Abstract
In this paper, the alloying effects of minor Cu on the relationship between microstructure and corrosion resistance of (Fe0·76Si0·09B0·1P0·05)99 − xNb1Cux (x = 0, 0·25, 0·5, 0·75, 1) ferromagnetic bulk metallic glasses (BMGs) were investigated in details. The microstructure characterisation has revealed that the introduction of proper Cu elements leads to the presence of α-Fe clusters in the as-cast amorphous rods. In addition, α-Fe nanocrystals with a suitable size and volume fraction can accelerate the formation of the protective passive layers at nanocrystals/amorphous interfaces, and lead to the improvement of corrosion resistance. However, when the Cu content x exceeds 0·75, the corrosion resistance of the FeSiBPNbCu BMGs reduces significantly. All the results imply that the Cu content plays a key role in the characteristic size of α-Fe nanoparticles embedded in the glassy matrix, and there is a dependent correlation between the corrosion resistance and the microstructure.
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