With the rapid growth of demand for space technology in various countries around the world, the requirements for elastic materials in the aerospace field are also getting higher and higher: they need to be lightweight, low modulus and high strength to obtain high elastic energy storage density, and Able to maintain stable performance in extreme environments with large temperature differences in space. Currently, materials with such unique properties remain relatively rare. One is because it is difficult to achieve the two opposing properties of high strength and low elastic modulus at the same time. The second is because the binding force between the material atoms will produce "elastic hardening" as the temperature decreases, making it impossible to achieve a wide temperature range. constant elastic modulus.
Mg-21.3Sc strained glass alloy has excellent comprehensive properties at room temperature
Mg-21.3Sc strained glass alloy. Temperature invariance of the elastic mechanical properties
Recently, Xi'an Jiaotong University Frontier Institute Ferrous Smart Materials Research TeamIn lightweight magnesium and scandium A unique "strain glass" alloy is designed by controlling the composition of the alloy - an alloy with frozen nano- martensitic domains. The alloy shows stable and high elastic energy storage density under 200 MPa working stress and a wide temperature range. It is a lightweight low modulus constant elastic alloy. This lightweight strained glass alloy (density is only 2g/cm3, which is equivalent to engineering plastic ) uses the appropriate elastic softening properties of strained glass to offset its inherent elastic hardening, overcomes the above-mentioned principle problems, and achieves a temperature range from room temperature to -150 ℃ constant low modulus (20-23 GPa) in a wide temperature range, while having the highest yield strength level among magnesium alloys (200-270 MPa) and a million times fatigue life. This superior performance is expected to make the Alloys are widely used in high-tech fields such as aerospace and aviation.
The response of strained glass nanodomains to temperature leads to its unique constant low modulus characteristics, which is expected to have important applications in the aerospace field.
This achievement is based on "a kind of constant low modulus and high strength that is almost independent of temperature." "Lightweight strain glass alloy showing nearly temperature-independent low modulus and high strength" (A lightweight strain glass alloy showing nearly temperature-independent low modulus and high strength) was published in "Nature Materials" (Nature Materials). The first author of the article is Liu Chang, a doctoral student in the Frontier Institute of Xi'an Jiaotong University. , the first corresponding author of , is Associate Professor Ji Yuanchao of the Frontier Institute and the State Key Laboratory of Strength of Metal Materials, Professors Wang Dong and Ma Tianyu of the Frontier Institute and Professor Wang Yu of the School of Physics. Participated in this work as a co-author.
This achievement is based on the latest achievement made by the research team in the research direction of strain glass (Strain Glass) and ferroic glass (Ferroic Glass). Strain glass and ferrous glass have become one of the themes of international conferences such as the International Martensite Conference and TMS in the United States. The research team was also invited to write a new entry on condensed matter physics - Ferroic Glass-related content for the Encyclopedia of Condensed Matter Physics 2nd Edition published by Elsevier Publishing House.
Source: Xi'an Jiaotong University
Article link:
https://www.nature.com/articles/s41563-022-01298-y
