Preparation method of near-eutectic nb-si-mo alloy with lamellar structure orientation arrangement characteristics

Abstract

The invention belongs to the technical field of preparation of high-temperature structural materials, and relates to a method for preparing a near-eutectic Nb-Si-Mo alloy with the characteristics of directional arrangement of lamellar structures. The invention adopts powder-feeding laser rapid prototyping technology to prepare near-eutectic Nb-Si-Mo alloy with the characteristics of fine lamellar directional arrangement structure, and uses commercially available pure element powder as raw material, without special preparation of spherical powder or pre-alloyed powder , The raw material preparation process is simple. The alloy consists of Nb solid solution phase and β‑Nb 5 Si 3 Composed of two phases, lamellar Nb solid solution phase and lamellar β-Nb with a size of about 100-500nm 5 Si 3 Phases are arranged alternately, and all lamellar Nb solid solution phases and lamellar β-Nb 5 Si 3 The phases are arranged approximately in the same direction. Compared with the Nb-Si-Mo eutectic alloy prepared by the traditional directional solidification process and magnetron sputtering process, the present invention is based on the characteristics of laser rapid melting and solidification, and can obtain a finer lamellar structure, making the near-eutectic composition The Nb-Si-Mo alloy of the present invention can also realize the full eutecticization of the microstructure.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-temperature structural materials, and relates to a method for preparing a near-eutectic Nb-Si-Mo alloy with lamellar structure orientation arrangement characteristics. Background technique [0002] In order to meet the development needs of high thrust ratio aeroengine blades, research on new ultra-high temperature structural materials with a temperature bearing capacity exceeding 1200 °C is one of the current research hotspots in the field of materials. As a next-generation high-temperature structural material, Nb-Si-based alloys show attractive application prospects and have attracted widespread attention. They are considered to be the most promising new-generation ultra-high-temperature structural materials that can replace the existing nickel-based superalloys in the short term. [0003] Processes and alloying elements will have a significant impact on the microstructure of Nb-Si-ba...

AI Technical Summary

Problems solved by technology

The preparation of layered gold by physical vapor deposition requires alternate deposition of Nb and Si. The preparation process is complicated and the structure is very coarse. The thickness of a single layer of Nb or Nb5Si3 is about 0.1-0.5mm. In addition, there may be some metastable phases in the alloy. , which affects the stability of the material structure, requires subsequent treatment to completely eliminate