Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7971559 | Materials Science and Engineering: A | 2018 | 8 Pages |
Abstract
The precipitating behavior of Cu-riched particles during isothermally aging and its effect on hardness and damping capacity of Fe-16Cr-2.5Mo-1.0Cu damping alloy have been investigated by atom probe tomography (APT) and scanning transmission electron microscopy (STEM). The results show that aging at temperature range from 400â¯Â°C to 700â¯Â°C has minor influence on grain size. During aging at temperature below 400â¯Â°C, the supersaturated Cu dose not precipitate out. While aging temperature is 450â¯Â°C, a relatively small number of Cu-riched particles can be observed and the particle radius is small (1.5â¯Â±â¯0.56â¯nm). With a further increasing aging temperature, the Cu-riched particles increase to 3.21â¯Â±â¯0.52â¯nm at 550â¯Â°C and further grow to 12.88â¯Â±â¯2.02â¯nm at 700â¯Â°C. As compared with 450â¯Â°C, the particle number increases significantly at 550â¯Â°C, and then decreases at 700â¯Â°C. Due to the stable grain size and no precipitate, the hardness keeps constant below 400â¯Â°C. With a further increasing aging temperature, the hardness increases gradually and reaches peak value aging at 600â¯Â°C due to the increase of Cu-riched particle number. The damping capacity significantly depends on particle. Once there appear Cu-riched particles, the damping capacity decreases obviously. During aging, both hardness and damping capacity of the alloy can keep stable when temperature is below 400â¯Â°C.
Keywords
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Xiaofeng Hu, Yuanyuan Song, Desheng Yan, Lijian Rong,