Coherent nanophase-reinforced medium-entropy alloy with excellent thermal stability and preparation method of coherent nanophase-reinforced medium-entropy alloy
A technology of thermal stability and entropy alloy, which is applied in the field of excellent thermal stability coherent nano-phase strengthened medium-entropy alloy and its preparation, can solve the problem of low thermal stability of nano-phase, achieve excellent thermal stability of the structure, and facilitate creep and long-lasting, reduced tendency to form effects
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[0029] The preparation method of the entropy alloy in the NiCoCr base of the above-mentioned dual-phase structure comprises the following steps:
[0030] Step 1. Mix 30-33% of Ni, 30-33% of Co, 30-33% of Cr, 5-7% of Al and 1.0-3.0% of Ta metal particles in atomic percentage.
[0031] When the raw materials are weighed, the weight is accurate to 0.01g, and then the alloy is smelted by vacuum arc melting.
[0032] Step 2, vacuum smelting the metal particles obtained in step 1 to form an ingot.
[0033] During the smelting process, the vacuum is first to 3Pa, then high-purity argon gas is introduced, and then the vacuum is evacuated. The furnace cleaning is repeated three times to ensure a high-purity vacuum environment. Melted 5 times to ensure the uniformity of composition, and finally cooled in a water-cooled copper crucible to obtain an ingot;
[0034] Step 3, performing homogenization treatment on the ingot obtained in step 2 at a temperature of 1200-1250 °C;
[0035] Ste...
Embodiment 1
[0039] A method for preparing a medium-entropy alloy strengthened by coherent nano-phase with excellent thermal stability, comprising the following steps:
[0040] Step 1. Mix 31% of Ni, 31% of Co, 30% of Cr, 6% of Al and 2% of Ta metal particles in atomic percentage.
[0041] Step 2, vacuum smelting the metal particles obtained in step 1 to form an ingot.
[0042] During the smelting process, the vacuum is first to 3Pa, then high-purity argon gas is introduced, and then the vacuum is evacuated. The furnace cleaning is repeated three times to ensure a high-purity vacuum environment. The smelting induction current is 450A. The alloy smelting process is accompanied by electromagnetic stirring, and remelting is repeated 5 times. , in order to ensure the uniformity of composition, and finally cooled in a water-cooled copper crucible to obtain an ingot;
[0043] Step 3. Perform 1200°C homogenization treatment on the alloy ingot;
[0044] Step 4. The homogenized alloy is subjected...
Embodiment 2
[0049] A method for preparing a medium-entropy alloy strengthened by coherent nano-phase with excellent thermal stability, comprising the following steps:
[0050] Step 1. Mix 33% of Ni, 30% of Co, 31% of Cr, 5% of Al and 1% of Ta metal particles in atomic percentage.
[0051] Step 2, vacuum smelting the metal particles obtained in step 1 to form an ingot.
[0052] During the smelting process, the vacuum is first to 3Pa, then high-purity argon gas is introduced, and then the vacuum is evacuated, and the furnace is washed three times to ensure a high-purity vacuum environment. , in order to ensure the uniformity of composition, and finally cooled in a water-cooled copper crucible to obtain an ingot;
[0053] Step 3. The alloy ingot is homogenized at 1225°C;
[0054] Step 4. The homogenized alloy is subjected to multi-pass cold rolling at room temperature, and the deformation is controlled at 70%;
[0055] Step 5: Recrystallization of the cold-rolled alloy at 1075° C. for 15 ...
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