High toughness and high entropy alloy with gradient grain structure and preparation method thereof
A high-entropy alloy and grain structure technology, which is applied in the fields of high-strength and toughness high-entropy alloys and rolling heat treatment technology, can solve the problems of poor matching of strength and toughness of high-entropy alloys, and achieve high-strength plastic matching, good plasticity, and simple preparation process. Effect
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[0033] Example 1
[0034] The pure metal is ultrasonically cleaned with alcohol for 5 minutes to remove dust and oil stains on the toilet surface, and then dried with a hair dryer;
[0035] According to the stated atomic percentage, pure Co, pure Cr, pure Fe and pure Ni (purity ≥99.5%) are stacked in the melting furnace from bottom to top in the order of melting point, and the vacuum degree is equal to 10 -3 When it is MPa, it is filled with argon gas, arc melting is performed at a high temperature of 1200°C and magnetic field stirring for 25 minutes, and then naturally cooled to obtain an alloy ingot;
[0036] Repeat the above "arc smelting-natural cooling" process (that is, the same temperature and time) 4 times to obtain as-cast samples with relatively uniform composition;
[0037] Place the obtained as-cast sample in a resistance furnace, hold at 1200°C for 4 hours, and take out water quenching;
[0038] Use wire cutting technology to cut the obtained solution-treated sample into 3m...
Example Embodiment
[0040] Example 2
[0041] The pure metal is ultrasonically cleaned with alcohol for 5 minutes to remove dust and oil stains on the toilet surface, and then dried with a hair dryer;
[0042] According to the stated atomic percentage, pure Co, pure Cr, pure Fe and pure Ni (purity ≥99.5%) are stacked in the melting furnace from bottom to top in the order of melting point, and the vacuum degree is equal to 10 -3 When it is MPa, it is filled with argon gas, arc melting is performed at a high temperature of 1200°C and magnetic field stirring for 25 minutes, and then naturally cooled to obtain an alloy ingot;
[0043] Repeat the above "arc smelting-natural cooling" process (that is, the same temperature and time) 5 times to obtain as-cast samples with relatively uniform composition;
[0044] Place the obtained as-cast sample in a resistance furnace, hold at 1200°C for 4 hours, and take out water quenching;
[0045] Use wire cutting technology to cut the obtained solution-treated sample into 3m...
Example Embodiment
[0047] Example 3
[0048] The pure metal is ultrasonically cleaned with alcohol for 5 minutes to remove dust and oil stains on the toilet surface, and then dried with a hair dryer;
[0049] According to the stated atomic percentage, pure Co, pure Cr, pure Fe and pure Ni (purity ≥99.5%) are stacked in the melting furnace from bottom to top in the order of melting point, and the vacuum degree is equal to 10 -3 When it is MPa, it is filled with argon gas, arc melting is performed at a high temperature of 1200°C and magnetic field stirring for 25 minutes, and then naturally cooled to obtain an alloy ingot;
[0050] Repeat the above "arc smelting-natural cooling" process (that is, the same temperature and time) 4 times to obtain as-cast samples with relatively uniform composition;
[0051] Place the obtained as-cast sample in a resistance furnace, hold at 1200°C for 4 hours, and take out water quenching;
[0052] Use wire cutting technology to cut the obtained solution-treated sample into 3m...
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