Abstract
In order to obtain a good hot workability and excellent corrosion resistance in sulphuricacid solution of Ni3Si intermetallic compounds, a process involving a mechanical alloying(MA) method was investigated. However, it was necessary for practicality to improve ductility at room temperature.This paper reports an investigation to improve ductility of Ni3Si intermetallic compounds at room temperature while maintaining good corrosion resistance. The Influence of Nb and B additions on mechanical properties and sulphuric-acid corrosion resi-stance of these compounds was investigated by MA -hot extrusion -heat treatment method. The results showed that Ni3Si intermetallic compounds with 77.5mol%Ni-20.8mol%Si-1.7 mol%Nb-0.024mol%B composition had high ductility and high corrosion resistance. This compound has more than 4% elongation from tensile test at room temperature. The reason why this compound has high ductility may be due to a high a phase content as well as strengthened grain boundaries, which result from segregated B at the grain boundaries. Moreover, corrosion resistance in sulphuric-acid of less than 0.3mm/year was obtained. This is probably due to an improvment of corrosion resistance in the α- and β- phase in spite of the high α-phase content.
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