New aluminium alloy withstands extreme temperatures
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A research team at Tianjin University has unveiled a groundbreaking oxide dispersion strengthened aluminium alloy, extending its service temperature range from 350 to 500 °C. This innovation addresses the longstanding challenge of utilizing aluminium alloys in environments surpassing 400 °C. The team’s findings, titled Heat-resistant super-dispersed oxide strengthened aluminium alloys, have been published in the prestigious journal ‘Nature Materials’.
High-performance alloy for aerospace and transport applications
Industries such as aerospace and transport have a pronounced need for increased speed and reduced weight, placing greater emphasis on the heat resistance of lightweight metal materials. While aluminium alloys boast advantages like low density, high specific strength, and corrosion resistance, their limited heat resistance within the critical temperature range of 350 to 500 °C poses a significant challenge, especially in aerospace applications. Hence, ongoing progress in the R&D of high-performance heat-resistant aluminium alloys, specifically tailored for temperatures spanning from 350 to 500 °C, is of paramount importance.
Remarkable tensile strength of +200 Mpa
To tackle this obstacle, the research team led by Professor He Chunnian from Tianjin University’s School of Materials Science and Engineering introduced high-density, ultrafine-sized, uniformly dispersed oxide nanoparticles into the aluminium alloy, successfully enhancing its high-temperature resistance. Their innovative approach in material preparation addressed the persistent challenge of nanoparticle dispersion, transforming theoretical ideals into tangible outcomes. As a result, the newly engineered aluminium alloy demonstrated a remarkable tensile strength exceeding 200 MPa at 500 °C, surpassing traditional aluminium alloys by over 6-fold, and achieving a significant enhancement in high-temperature stability spanning several orders of magnitude.
Outstanding thermal stability of materials
© Tianjin University
“Truly outstanding properties”
Following the publication of the research, Professor Alexis Deschamps, a renowned international expert in metallic materials from Université Grenoble Alpes in France, offered comprehensive commentary and profound analysis regarding the importance and potential ramifications of this study. He stated that this material “shows truly outstanding properties, ..., at 500 °C the MgO/Al alloy remains at a tensile strength of 200 MPa and has very impressive creep properties, which clearly override the state of the art”. He then pointed out that this development opens a field for application of aluminium alloys in high-temperature environments, where they could compete, at lower weight, with some titanium alloys.
As Prof. He Chunnian put it, the novel process is straightforward, cost-effective and easy for mass production. He noted that the team is partnering with prominent industry leaders and research institutions to drive forward the development of heat-resistant aluminium alloys tailored for aerospace engines and critical aerospace components and expected the material to be put to industrial use in the near future.
Uniform dispersion of oxide nanoparticless in aluminium matrix
© Tianjin University
Resource: Tianjin University
https://www.tju.edu.cn/english/info/1010/8090.htm#:~:text=A%20research%20team%20at%20Tianjin,environments%20surpassing%20400%20degrees%20Celsius.
