Nb-Al Binary System: Reevaluation of the Solubility Limits of the (Nb), Nb3Al, Nb2Al and NbAl3 Phases at High Temperatures

Abstract

In this work a re-investigation of the solubility limits of the (Nb), Nb 3 Al, Nb 2 Al and the Nb-rich side of the NbAl 3 phases on the Nb-Al system is presented. Alloys in the binary fields ((Nb)+Nb 3 Al, Nb 3 Al+Nb 2 Al and Nb 2 Al+NbAl 3 ) were arc-melted, and then equilibrated at 1000, 1200 and 1400 °C. The phases were confirmed via X-ray powder diffractometry, and their compositions were determined via EPMA measurements. The results showed agreement with the literature concerning the solubility limits of (Nb), Nb 3 Al and NbAl 3 phases, while important differences in the values were found for the Nb 2 Al phase. In addition, the lattice parameters of the Nb 2 Al phase were determined via Rietveld refinement. This new set of more accurate experimental information indicates that a thermodynamic reassessment is necessary to precisely describe this system.

Sıcak Presleme Yöntemiyle Üretilen Nb Takviyeli Mg Matrisli Kompozitlerin Mikroyapı ve Mekanik Özellikleri

“…Matris alaşımı için karışımlarda ağırlıkça %5 Sn ve %4 Zn kullanılmıştır. Nb içerisinde ağırlıkça %7,4 oranına kadar Al alaşım elementi çözünebilmektedir [35]. Bu nedenle, içeriğinde Al içermeyen Mg-Sn-Zn alaşımı matris olarak seçilmiştir.…”

Phase Transitions in the Co–Al–Nb–Mo System

“…To determine the phase equilibria in the Co-Al-Nb-Mo system, data on the following three ternary systems: Co-Al-Mo, Co-Nb-Mo, and Co-Al-Nb may be used [1,[4][5][6][7]. The phase analysis in binary phase diagrams Al-Mo [8], Co-Mo [9], Co-Nb [7,9,10], Co-Al [11], Nb-Mo [12], and Nb-Al [7,13] may also be used.…”