Preparation of lanthanum-containing AE heat resisting die-casting magnesium alloy
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A technology of hot pressing and casting magnesium, which is applied in the field of preparation of lanthanum-containing AE series heat-resistant die-casting magnesium alloys. performance, high temperature performance improvement, and the effect of equalizing strength
Inactive Publication Date: 2009-05-27
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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However, subsequent related reports showed that when the temperature is higher than 150 °C, Al 11 RE 3 phase partially decomposes and leads to Mg 17 Al 12 The formation of the phase makes the structure near the alloy grain boundary unstable during the creep process, which eventually leads to a sharp decline in the creep resistance of the alloy.
In 2005, the new high-temperature creep-resistant die-casting magnesium alloy AE44 developed by Norway Hydro Magnesium Company has been used in the pro
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Embodiment 1
[0013] Weigh aluminum: 3.5%, lanthanum: 1.0%, manganese: 0.2%, the total amount of impurity elements Fe, Cu and Ni is less than 0.03%, and the balance is magnesium. Preheat pure magnesium, aluminum, aluminum-manganese master alloy and magnesium-lanthanum master alloy to 200°C, then put pure magnesium, aluminum, aluminum-manganese master alloy into the crucible preheated to 300°C, and pass through SF 6 :CO 2 The protective gas with a volume ratio of 1:100, when the added charge is completely melted and the melt temperature reaches 720°C, add the magnesium-lanthanum master alloy, and continue to pass the shielding gas, add the magnesium-lanthanum master alloy and melt it, when the temperature rises Stir for 5 minutes at 720°C, then refine with argon for 5 minutes, let stand for 28 minutes after refining, cool the melt to 680°C, and die-cast it on a cold chamber die-casting machine with a clamping force of 280KN to obtain lanthanum-containing AE It is a heat-resistant die-castin...
Embodiment 2
[0015] Weigh aluminum: 4.0%, lanthanum: 2.0%, manganese: 0.3%, the total amount of impurity elements Fe, Cu and Ni is less than 0.03%, and the balance is magnesium. Add magnesium-lanthanum master alloy when the melt temperature reaches 725°C, stir for 8 minutes when the temperature rises to 725°C, then refine with argon gas for 7 minutes, and let stand for 30 minutes after refining. The rest are the same as in Example 1. The properties of the alloy are shown in the table 1 and Table 2.
Embodiment 3
[0017] Weigh aluminum: 4.2%, lanthanum: 4.2%, manganese: 0.4%, the total amount of impurity elements Fe, Cu and Ni is less than 0.03%, and the balance is magnesium. Add magnesium-lanthanum master alloy when the melt temperature reaches 730°C, stir for 10 minutes when the temperature rises to 730°C, then refine with argon gas for 10 minutes, and leave it for 30 minutes after refining. The rest are the same as in Example 1. The properties of the alloy are shown in the table 1. Table 2 and Table 3.
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Abstract
The invention relates to a lanthanum contained AE series heat-resistant die-casting magnesium alloy and a preparation method thereof. The alloy consists of the following compositions by mass percentage: 3.5 to 4.5 percent of Al, 1 to 6 percent of La, 0.2 to 0.6 percent of Mn, and less than 0.03 percent of gross of impurity elements Fe, Cu and Ni, and the balance being magnesium. The method comprises the following steps: preheating pure magnesium, aluminum, aluminum-manganese interalloy and magnesium-lanthanum interalloy to the temperature of 200 DEG C according to a proportion; then, putting the mixture into a crucible which is preheated to the temperature of 300 DEG C, and introducing shield gas with a volume ratio of SF6 to CO2 being 1:100; adding the magnesium-lanthanum interalloy into the crucible after melt reaching a temperature of between 720 and 740 DEG C; continuously introducing the shield gas to stir the melt for 5 to 10 minutes; introducing argon gas to refine the melt for 5 to 10 minutes; and keeping the mixture stand for 28 to 32 minutes to obtain the lanthanum contained AE series heat-resistant die-casting magnesium alloy. The alloy has tensile strength at 200 DEG C of between 119 and 136MPa, yield strength of between 85 and 107MPa, elongation percentage of between 18 and 24 percent, and creep rate under 70MPa at 200 DEG C of 1.17*10<-9>s<-1>.
Description
technical field [0001] The invention belongs to a preparation method of a lanthanum-containing AE series heat-resistant die-casting magnesium alloy. Background technique [0002] Magnesium alloy is the metal structure material with the lowest density in engineering applications. At the same time, magnesium alloy also has the advantages of high specific strength, high damping, electromagnetic shielding, excellent casting, cutting performance and easy recycling. It is used in automobiles, electronics, aviation, aerospace , national defense and other fields have important application value and broad application prospects. Especially in the context of global iron, aluminum, zinc and other metal resources becoming increasingly scarce, environmental protection pressure and energy conservation awareness are increasing, magnesium's resource advantages and performance advantages have been fully utilized, and magnesium alloys have become a rapidly rising engineering material. Two Mg-...
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IPC IPC(8): C22C23/02C22C1/03
Inventor 孟健张景怀唐定骧张德平房大庆王鸿燕杜海鲁化一
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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