期刊
NATURE
卷 602, 期 7896, 页码 251-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41586-021-04309-1
关键词
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资金
- Research Grant Council, Hong Kong Government, through the General Research Fund (GRF) [CityU11213118, CityU11200719, HKU 11211019]
- Guangdong Major Project of Basic and Applied Basic Research, China [2019B030302010]
- City University of Hong Kong [9610391]
- Academia Sinica Career Development Award [2317-1050100]
- National Natural Science Foundation of China [51871054]
The development of high-performance ultraelastic metals is crucial for various industrial applications, and chemically complex alloys with large atomic size misfits have shown promising properties, including a high elastic strain limit and a constant elastic modulus at room temperature.
The development of high-performance ultraelastic metals with superb strength, a large elastic strain limit and temperature-insensitive elastic modulus (Elinvar effect) are important for various industrial applications, from actuators and medical devices to high-precision instruments(1,2). The elastic strain limit of bulk crystalline metals is usually less than 1 per cent, owing to dislocation easy gliding. Shape memory alloys(3)- including gum metals(4,5) and strain glass alloys(6,7)-may attain an elastic strain limit up to several per cent, although this is the result of pseudo-elasticity and is accompanied by large energy dissipation(3). Recently, chemically complex alloys, such as thigh-entropy' alloys(8), have attracted tremendous research interest owing to their promising properties(9-)(15). In this work we report on a chemically complex alloy with a large atomic size misfit usually unaffordable in conventional alloys. The alloy exhibits a high elastic strain limit (approximately 2 per cent) and a very low internal friction (less than 2 x 10(-4)) at room temperature. More interestingly, this alloy exhibits an extraordinary Elinvar effect, maintaining near-constant elastic modulus between room temperature and 627 degrees Celsius (900 kelvin), which is, to our knowledge, unmatched by the existing alloys hitherto reported.
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