Composite heat-resisting enhance titanium alloy

Abstract

A composite enhanced heat-resisting titanium-alloy consists of Al 3-8%, Sn 1-6%, Zr 1-6%, Mo 0.5-2%, Nb 0.5-1.5%, Si 0.1-0.8%, La 0.3-1%, B 0.1-0.5% and Ti residue. It has excellent heat, creep resistances and thermal stability at 650-700 degree. It can be used for aviation and aerospace.

Description

technical field [0001] The invention relates to a titanium alloy in the technical field of metal materials, in particular to a composite strengthened heat-resistant titanium alloy. Background technique [0002] High-temperature titanium alloys are mainly used in aerospace, aviation and other fields that require high temperature resistance. For example, aero-engines have strict requirements on high-temperature titanium alloys, which require materials to have good matching of room temperature performance, high temperature strength, creep performance, thermal stability, fatigue performance and fracture toughness. The improvement of engine performance largely depends on the improvement of high-temperature performance of materials, and engine design engineers have higher and higher requirements for the performance of high-temperature titanium alloys. IMI834 (UK), Ti-1100 (USA), BT36 (Russia) and other alloys have been used as 600°C titanium alloys in the aerospace field. my coun...

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Problems solved by technology

[0003] According to the literature search, Mao Xiaonan et al. wrote the article "Properties and Microstructure Characteristics of TP_650 Particle Reinforced Titanium Matrix Composites" in "Rare Metal Materials and Engineering", June 2004, Volume 33, No. 6, 620-623, TP650 alloy is expected to become a 650°C titanium alloy, which has the characteristics of easy processing, low cost, stable interface, heat resistance, corrosion resistance, and wear resistance, but its strength at 700°C is only equivalent to that of IMI834 and Ti1100 at 650°C. Thermal temperature cannot be increased further

Ti 3 Al-based intermetallic compounds, which are characterized by high specific strength, high specific modulus and resistance to combustion, but low room temperature plasticity and fracture toughness

However, compared with the 600°C high-temperature titanium alloys that have been practically used abroad, there is still a gap between the comprehensive performance of the domestic 600°C high-temperature titanium alloys and foreign countries, and it cannot meet the needs of the national aerospace and aviation fields.

The thermal stability of titanium alloys between 600°C and 700°C is mainly related to the brittle phase Ti 3 The precipitation of X (X=Al, Ge, In, Sn, etc.), and the usual method of increasing the alloy’s service temperature by increasing the alloy content may cause brittle phase Ti 3 Precipitation of X, thereby reducing the thermal stability of the alloy

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