Manufacturing of self-passivating tungsten based alloys by different powder metallurgical routes

Calvo, A. and Ordás, N. and Iturriza, I. and Pastor Caño, Jose Ignacio and Tejado Garrido, Elena María and Palacios García, Teresa and García-Rosales, C. (2016). Manufacturing of self-passivating tungsten based alloys by different powder metallurgical routes. "Physica Scripta", v. 2016 (n. T167); pp. 1-6. ISSN 0031-8949. https://doi.org/10.1088/0031-8949/T167/1/014041.

Description

Title: Manufacturing of self-passivating tungsten based alloys by different powder metallurgical routes
Author/s:
  • Calvo, A.
  • Ordás, N.
  • Iturriza, I.
  • Pastor Caño, Jose Ignacio
  • Tejado Garrido, Elena María
  • Palacios García, Teresa
  • García-Rosales, C.
Item Type: Article
Título de Revista/Publicación: Physica Scripta
Date: 19 January 2016
ISSN: 0031-8949
Volume: 2016
Subjects:
Freetext Keywords: Self-passivating tungsten alloys, plasma-facing material, mechanical alloying, HIP
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ciencia de los Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Self-passivating tungsten based alloys will provide a major safety advantage compared to pure tungsten when used as first wall armor 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 hot isostatic pressing (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 route (2) due to difficulties in the uniaxial compaction stage. Flexural strength and fracture toughness measured on samples produced by route (1) revealed a ductile-to-brittle-transition temperature (DBTT) of about 950 °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.

Funding Projects

TypeCodeAcronymLeaderTitle
Horizon 2020633053EUROfusionMAX-PLANCK-GESELLSCHAFT ZUR FORDERUNG DER WISSENSCHAFTEN EVImplementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium
Government of SpainENE2012-30753UnspecifiedUnspecifiedDesarrollo de aleaciones de W autopasivantes para su aplicación en reactores de fusión más allá de ITER (DEMO)
Government of SpainMAT2012-38541-C02-02UnspecifiedUnspecifiedDesarrollo y caracterización mecánica de materiales nanoestructurados para operación bajo condiciones extremas para sistemas de generación de energía: comportamiento mecánica
Madrid Regional GovernmentS2013/MIT-2862MULTIMAT-CHALLENGEAlfredo Güemes GordoMateriales multifuncionales para los retos de la sociedad

More information

Item ID: 40471
DC Identifier: http://oa.upm.es/40471/
OAI Identifier: oai:oa.upm.es:40471
DOI: 10.1088/0031-8949/T167/1/014041
Official URL: https://iopscience.iop.org/article/10.1088/0031-8949/T167/1/014041/meta
Deposited by: Memoria Investigacion
Deposited on: 02 Jun 2016 16:08
Last Modified: 13 Mar 2019 18:42
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