CALPHAD-aided Development of Quaternary Multi-principal Element Refractory Alloys Based on NbTiZr (Postprint)
Abstract
Equilibrium phase diagrams for ten MeX(NbTiZr)100-X alloy systems, where Me is Al, Cr, Fe, Hf, Mo, Re, Si,Ta, V or W and X ranges from 0 to 25 at were calculated using the PanNb2018a database recently developed by CompuTherm, LLC. By the type of phases and sequence of formation, these alloy systems can be divided into two groups. The first group of quaternary alloys, containing Al, Hf, Mo, Ta, or V has a single-phase BCC region below the solidus line over the entire X range and can be considered as potential candidates for the development of single-phase high entropy alloys. The second group consists of the quaternary alloy systems in which the fourth element (Cr, Fe, Re, Si or W) has limited solubility in BCC NbTiZr, which leads to the formation of an additional phase below the solidus and above the solubility limit. These quaternary alloy systems can be used for the development of precipitation or dispersoid strengthened complex concentrated alloys.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 28, 2018
- Accession Number
- AD1068510
Entities
People
- C Wooward
- C. Zhang
- E.J. Payton
- Fengwangdong Zhang
- O.N. Senkov
Organizations
- Air Force Research Laboratory Materials and Manufacturing Directorate