EurekAlert February 9, 2022
An international team of researchers (Hong Kong, China, USA- Argonne National Laboratory, France) has discovered a high-entropy alloy called Co25Ni25(HfTiZr)50, (high-entropy Elinvar alloy) reveals the Elinvar effect, that is the alloy firmly retains its elastic modulus over a very wide range of temperature changes. It becomes slightly stiffer than, it is at room temperature, and it expands without any notable phase transition. The experiment verified that the microstructure and mechanical properties of the alloy were insensitive to annealing at 1,273 K (1,000 °C) for different time durations. Because of the combination of the unique structural features, the high-entropy it has a very high energy barrier against dislocation movements and displays elastic strain limit and a nearly 100% energy storage capacity. It has an elastic limit of about 2% in bulk forms at room temperature, in sharp contrast to conventional crystalline alloys which have an elastic limit of less than 1%. It has applications in aerospace industry, and high-precision devices…read more. Open Access TECHNICAL ARTICLE
DFT calculation of three structure models for the Co25Ni25(HfTiZr)50 alloy. Credit: Nature volume 602, pages251–257 (2022)Â