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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 3    No. 1    March 1993

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PHASE TRANSFORMATION IN RAPIDLY SOLIDIFIED AI-Cu-Fe ALLOY
Jiang  Xiangyang; Chen  Zhenhua;Wang  Yun; Zhou Duosan

Central South University of Technology. Changsha 410083; China

Abstract:By means of rapid solidification, two Al_(65)Cu_(20)Fe_(15) powders were prepared with water and liquid N_2 as the respective cooling agent. Both powders are composed of a qnasicrystalline icosahedral phase and a crystalline hexagonal phase, with the water-cooled alloy having a higher crystalline phase content. In the isothermal an nealing process, the crystalline phase in the water-quenched alloy begins to decrease at 500℃ and then disap pears at 600~700℃. At about 800℃, new crystalline phases form, and at 900℃, the quasicrystalline phase disappears. Conversely, in the liquid N_2 quenched alloy, the quasicrystalline phase starts to decrease at about 500℃. and the hexagonal phase decomposes into new crystalline phases. At 700~800℃, the quasicrystalline phase disappears. For the water-cooled sample, the quenching at 100~200C makes the crystalline to quasicrystalline phase transformation start at a lower temperature and the crystallization of the quasicrystal occur at a higher temperatur...更多e. For the liquid N_2 quenched alloy, the quenching at 100~400℃, did not affect its phase transformation at high temperature.  

 

Key words: quasicrystal Al-Cu-Fe allou rapid solidification phase transformation

ISSN 1672-7029
CN 43-1423/U

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