Magnesium alloy with high strength, super toughness and low density and preparation method thereof
A magnesium alloy and low-density technology, applied in the field of high-strength, ultra-high toughness, low-density, and ultra-light magnesium alloys, can solve the problems of poor strength, poor toughness, and low plasticity of magnesium alloys
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Embodiment 1
[0016] The high-strength, super-tough, low-density ultra-light magnesium alloy of the present invention is composed of: Li: 8%, Zn: 5%, Y: 2%, controlled impurity elements Fe<0.005%, Cu<0.002%, Ni< 0.002%, the rest is Mg. Alloy melting takes place in a vacuum resistance furnace. First, the surface of each metal ingot is decontaminated and placed in a crucible, then the vacuum resistance furnace is evacuated and filled with argon gas, repeated 3 times, and finally filled with argon gas to 1 atm, and the heating and melting process is carried out under the protection of argon gas. The metal melt is stirred with argon gas for 10 minutes, and poured into a water-cooled copper mold at 720° C. to obtain a cast magnesium alloy ingot. The obtained cast magnesium alloy ingot is subjected to heat treatment at 300° C. under the condition of argon protection, and then the magnesium alloy ingot is extruded at 300° C. to form a material.
[0017] Tensile performance tests were carried out...
Embodiment 2
[0019] The high-strength, super-tough, low-density ultra-light magnesium alloy of the present invention is composed of: Li: 8.5%, Zn: 4%, Y: 4.5%, Nd: 1%, and the impurity elements Fe<0.005%, Cu< 0.002%, Ni<0.002%, and the rest is Mg. Alloy melting takes place in a vacuum resistance furnace. First, the surface of each metal ingot is decontaminated and placed in a crucible, then the vacuum resistance furnace is evacuated and filled with argon gas, repeated 3 times, and finally filled with argon gas to 1 atm, and the heating and melting process is carried out under the protection of argon gas. The metal melt is stirred with argon gas for 5 minutes, and poured into a water-cooled copper mold at 740° C. to obtain a cast magnesium alloy ingot. The obtained cast magnesium alloy ingot is heat-treated at 355° C. under argon protection, and then extruded at 150° C. to form a 2 mm plate.
[0020] Tensile performance tests were carried out on a room temperature electronic universal tes...
Embodiment 3
[0022] The high-strength, super-tough, low-density ultra-light magnesium alloy of the present invention is composed of: Li: 6.5%, Zn: 2%, Y: 5%, Nd: 1%, and control impurity elements Fe < 0.005%, Cu < 0.002%, Ni<0.002%, and the rest is Mg. The conditions for obtaining cast magnesium alloy ingots by melting and casting are the same as in Example 1. The obtained cast magnesium alloy ingot is heat-treated at 400° C. under the protection of argon, and then extruded at 200° C. to form a plate of 1 mm.
[0023] Tensile performance tests were carried out on a room temperature electronic universal testing machine and a temperature-controlled electronic universal testing machine. The obtained magnesium alloy has tensile strength: 261MPa, yield strength: 224MPa, elongation: 24%, density: 1.59g / cm at room temperature 3 ; At 120°C, tensile strength: 198MPa, yield strength: 157MPa, elongation: 36%.
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