High-creep-resistance magnesium-scandium-based alloy and preparation method thereof
A base alloy and creep technology, which is applied in the field of creep-resistant magnesium-scandium-based alloys and their preparation, can solve the problems of high phase melting point, reduced elongation and creep resistance, and achieve high elongation and improved creep performance , a wide range of effects
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Embodiment 1
[0024] Get Sc: 500g, Mn: 150g, Sr: 30g, Ba: 30g, Mg9290g, the raw materials are all 99.5% pure metal ingots, after the above-mentioned raw materials are all added, stir for 30 minutes, in sulfur hexafluoride and argon 1: Melting under the protection of 19 mixed gas, the melting temperature is 680 ° C, pouring into the steel mold at 650 ° C, the steel mold is fully preheated at 500 ° C, after pouring, keep it in the furnace at 650 ° C for 30 minutes, and then cool it to room temperature with water. The above smelted alloy was solution treated at 0.7 Tm under nitrogen protection for 6 hours, and then cooled in warm water at 60°C. The alloy after solid solution was aged at 0.1Tm and 30MPa for 24 hours. After aging, the alloy was cooled to room temperature to prepare Mg-5Sc-1.5Mn-0.3Sr-0.3Ba alloy. Such as figure 2 As shown, the precipitates in the obtained alloy are uniform and distributed in the interior of the grains and near the grain boundaries, which is conducive to pinnin...
Embodiment 2
[0026] Take Sc: 50g, Mn: 10g, Sr: 50g, Mg9890g, the raw materials are all 99.5% pure metal ingots, after the above raw materials are added, stir for 30 minutes, under the protection of a mixed gas of sulfur hexafluoride and argon at 1:19 The melting temperature is 800°C and poured into the steel mold at 770°C. The steel mold is fully preheated at 600°C. After pouring, it is kept in a furnace at 750°C for 120 minutes, and then cooled to room temperature with water. The above smelted alloy was solid solution treated at 0.85 Tm under the condition of nitrogen protection for 6 hours, and then cooled in warm water at 60°C. The alloy after solid solution was aged at 0.2Tm and 80MPa for 2 hours. After the aging was completed, the alloy was cooled to room temperature to prepare Mg-5Sc-1.5Mn-0.3Sr-0.3Ba alloy.
[0027] Such as image 3 As shown, the Mg-0.5Sc-0.1Mn-0.5Sr alloy in this example has a wider platform and more stable creep performance at 30MPa and 300 °C than the traditiona...
Embodiment 3
[0029] Take Sc: 300g, Mn: 100g, Sr: 300g, Mg 9300g, the raw materials are all 99.5% pure metal ingots, after the above raw materials are added, stir for 30 minutes, in the mixed gas of sulfur hexafluoride and argon 1:19 Melting under protection, the melting temperature is 750°C, pouring into the steel mold at 720°C, the steel mold is fully preheated at 570°C, after pouring, it is kept in a furnace at 700°C for 60 minutes, and then cooled to room temperature with water. The above smelted alloy was solution treated at 0.8 Tm under nitrogen protection for 18 hours, and then cooled in warm water at 60°C. The alloy after solid solution was aged at 0.1 Tm and 35 MPa for 18 hours. After the aging was completed, the alloy was cooled to room temperature to prepare Mg-3Sc-1Mn-3Sr alloy.
[0030] Such as Figure 4 As shown, compared with the creep rate of the second stage of the WE43 alloy, the creep resistance rate of the Mg-3Sc-1Mn-3Sr alloy of this embodiment is more than 10 times th...
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