A kind of sc-containing high-strength high-toughness magnesium alloy and preparation method thereof
A high-strength, high-toughness, magnesium alloy technology, applied in the field of high-strength, high-toughness magnesium alloys and their preparation, can solve problems such as the inability to increase the distribution density at will, material ductile plastic failure, and the tendency of alloy thermal cracking, etc., to achieve excellent room temperature and high temperature mechanics Performance, plastic index improvement, room temperature mechanical properties improvement effect
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[0050] The present invention also provides a method for preparing a Sc-containing high-strength and high-toughness magnesium alloy, comprising the following steps:
[0051] A) batching pure Mg, Mg-Zr master alloy, Mg-Sc master alloy and Mg-RE master alloy according to the following mass fractions, melting and casting;
[0052] RE = Y, Nd and Gd;
[0053] Y: 4.5~6.5wt%, Nd: 1.5~4.0wt%, Gd: 1.5~4.0wt%, Sc: 0.05~0.5wt%, Zr: 0.15~1.5wt%, the balance is Mg, of which the total amount of rare earth elements Not more than 10wt%
[0054]B) heat-treating or extruding the casting to obtain a high-strength and high-toughness magnesium alloy containing Sc.
[0055] In the present invention, the pure Mg, the Mg-Zr master alloy, the Mg-Sc master alloy and the Mg-RE master alloy are preferably proportioned and then dried. The drying temperature is 100-200° C. and the drying time is 1-2 hours;
[0056] (2) Put the dried pure Mg and Mg-RE master alloy into the crucible and raise the temperat...
Embodiment 1
[0077] The high-strength heat-resistant magnesium alloy in this embodiment is composed of the following components by mass percentage: Y: 4.5wt.%, Nd: 1.5wt%, Gd: 1.5wt%, Sc: 0.05wt%, Zr: 0.5wt%, and The amount is Mg and unavoidable impurities.
[0078] The casting molding preparation of the high-strength heat-resistant magnesium alloy of this embodiment comprises the following steps:
[0079] (1) Align the raw material pure Mg, Mg-Zr master alloy, Mg-RE master alloy, and Mg-Sc master alloy in proportion, and then dry them. The drying temperature is 100-200°C, and the drying time is 1-2 hours. .
[0080] (2) During the preparation process, the melt has been in CO 2 and SF 6 Under the protection of mixed gas, CO 2 with SF 6 The ratio is 99.5:0.5.
[0081] (3) Put the dried pure Mg and Mg-RE master alloy into the crucible and raise the temperature with the furnace until it is completely melted, and the temperature is controlled at 780°C.
[0082] (4) Cool the melt down to...
Embodiment 2
[0088] The difference between Example 2 and Example 1 is that the high-strength heat-resistant magnesium alloy is composed of the following components by mass percentage: Y: 6.5wt.%, Nd: 1.5wt%, Gd: 1.5wt%, Sc: 0.1wt% , Zr: 0.5wt%, and the balance is Mg and unavoidable impurities.
[0089] Solution treatment: heat-treat the casting at 510°C for 12h, then air-cool to room temperature. Aging treatment: heat-treat the casting at 225°C for 48 hours, then air-cool to room temperature.
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