Multi-component, heatproof alloys with niobium

 
A.C.Kulakov,
     

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Electron Microscopy and Strength of Materials - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2016, #22
http://www.materials.kiev.ua/article/2288

Abstract

In this paper the grain structure, phase composition and mechanical properties of multicomponent, heatproof alloys with composition of Nb—16Cr—16Al—16Ti— 16Me—4Si% (at.), where Me is Mo or Zr is investigated. It is shown that the alloy Nb— 16Cr—16Ti—16Mo—16Al—4Si is formed of over 90% (vol.) BCC Nb-based solid solution. Chromium and silicon that have a much smaller atomic radii than more closer to each other in size atomic radii of the remaining alloy components form their phases which summary reaches up to 10% (vol.). Insertion Zr instead of Mo leads to a significant change in the ratio of composition and amounts of the phases formed in the alloy, as well as its mechanical properties. The increase in non-compliance with the atomic radii of the components after insertion of zirconium complicates the formation of a single-phase alloy BCC. Besides the high entropy of mixing the formation of phases in a multi-component alloy is greatly influenced by the ratio of the atomic radii of the alloy components. Full text download


HIGH-TEMPERATURE STRENGTH, NIOBIEVYE ALLOYS, PHASE COMPOSITION, STRUCTURE