile strength 210-230MPa, yield strength 140-170MPa, elongation 4.5-5.5%; high temperature 150°C performance reaches: tensile strength 160-180MPa, yield strength 110-130MPa, elongation The elongation rate is 14-16%.
Embodiment 2
[0012] Embodiment 2: The chemical composition of the magnesium alloy is shown in Table 2 below,
[0013] The chemical composition (mass fraction, %) of magnesium alloy in table 2 embodiment 2
[0014]
[0015] The smelting, casting, phase analysis and microstructure observation methods are the same as in Example 1, and the β phase with more content and smaller size than in Example 1 is obtained, and it contains more Al than in Example 1. 2 Ca, Mg 2 Ca, YAl 3 There are more phases, and the microstructure of the alloy is closer to the eutectic structure in the iron-carbon alloy.
[0016] Its room temperature performance (20°C) reaches: tensile strength 220-250MPa, yield strength 150-170MPa, elongation 5.0-5.5%; high temperature 150°C performance reaches: tensile strength 160-190MPa, yield strength 120-145MPa, elongation The growth rate is 15-18%.
Embodiment 3
[0017] Embodiment 3: The chemical composition of the magnesium alloy is shown in Table 3 below,
[0018] The chemical composition (mass fraction, %) of magnesium alloy in table 2 embodiment 2
[0019]
[0020] The smelting, casting, phase analysis and microstructure observation methods are the same as in Example 1, and the β phase with more content and smaller size than in Example 1 is obtained, and it contains more Al than in Example 1. 2 Ca, Mg 2 Ca, YAl 3 There are many other phases; and its β phase, Al 2 Ca, Mg 2 Ca, YAl 3 Content is slightly more than in Example 2.
[0021] Its room temperature performance (20°C) reaches: tensile strength 220-250MPa, yield strength 150-180MPa, elongation 5-6%; high temperature 150°C performance reaches: tensile strength 170-200MPa, yield strength 120-150MPa, elongation The growth rate is 15-17%.
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Abstract
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