Processing method of low-cost high-performance tantalum alloy plate

Abstract

The invention discloses a processing method of a low-cost high-performance tantalum alloy plate, which comprises the following steps: taking a firm electrode welded after uniformly mixing and molding Ta powder, W powder and Nb powder as a raw material, and carrying out electron beam melting twice to obtain a large-specification tantalum alloy cast ingot; the method comprises the following steps: carrying out primary extrusion on a large-specification cast ingot, and then carrying out repeated operation of overturning, forging and shaping and secondary extrusion to obtain a tertiary extrusion bar billet; and finally, the extruded bar blank is subjected to blanking, intermediate annealing, cross rolling and finished product annealing, and preparation of the tantalum alloy plate is completed. The novel tantalum alloy is prepared by replacing a part of a Ta matrix with Nb, the cost of raw materials can be reduced by about 1 / 4, then cross extrusion of cast ingots is achieved through multiple times of overturning forging and extrusion, the advantage that crystalline grains are broken through shear deformation and dislocation staggering is fully utilized, the grain size of the prepared plate is 8.0 grade or above, the mechanical property is superior to that of a traditional Ta2.5 W alloy, and the production cost is lowered. And the material can be used as a preferential material for weaponry structural members.

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