Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Mechanical characterisation of tungsten-1wt.% yttrium oxide as a function of temperature and atmosphere
Year:2014
Research Areas
  • Engineering
Information
Abstract
This study evaluates the mechanical behaviour of an Y2O3-dispersed tungsten (W) alloy and compares it to a pureWreference material. Both materials were processed via mechanical alloying (MA) and subse- quent hot isostatic pressing (HIP). Weperformed non-standard three-point bending (TPB) tests in both an oxidising atmosphere and vacuum across a temperature range from 77 K, obtained via immersion in liquid nitrogen, to 1473 K to determine the mechanical strength, yield strength and fracture toughness. This research aims to evaluate how the mechanical behaviour of the alloy is affected by oxides formed within the material at high temperatures, primarily from 873 K, when the materials undergo a massive thermal degradation. The results indicate that the alloy is brittle to a high temperature (1473 K) under both atmospheres and that the mechanical properties degrade significantly above 873 K. We also used Vickers microhardness tests and the dynamic modulus by impulse excitation technique (IET) to determine the elastic modulus at room temperature. Moreover, we performed nanoindentation tests to determine the effect of size on the hardness and elastic modulus; however, no significant differ- ences were found. Additionally, we calculated the relative density of the samples to assess the porosity of the alloy. Finally, we analysed the microstructure and fracture surfaces of the tested materials via field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). In this way, the relationship between the macroscopic mechanical properties and micromechanisms of failure could be determined based on the temperature and oxides formed.
International
Si
JCR
Si
Title
Journal of Nuclear Materials
ISBN
0022-3115
Impact factor JCR
2,016
Impact info
Datos JCR del año 2013
Volume
454
10.1016/j.jnucmat.2014.09.012
Journal number
From page
455
To page
461
Month
NOVIEMBRE
Ranking
Participants
  • Autor: Teresa Palacios Garcia (UPM)
  • Autor: Antonio Jiménez (UPM)
  • Autor: Ángel Muñoz (UC3M)
  • Autor: Miguel Ángel Monge (UC3M)
  • Autor: Carmen Ballesteros (UC3M)
  • Autor: Jose Ignacio Pastor Caño (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Materiales Estructurales Avanzados y Nanomateriales
  • Departamento: Ciencia de Materiales
  • Centro o Instituto I+D+i: CENTRO INVEST. MATERIALES ESTRUCTURALES (CIME)
S2i 2021 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)