Ni-Si-Fe high-temperature alloy and preparation method thereof

The invention relates to a Ni-Si-Fe high-temperature alloy, which comprises the following components in atomic percent: 82 to 85 percent of Ni, 12 to 14 percent of Si and 2 to 4 percent of Fe. The microstructure of the Ni-Si-Fe high-temperature alloy is composed of a gamma matrix, a gamma precipitated phase precipitated from the gamma matrix and gamma particles precipitated from the gamma precipitated phase, and the gamma particles are round. According to the preparation method of the Ni-Si-Fe high-temperature alloy, the alloy is obtained through single crystal casting, homogenizing annealing, pre-aging treatment and aging treatment, and compared with an existing high-temperature alloy of a gamma/gamma coherent structure, the alloy can have better mechanical properties due to the layered microstructure of the gamma matrix/gamma precipitated phase/gamma particles, and the Ni-Si-Fe high-temperature alloy can be used for preparing the high-temperature alloy. The gamma particles can improve the shearing resistanc