Diffusion of Au and Cu in amorphous Fe80B20 and Fe82B18 alloys |
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Authors: | S K Sharma S Banerjee Kuldeep Animesh K Jain |
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Institution: | (1) Physical Metallurgy Division, Bhabha Atomic Research Centre, 400 085 Bombay, India;(2) Nuclear Physics Division, Bhabha Atomic Research Centre, 400 085 Bombay, India |
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Abstract: | Diffusion rates (D) of Au in two amorphous alloys, Fe80B20 and Fe82B18, and of Cu in amorphous Fe82B18 alloy were measured in the temperature range 546–645 K by using the technique of Rutherford backscattering spectrometry (RBS) and Auger electron spectroscopy (AES), respectively. The diffusion of Au was found to be 3 to 6 times faster in Fe80B20 than in Fe82B18, though both the alloys had almost similar crystallization temperatures. The observed differences in the diffusion rates corroborate the fact that Fe80B20 has a more open structure than Fe82B18 as revealed from the reported values of the metal packing fractions of these two alloys. Also, the diffusivities of smaller sized Cu atoms (radius: 0.128 nm) were found to be higher by more than an order of magnitude than those of larger sized Au atoms (radius: 0.146 nm), suggesting a dependence ofD on the size of the diffusing species. |
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Keywords: | 66 30 -h 61 40 Df |
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