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On June 21, we learned from nanjing university of science and technology that the new high-temperature PST ti/al single crystal material developed by professor Chen guang's team has made a great leap forward in the field of new aerospace materials ti/al alloy.
Aero - engine is known as the heart of the aircraft, and the blade is the most critical core components of aero - engine.
Generally, the main material used in domestic aircraft engine blades is nickel-based high-temperature alloy, and ti-al alloy is currently recognized as the best new lightweight structural material to replace high-temperature alloy.
General motors of the United States used ti-48al-2cr-2nb alloy (hereinafter referred to as "4822 alloy") to replace the original nickel-based high-temperature alloy, and produced the last two stages of low-pressure turbine blades of the engine, which reduced the weight of a single engine by about 200 pounds, and had outstanding effects in saving oil, reducing nitride emissions and reducing noise. The 4822 alloy was used in Boeing 787 aircraft and was officially put into commercial operation in 2009. It became a sensational development in the field of aviation and materials at that time.
However, the high temperature PST single crystal developed by Chen guang's team is superior to "4822 alloy" in core performance and longevity.
At the press conference, Chen guang introduced that the tensile plasticity and yield strength of their high-temperature PST single crystal at room temperature were up to 6.9% and 708 mpa, respectively, and the tensile strength was up to 978 mpa, achieving an excellent combination of high strength and high plasticity.
"More importantly, the alloy at 900 ℃ when the tensile yield strength of 637 million mpa, and excellent creep resistance, the minimum creep rate and lasting life is better than that of the '4822 alloy 1 to 2 orders of magnitude, and is expected to present the use of titanium aluminium alloy temperature increased from 650 ~ 750 ℃ to 900 ℃ or more."Chen guang explained in detail.
Cao chunxiao, a member of the Chinese academy of sciences, an expert on titanium alloys and ti-al intermetallic compounds, and one of the founders of the research and application of titanium alloys in China, said the new materials developed by the team are original, groundbreaking, pioneering and fundamental. |
