High-Strength and Heat-Resistant Alloys with Intermetallics of MEM Technology

摘要

Presentation covers the first steps towards creation of new class of high- and heat-resistant titanium alloys. Traditional solid-solution titanium alloys have been studied extensively and no major break-throughs are likely to occur with these types of materials, either in terms of processing or properties. As such a new class of high-strength and heat-resistant titanium alloys based on α- and β- solid solutions with the addition of a dispersion of intermetallic second phase particles (as in many Al-based alloys) has been investigated. These alloys feature dispersion strengthening by intermetallics and/or with a "rigid frame" of eutectoid former phase in a soft matrix. These alloys have higher physical-mechanical properties than conventional titanium solid solution alloys. In this work, production of these alloys has been achieved by the method of magnetically-controlled electroslag melting (MEM) which leads to a purified, grinded heterogeneous (in terms of the eutectoid former phase) cast structure. Typical room temperature strength level is UTS = 1600 MPa, and use to operating temperatures as high as 700-800°C is proposed.