The nanocrystalline structures of Fe-Ni-P-B alloy solidified at large undercooling and the liquid Spinonal decomposition of alloy melt

Acta Metall Sin

2006, Vol. 42

Issue (8): 870-874 DOI:

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The nanocrystalline structures of Fe-Ni-P-B alloy solidified at large undercooling and the liquid Spinonal decomposition of alloy melt

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清华大学

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;. The nanocrystalline structures of Fe-Ni-P-B alloy solidified at large undercooling and the liquid Spinonal decomposition of alloy melt. Acta Metall Sin, 2006, 42(8): 870-874 .

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Abstract It has been found that the undercooling of Fe40Ni40P14B6 alloy melt can be enhanced greatly by using fluxing purification technique. The results show that the solidification structures of the alloy at different undercooling are quite difference and the microstructure can be refined significantly by increasing the undercooling. When the undercooling is large enough, nanosize solidification structure can be obtained. In present work, at the undercooling of 360K, the as-prepared bulk nanocrystalline alloy possesses the average grain size of 40nm. It has been found that the alloy melt will experience Spinodal decomposition resulting in appearance of the network characteristics in solidification structure if the undercooling is large enough. The thermodynamics analysis results indicate that the characteristic sizes of the network structure resulted by Spinodal decomposition are close related to the undercooling of the alloy melt, the larger the undercooling, the smaller the grain size.

Key words: fluxing technique spinodal decomposition undercooling nano-structure

Received: 22 November 2005

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I8/870

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