Multi-element composite anti-oxidation Ti2AlNb alloy and preparation method thereof

Abstract

The invention provides a multi-element composite anti-oxidation Ti2AlNb alloy and a preparation method thereof. The alloy contains chemical elements by weight percentage: Al: 20%-25%, Nb: 20%-23%, W:0.1%-1.5%, Zr: 1%-3%, Si: 0.1%-1%, Ta: 0.1%-2%, W + Zr + Si + Ta: 1.5%-7.5%, and the balance of Ti. The preparation method comprises courses of alloy proportioning, smelting, cogging and forging, wherein a method for arranging a piezoelectric electrode on an alloy with high-melting-point alloy elements in a distributed manner is used for alloy proportioning; a three-vacuum self-consumption smelting technology is used for the smelting process; a method of homogenizing thermal treatment + extrusion clogging is used for the clogging process; and multi-phase area alternate forging method is adopted for the forging process. According to the invention, alloy elements such as W, Zr, Si and Ta are added in a Ti-Al-Nb system; the smelting and forging technologies with alloy composition homogenization and organizational homogenization are combined; high-temperature oxidation resistance of the Ti2AlNb alloy is enhanced obviously; and high-strength mechanical performance is improved.

Description

technical field [0001] The invention is a multi-element composite antioxidant Ti 2 An AlNb alloy and a preparation method thereof belong to the field of high-temperature titanium alloy materials. Background technique [0002] With the increasing application and service requirements of new aero-engines for high-temperature titanium alloy materials, titanium alloy materials with higher high-temperature mechanical properties and oxidation resistance are urgently needed to be developed. Due to the limitation of high temperature stability and oxidation resistance of traditional high-temperature titanium alloy materials, it is difficult to make a breakthrough in its long-term stable use temperature between 600°C and 650°C. O Phase Ti as One of Ti-Al-Nb Alloy System 2 Due to its low density, high specific strength, and excellent high-temperature mechanical properties, AlNb alloys can meet the high-standard service requirements of new aero-engines, and are one of the important mat...

AI Technical Summary

Problems solved by technology

In the process of anti-oxidation research on Ti-Al-Nb alloy system, it is found that when the Nb content is in the range of 10% to 13%, its comprehensive anti-oxidation performance is the best. With the further increase of Nb content, the high-Nb alloy high temperature oxidation Nb produced when 2 o 5 Insufficient oxide film protection ability, causing Ti 2 The reduction of oxidation resistance of AlNb alloy, while for Ti 2 AlNb alloys generally require more than 20% Nb content to ensure their plasticity and processing properties

In the Ti-Al-Nb alloy system, there are also studies on the development of adding V, Si, Ta and other alloying elements to optimize the oxidation resistance and comprehensive mechanical properties. Some alloying elements play an active role in improving the oxidation resistance and comprehensive mechanical properties. , but limited by the addition content and cost of a single alloy element in the Ti-Al-Nb alloy system, it is difficult to use a single alloy composition optimization design in the Ti-Al-Nb alloy system to meet its higher comprehensive requirements. Requirements for the development of mechanical properties