Phys.org November 11, 2022
Eliminating grain boundaries (GBs) is a primary approach to resisting high-temperature creep in metals which is responsible for component failures at high temperatures.
Researchers in China found that grain boundaries in the nanograined single-phased alloy could be effectively stabilized through structural relaxation, and the creep performance of the alloy could be significantly enhanced at elevated temperatures. They demonstrated a creep resistance, with creep rates of ~10–7 per second under gigapascal stress at 700°C (~61% melting point), outperforming that of conventional superalloys. They plan to extend this principle to other engineering alloy families for high-temperature applications, including nickel-based alloys and steels…read more. TECHNICAL ARTICLE
A bright-field TEM image showing extremely fine grains. Credit: Institute of Metal Research. Credit: SCIENCE, 10 Nov 2022, Vol 378, Issue 6620, pp. 659-663Â