(Nbx, Zr1−x)4AlC3 MAX Phase Solid Solutions: Processing, Mechanical Properties, and Density Functional Theory Calculations

Research output: Contribution to journalArticle

Authors

  • Thomas Lapauw
  • Dario Tytko
  • Kim Vanmeensel
  • Shuigen Huang
  • Pyuck-Pa Choi
  • Dirk Raabe
  • El'ad N. Caspi
  • Offir Ozeri
  • Moritz to Baben
  • Jochen M. Schneider
  • Konstantza Lambrinou
  • Jozef Vleugels

Institutes & Expert groups

  • MPI - Max Planck Institute for Iron Research
  • KUL - Katholieke Universiteit Leuven
  • NNRC - Negev Nuclear Research Center - Israel
  • SNRC - Soreq nuclear research center
  • RWTH - Aachen University

Documents & links

Abstract

The solubility of zirconium (Zr) in the Nb4AlC3 host lattice was investigated by combining the experimental synthesis of (Nbx, Zr1−x)4AlC3 solid solutions with density functional theory calculations. High-purity solid solutions were prepared by reactive hot pressing of NbH0.89, ZrH2, Al, and C starting powder mixtures. The crystal structure of the produced solid solutions was determined using X-ray and neutron diffraction. The limited Zr solubility (maximum of 18.5% of the Nb content in the host lattice) in Nb4AlC3 observed experimentally is consistent with the calculated minimum in the energy of mixing. The lattice parameters and microstructure were evaluated over the entire solubility range, while the chemical composition of (Nb0.85, Zr0.15)4AlC3 was mapped using atom probe tomography. The hardness, Young’s modulus, and fracture toughness at room temperature as well as the high-temperature flexural strength and E-modulus of (Nb0.85, Zr0.15)4AlC3 were investigated and compared to those of pure Nb4AlC3. Quite remarkably, an appreciable increase in fracture toughness was observed from 6.6 ± 0.1 MPa/m1/2 for pure Nb4AlC3 to 10.1 ± 0.3 MPa/m1/2 for the (Nb0.85, Zr0.15)4AlC3 solid solution.

Details

Original languageEnglish
Pages (from-to)5445-5452
JournalInorganic Chemistry
Volume55
Issue number11
DOIs
Publication statusPublished - 9 May 2016

Keywords

  • Solubility, Zr, nanolaminated , phase solid solutions, processing, mechanical properties, density functional theory, calculations

ID: 2505566