Low-density plastic refractory multi-principal-element alloy and preparation method thereof
A multi-principal alloy, low-density technology, applied in the field of metal materials, can solve the problems of inability to meet the application requirements of structural materials, high density and ductile-brittle transition temperature, inability to solve, etc., to improve the solid solution strengthening effect and excellent specific strength. , Improve the effect of room temperature and high temperature strength
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[0034] The present invention proposes a low-density plastic refractory Nb x Ti y Al z V 10 (TaHfMoW) 90-(x+y+z) A method for preparing a multi-principal alloy, comprising the steps of:
[0035] (1) Preparation of Ti / Al / V master alloy balls: weigh according to the preset composition ratio, place titanium raw materials, aluminum raw materials and vanadium raw materials in a crucible, and use vacuum arc melting, firstly pump the vacuum chamber to 10 -4 ~10 -3 Pa, then filled with high-purity argon (volume purity 99.999%), until the vacuum gauge shows 2 × 10 4 ~4×10 4 Pa. Alloy smelting current is 300-400A, smelting for 2-5 minutes each time, after each smelting, turn over the alloy and smelt again, repeat at least 3 times until the alloy composition is uniform, and Ti / Al / V intermediate alloy balls with smooth surface are obtained. 2 ~ 4cm;
[0036] (2) Preparation of Nb / Ta / Hf / Mo / W master alloy balls: weigh according to the preset distribution ratio, put niobium raw mater...
Embodiment 1
[0042] This embodiment proposes the preparation method of NbTiAl-1 multi-principal alloy, weighing according to the preset composition distribution ratio, respectively weighing raw materials Nb: 48.68g, Ti: 15.68g, Al: 5.30g, V: 6.68g, Ta: 11.85g, Hf:7.01g, W:4.83g, wherein all raw materials are industrial-grade purity; The specific steps of the method are as follows:
[0043] (1) Preparation of Ti / Al / V intermediate alloy balls: 15.68g titanium, 5.30g aluminum and 6.68g vanadium were placed in a crucible, and vacuum arc melting was used, and the vacuum chamber was first pumped to 10 -4 Pa, then filled with high-purity argon (volume purity 99.999%), until the vacuum gauge shows 4 × 10 4 Pa. Alloy smelting current is 350A, smelting for 3 minutes each time, after each smelting, turn over the alloy and smelt again, repeat 5 times until the alloy composition is uniform, and after cooling in the crucible, Ti / Al / V intermediate alloy balls with smooth surface are obtained. 2 ~ 4cm; ...
Embodiment 2
[0049] This embodiment proposes the preparation method of NbTiAl-2 multi-principal alloy, weighs according to the preset composition distribution ratio, and weighs the raw materials Nb: 46.63g, Ti: 15.02g, Al: 3.39g, V: 6.39g, Ta: 11.35g, Hf:11.20g, Mo:6.02g, wherein all raw materials are industrial grade purity; The method concrete steps are as follows:
[0050] (1) Preparation of Ti / Al / V master alloy balls: 15.02g of titanium, 3.39g of aluminum and 6.39g of vanadium were placed in a crucible and melted by vacuum arc. First, the vacuum chamber was pre-pumped to 10 -3 Pa, then filled with high-purity argon (volume purity 99.999%), until the vacuum gauge shows 4 × 10 4 Pa. Alloy smelting current is 350A, smelting for 3 minutes each time, after each smelting, the alloy is turned over and smelted again, and repeated 6 times until the alloy composition is uniform, and after cooling in the crucible, Ti / Al / V intermediate alloy balls with smooth surface are obtained. 2 ~ 4cm;
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