The influence of alloying and heat treatment on the hardening of alloys dased on Zr—Nb

Abstract

It is studied the effect of alloying zirconium by niobium, chromium, iron, and tin on the structure, phase composition and strength. It is established that the complex alloying zirconium by niobium, chromium and iron is most effective for hardening. It is shown that in the cast alloy Zr—1Nb—0,5Cr—0,5Fe, received with TIG melting, there is a separation intermetallic particles and particle of solid solution based on niobium. When the number of input niobium increases to 2,5% (wt.), only intermetallic particles were found in as-cast alloy. Hardening from temperatures of the α-field leads to a refinement of α-Zr grains and intermetallic particles of the Zr—2,5Nb—0,5Cr—0,5Fe alloy. The possibility of β-phase strengthening as a result of the solid solution formation, separation of different types particles and change of grain size by heat treatment and alloying were studed. Full text download