Eutectic carbide reinforced tantalum alloy and preparation method thereof

The invention provides a eutectic carbide reinforced tantalum alloy and a preparation method thereof. According to the tantalum alloy, solid solution strengthening is carried out by adding refractory metal elements Nb, Mo and W, further strengthening is carried out by adding a C element to generate eutectic carbide in situ, the composition is TaaNbbMocWdCe, a, b, c, d and e are atomic percentages corresponding to the elements, a is larger than or equal to 40 and smaller than or equal to 60, b is larger than or equal to 6 and smaller than or equal to 10, c is larger than or equal to 6 and smaller than or equal to 10, d is larger than or equal to 10 and smaller than or equal to 20, e is larger than 0 and smaller than or equal to 20, and a + b + c + d + e = 100. The invention also provides an in-situ preparation method of the eutectic carbide reinforced tantalum alloy. The in-situ preparation method comprises the following steps: accurately weighing blocky Ta, Nb, Mo and W metal raw materials and graphite partic