Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Manufacturing of self-passivating tungsten based alloys by different powder metallurgical routes
Year:2015
Research Areas
  • Engineering
Information
Abstract
Self-passivating tungsten based alloys will provide a major safety advantage compared to pure tungsten when used as first wall armour of future fusion reactors, due to the formation of a protective oxide layer which prevents the formation of volatile and radioactive WO3 in case of a loss of coolant accident with simultaneous air ingress. Bulk WCr10Ti2 alloys were manufactured by two different powder metallurgical routes: 1) mechanical alloying (MA) followed by HIP of metallic capsules, and 2) MA, compaction, pressureless sintering in H2 and subsequent HIPing without encapsulation. Both routes resulted in fully dense materials with homogeneous microstructure and grain sizes of 300 nm and 1 µm, respectively. The content of impurities remained unchanged after HIP, but it increased after sintering due to binder residue. It was not possible to produce large samples by the second route due to difficulties in the uniaxial compaction stage. Flexural strength and fracture toughness measured on samples produced by the first route revealed a suctile-to-brittle-transition temperature (DBTT) of about 900°C. The strength increased from room temperature to 800°C, decreasing significantly in the plastic region. An increase of fracture toughness is observed around the DBTT.
International
Si
Congress
15th International Conference on PLASMA-FACING MATERIALS and COMPONENTS for FUSION APPLICATIONS
970
Place
Aix-en-Provence, Francia
Reviewers
Si
ISBN/ISSN
0000-0000
Start Date
18/05/2015
End Date
22/05/2015
From page
1
To page
1
15th International Conference on PLASMA-FACING MATERIALS and COMPONENTS for FUSION APPLICATIONS Program
Participants
  • Autor: A. Calvo (CEIT and TECNUN (University of Navarra))
  • Autor: N. Ordás (CEIT and TECNUN (University of Navarra))
  • Autor: Jose Ignacio Pastor Caño (UPM)
  • Autor: Elena Maria Tejado Garrido (UPM)
  • Autor: Teresa Palacios Garcia (UPM)
  • Autor: C. García-Rosales (CEIT and TECNUN (University of Navarra))
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Materiales Estructurales Avanzados y Nanomateriales
  • Centro o Instituto I+D+i: CENTRO INVEST. MATERIALES ESTRUCTURALES (CIME)
  • Departamento: Ciencia de Materiales
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