Synthesis, crystal structure, microstructure and mechanical properties of (Ti_1-xZr_x)₃SiC₂ MAX phase solid solutions

Synthesis, crystal structure, microstructure and mechanical properties of (Ti_1-xZr_x)₃SiC₂ MAX phase solid solutions

Qu, L. (TU Delft (OLD) MSE-1; Harbin Engineering University)
Bei, G. (TU Delft (OLD) MSE-1)
Stelzer, Bastian (Rheinisch-Westfälische Technische Hochschule)
Rueß, Holger (Rheinisch-Westfälische Technische Hochschule)
Schneider, Jochen M. (Rheinisch-Westfälische Technische Hochschule)
Cao, Dianxue (Harbin Engineering University)
van der Zwaag, S. (TU Delft Novel Aerospace Materials)
Sloof, W.G. (TU Delft (OLD) MSE-1)

2019

Almost pure (Ti_1-xZr_x)₃SiC₂ MAX phase solid solutions with x ranging up to 0.17 were synthesized at temperatures in the range of 1450–1750 °C with reactive Spark Plasma Sintering (SPS). The zirconium partially replaces the M-element titanium of the Ti₃SiC₂ MAX phase up to x equals 0.17. The lattice parameters of the hexagonal (Ti_1-xZr_x)₃SiC₂ MAX phase are determined with X-ray diffraction using Rietveld refinement and show an anisotropic lattice expansion upon Zr insertion into Ti₃SiC₂. This observation is in very good agreement with density functional theory calculations where the deviation between the measured and calculated lattice parameter is less than 1%. The predicted elastic modulus reduction is only 4%. This behavior can be rationalized by considering the electronic structure, where only minute changes are observable as Zr is incorporated into Ti₃SiC₂. The measured nanohardness of the synthesized (Ti_1-xZr_x)₃SiC₂ MAX phase increases from 12.7 ± 1 GPa for Ti₃SiC₂ to 16.3 ± 1.1 GPa when x is raised from 0 to 0.17 due to an increasing amount of accompanying Ti_1-yZr_yC. The elastic moduli of (Ti_1-xZr_x)₃SiC₂ solid solutions measured by an ultrasonic pulse-echo method (325–354 GPa) are in good agreement with the predicted elastic moduli (357–342 GPa).

(TiZr)SiC
Crystal structure
MAX phases
Mechanical properties
Solid solution

http://resolver.tudelft.nl/uuid:e81b3fff-8c06-4c9b-8d88-dad7f4fbb42d

https://doi.org/10.1016/j.ceramint.2018.10.030

2019-12-31

0272-8842

Ceramics International, 45 (1), 1400-1408

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2019 L. Qu, G. Bei, Bastian Stelzer, Holger Rueß, Jochen M. Schneider, Dianxue Cao, S. van der Zwaag, W.G. Sloof