Nanjing University of Science and Technology professor Chen Guang team in the national 973 Plan and other funding, the long-term research, in the new aerospace materials titanium alloy made by leaps and bounds. In June 20th, the relevant results published online in the "natural materials". Its tensile ductility at room temperature, yield strength, high temperature creep resistance, thermal capacity and other key performance indicators in the international leader, more than 1 of the United States similar materials 2 orders of magnitude.
2007, Boeing 787 successful test flight. This new type of plane can be 20 percent less fuel and nitrogen (NOx) emissions reduced by 80%, remarkably reduce noise, which could trigger a global concern.
The aircraft engine developed by the United States General Electric (GE), the use of Ti-48Al-2Cr-2Nb (hereinafter referred to as 4822) alloy replacement of nickel based superalloy, to create the final two stage low-pressure turbine blades.
This is the first application of titanium aluminum alloy in the aircraft engine.
Ge uses 4822 alloy can not be called perfect, its room temperature tensile plastic less than 2%, although sufficient to show disdain for the other intermetallic compounds, but it with nickel base alloy than is too brittle. Therefore, GE company to use it in the environmental temperature, the lowest risk coefficient of the end of the two blades, so that even if the break will not cause the entire aircraft out of control.
Americans are so important that the density of the titanium alloy is only half that of the nickel based alloy. In grams weight unit of aircraft engine, the Ge the single engine weight loss of about 200 pounds and became a sensation of air and materials field progress.
Therefore, the titanium aluminum alloy has become a new type of new lightweight structural material, which is recognized as an alternative to Ni based high temperature alloy.
Professor Chen Guang team research results in the material properties to achieve the three major breakthroughs:
First, room temperature tensile ductility and yield strength greatly enhance, respectively, up to 6.9% and 708MPa, tensile strength up to 978MPa, to achieve a high strength and high plasticity of the excellent combination. Two is resistant to creep can be excellent. Three is the ability to greatly enhance the ability to bear.
Aero engine is known as the heart of a plane, subject to the fundamental research ability insufficient, at present our country civil aviation engine basically rely on imports, military jet engines, although there has been some progress, but key performance indicators and developed countries and gap. Turbine blade is one of aircraft engine in the key core components, the bearing temperature directly determines the performance of the engine, especially the thrust to weight ratio. Although the performance of traditional nickel based alloys are good, but its biggest drawback is too heavy, directly lead to the engine's energy efficiency ratio can not be improved. Therefore, scientists from various countries have never stopped looking for a suitable material for the manufacture of aero engine.
"A generation of material generation engine." China Aviation Power Machinery Institute of turbine design, deputy director of the Department of designers Kang Jianxiong said PST titanium aluminum alloy using temperature up to 900 DEG C, can already and nickel base alloy to compete. It can not only be used for blade, and used in turbine disk, high pressure turbine components.
A new material from the laboratory to put on the plane, there is still a long way to go. According to Chen Guang estimates, PST titanium alloy to achieve the application there are 5 - 10 years.

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