Publication detail

A Comparative Study of the Impact of La2O3 and La2Zr2O7 Dispersions on Molybdenum Microstructure, Mechanical Properties, and Fracture

TKACHENKO, S. SLÁMEČKA, K. BEDNAŘÍKOVÁ, V. REMEŠOVÁ, M. GEJDOŠ, P. KSENZOVA, O. VALÁŠEK, D. DVOŘÁK, K. ŠULÁK, I. GÁLÍKOVÁ, M. BALÁŽ, M. DEÁK, A. CIHLÁŘ, J. ČELKO, L.

Original Title

Type

journal article in Web of Science

Language

English

Original Abstract

We report, for the first time, the effect of lanthanum zirconate (La2Zr2O7) particles on the microstructure and mechanical behavior of an experimental molybdenum oxide dispersion-strengthened alloy. The focus was on the preparation of the novel Mo-La2Zr2O7 composite using high-energy ball milling and spark plasma sintering and on the comparison of its microstructural and mechanical properties with pure Mo and Mo-La2O3 ODS alloy counterparts. Mechanical properties were assessed using a Vickers hardness test at room temperature and a three-point flexural test in the temperature range from - 150 to 150 degrees C. The microstructure of the studied materials and their fracture behavior were evaluated using x-ray diffraction, energy-dispersive x-ray spectroscopy, and scanning electron and transmission electron microscopy. The strengthening effect of La2Zr2O7 particles was found to be lower than that of La2O3 particles, resulting in a 30-35% lower yield stress and flexural strength of the Mo-La2Zr2O7 alloy compared to the Mo-La2O3 alloy. The experimental Mo-La2Zr2O7 alloy exhibited low plasticity and no distinct ductile-to-brittle transition temperature (DBTT) in the tested temperature range, unlike pure Mo and the Mo-La2O3 alloy, which had the DBTT of 63 and 1 degrees C, respectively. Fracture occurred mainly in a brittle intergranular manner in the entire testing temperature range, while the counterpart materials showed localized plastic stretching at grain boundaries and within grains at and above the transition region. The observed behavior was primarily related to lower strengthening and brittleness as well as less effective grain boundary purification.

Keywords

DBTT; fracture; lanthanum zirconate; molybdenum; rare-earth oxide

Authors

TKACHENKO, S.; SLÁMEČKA, K.; BEDNAŘÍKOVÁ, V.; REMEŠOVÁ, M.; GEJDOŠ, P.; KSENZOVA, O.; VALÁŠEK, D.; DVOŘÁK, K.; ŠULÁK, I.; GÁLÍKOVÁ, M.; BALÁŽ, M.; DEÁK, A.; CIHLÁŘ, J.; ČELKO, L.

Released

23. 10. 2024

Publisher

SPRINGER

Location

NEW YORK

ISBN

1544-1024

Periodical

Journal of Materials Engineering and Performance

Number

October

State

United States of America

Pages count

URL

https://link.springer.com/article/10.1007/s11665-024-10300-4

BibTex

@article{BUT191165,
  author="Serhii {Tkachenko} and Karel {Slámečka} and Vendula {Bednaříková} and Michaela {Remešová} and Pavel {Gejdoš} and Olha {Ksenzova} and Daniel {Valášek} and Karel {Dvořák} and Ivo {Šulák} and Markéta {Gálíková} and Matej {Baláž} and Andréa {Deák} and Jaroslav {Cihlář} and Ladislav {Čelko}",
  title="A Comparative Study of the Impact of La2O3 and La2Zr2O7 Dispersions on Molybdenum Microstructure, Mechanical Properties, and Fracture",
  journal="Journal of Materials Engineering and Performance",
  year="2024",
  number="October",
  pages="12",
  doi="10.1007/s11665-024-10300-4",
  issn="1544-1024",
  url="https://link.springer.com/article/10.1007/s11665-024-10300-4"
}