Study on the Influence of the New Type of Powder Metallurgy Ti-Al-Nb Alloy Hot Press Sintering Process on the Microstructure

Shuang Fang,Huaping Xiong,Mincong Zhang,Qiuying Yu,F.-N Shi,D Dobrota,Y.-L Lin,J.-S Li,G Korotcenkov,R Dastjerdi

doi:10.1051/e3sconf/202129903010

Shuang Fang, Huaping Xiong + Show 8 more

Open Access

https://doi.org/10.1051/e3sconf/202129903010

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Abstract

Based on the hot-pressing sintering process, the kinetics of hot-pressing sintering crystal grain growth and the hot-pressing sintering densification kinetics, the mixing ratio of the raw material powder and the hot-pressing sintering system are designed. The pressure is maintained at 30 MPa from the temperature rise to the end of the sintering process, and wait until the temperature reaches the corresponding hot pressing sintering temperature (1200°C~1400°C), keep the corresponding time for 1.5h~4.5h, stop heating and depressurize, and the alloy billet is cooled to room temperature with the furnace. The main phases of Ti2AlNb powder and hot pressing sintering process are TiAl and Ti3Al.

Highlights

Ti2AlNb alloy is a Ti-Al intermetallic compound with orthogonal structure O phase as the matrix. Because it has good strength, plastic toughness and creep resistance at 650oC~700oC, and the density is low, so it has good application potential in the aviation and aerospace fields, but it is generally believed that the long-term stable working temperature of this material is difficult to exceed 700oC
The γ-TiAl intermetallic compound has a series of advantages such as low density, high specific strength, high specific rigidity and good high temperature performance
It is generally believed that its long-term use temperature can even reach 750oC~800oC

Summary

Introduction

Ti2AlNb alloy is a Ti-Al intermetallic compound with orthogonal structure O phase as the matrix. Because it has good strength, plastic toughness and creep resistance at 650oC~700oC (typical room temperature performance data: tensile The strength is about 1100MPa, the elongation is 8-14%[1,2]), and the density is low, so it has good application potential in the aviation and aerospace fields, but it is generally believed that the long-term stable working temperature of this material is difficult to exceed 700oC. It is generally believed that its long-term use temperature can even reach 750oC~800oC (typical high temperature performance data: 800oC, tensile strength About 500MPa [3,4,5]). It should be said that there is currently a lack of a titanium-based superalloy with a longterm operating temperature of 700°C to 750°C (room temperature elongation of more than 5.0%) in the aviation field

Experimental

Results and discussion

Conclusions