Quasicrystal reinforced magnesium alloy and semisolid preparation method thereof
A technology for strengthening magnesium alloys and quasicrystals, which is applied in the field of quasicrystal reinforced magnesium alloys and their semi-solid preparation, can solve the problems of unsuitable magnesium alloy parts preparation and industrial production, etc., and achieves improved comprehensive mechanical properties, simple process and finished products. high rate effect
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[0024] Example 1
[0025] Alloy composition (mass percent): 84.6% Mg, 7.5% Zn, 1.7% Y, 6.2% Al.
[0026] Put pure Mg, Al, Zn and Mg-Y master alloy in the crucible according to the above composition ratio and heat, and start to pass CO from 420℃ 2 +SF 6 Mix the protective gas, when the melt temperature rises to 730 °C, refine and stand for 15 minutes, and cast it into an alloy ingot at 700 °C; its as-cast microstructure includes α-Mg, I-Phase (quasicrystalline phase), Mg 17 Al 12 , Al 2 Y, such as figure 1 As shown, among them, the volume ratio of I-Phase is 4.1%;
[0027] The above alloy ingot is extruded into a bar after being kept at 390°C for 2 hours, the extrusion cylinder temperature is 410°C, the die temperature is 350°C, and the extrusion ratio is 13;
[0028] The extruded bar was heated to 420°C with a power of 10Kw by an electromagnetic induction heating device, and the power was reduced to 5Kw and continued to be heated to 560°C for semi-solid die-casting.
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Example Embodiment
[0030] Example 2
[0031] Alloy composition (mass percentage): 78% Mg, 13% Zn, 3.3% Y, 5.7% Al.
[0032] The pure Mg, Al, Zn and Mg-Y master alloys are placed in the crucible according to the above-mentioned composition design ratio and heated, and CO is introduced from 420 ℃ 2 +SF 6 Mixed gas protection, when the melt temperature rises to 730 ℃, refining and standing for 15 minutes, cast into alloy ingots at 700 ℃; its as-cast microstructure includes α-Mg, I-Phase (quasicrystalline phase), Mg 17 Al 12 , Al 2 Y, such as figure 2 As shown, among them, the volume ratio of I-Phase is 8.3%;
[0033] The alloy ingot is extruded into a bar after being kept at 390°C for 2 hours, the extrusion cylinder temperature is 410°C, the die temperature is 350°C, and the extrusion ratio is 13;
[0034] The extruded bar was heated to 420°C with a power of 10Kw by an electromagnetic induction heating device, and the power was reduced to 5Kw and continued to be heated to 560°C for semi-sol...
Example Embodiment
[0036] Example 3
[0037] Alloy composition (mass percentage): 71% Mg, 19% Zn, 4.5% Y, 5.5% Al.
[0038] The pure Mg, Al, Zn and Mg-Y master alloys are placed in the crucible according to the above-mentioned composition design ratio and heated, and CO is introduced from 420 ℃ 2 +SF 6 Mixed gas protection, when the melt temperature rises to 730 ℃, refining and standing for 15 minutes, cast into alloy ingots at 700 ℃; its as-cast microstructure includes α-Mg, I-Phase (quasicrystalline phase), Mg 17 Al 12 , Al 2 Y, such as image 3 As shown, among them, the volume ratio of I-Phase is 11.8%;
[0039] The alloy ingot is extruded into a bar after being kept at 390°C for 2 hours, the extrusion cylinder temperature is 410°C, the die temperature is 350°C, and the extrusion ratio is 13;
[0040] The extruded bar was heated to 420°C with a power of 10Kw by an electromagnetic induction heating device, and the power was reduced to 5Kw and continued to be heated to 560°C for semi-sol...
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