Diffusion pressure welding of NiAl and Ni₃Al-based alloys with St3S steel

Abstract

Alloys containing phases on intermetallic structures, known as intermetallic compounds, belong to the new generation of metallic materials which possess properties lying between those of metals and ceramics. They are alloys of two or more metals which have crystalline structures that are different from those of the crystalline structures of individual component metals. For a number of years, intermetallic compounds were regarded as useful when they appeared as dispersed phases in conventional alloys, but in many situations, for example in the bonding of ceramics with metals, such phases are undesirable because of their brittleness. However, as the knowledge of their unique properties, especially of their behaviour at elevated temperatures and in hostile environments increases, the idea of using this group of materials for constructional purposes has been born. Systems containing intermetallic compounds had been investigated and it was shown that a new and unique group of alloys can be created by combining the matrices of nickel, iron and titanium with that of aluminium.