A kind of ultra-high strength nanocrystalline al-mg aluminum alloy material and preparation method thereof
An aluminum alloy material and nanocrystalline technology, which is applied in the field of ultra-high strength nanocrystalline Al-Mg aluminum alloy material and its preparation, can solve the problems of low strength and low manufacturing cost, and achieve the goal of increasing strength, reducing energy consumption, and reducing costs Effect
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Embodiment 1
[0051] Cast the Al-6.0Mg aluminum alloy into a circular billet with a diameter of 50mm, and process it into a disc with a size of Φ20×2mm by turning. The disc is homogenized at 450°C×2h in a circulating air resistance furnace , and then perform high-pressure torsion on the homogenized disc, the process of high-pressure torsion is: torsion 10 circles under the process conditions of room temperature, pressure 6GPa, and rotational speed 1r / min. The aluminum alloys twisted under high pressure at room temperature were then subjected to the average grain size determination, hardness measurement and tensile test.
[0052] The test results of the above-mentioned Al-6.0Mg aluminum alloy twisted at room temperature and high pressure for 10 turns are shown in Table 2 and Figure 5 , the average grain size of the prepared alloy is d TEM is 68nm, the hardness HV is 2061MPa, and the tensile strength σ b 845MPa, yield strength σ 0.2 It is 845MPa.
Embodiment 2
[0057] Cast the Al-8.0Mg aluminum alloy into a circular billet with a diameter of 50mm, and process it into a disc with a size of Φ20×2mm by turning. The disc is homogenized at 450°C×2h in a circulating air resistance furnace , and then perform high-pressure torsion on the homogenized disc, the process of high-pressure torsion is: torsion 10 circles under the process conditions of room temperature, pressure 6GPa, and rotational speed 1r / min. The aluminum alloys twisted under high pressure at room temperature were then subjected to the average grain size determination, hardness measurement and tensile test.
[0058] The test results of the above-mentioned Al-8.0Mg aluminum alloy twisted at room temperature and high pressure for 10 turns are shown in Table 2 and Figure 6 , the average grain size of the prepared alloy is d TEM 65nm, hardness HV is 2141MPa, tensile strength σ b 855MPa, yield strength σ 0.2 It is 830MPa.
Embodiment 3
[0063] Cast the Al-10.0Mg aluminum alloy into a circular billet with a diameter of 50mm, and process it into a disc with a size of Φ20×2mm by turning. The disc is homogenized at 450°C×2h in a circulating air resistance furnace , and then perform high-pressure torsion on the homogenized disc, the process of high-pressure torsion is: torsion 10 circles under the process conditions of room temperature, pressure 6GPa, and rotational speed 1r / min. The aluminum alloys twisted under high pressure at room temperature were then subjected to the average grain size determination, hardness measurement and tensile test.
[0064] The test results of the above-mentioned Al-10.0Mg aluminum alloy twisted at room temperature and high pressure for 10 turns are shown in Table 2 and Figure 7 , the average grain size of the prepared alloy is d TEM is 57nm, the hardness HV is 2396MPa, and the tensile strength σ b 795MPa, yield strength σ 0.2 It is 795MPa.
[0065] The average grain size and mec...
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