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Indexed by:期刊论文

Date of Publication:2017-07-05

Journal:MATERIALS & DESIGN

Included Journals:SCIE、EI、Scopus

Volume:125

Page Number:55-61

ISSN No.:0264-1275

Key Words:Divertor; Tungsten; RAFM steel; Brazing; Alloy design

Abstract:The effective joining of tungsten and reduced activation ferritic-martensitic (RAFM) steels is crucial to fabrication of the divertor components of fusion reactors. In the presentwork, a lowneutron-activation filler metal system of Ti-Fe-Sn was designed to realize the so-called exothermic-reaction-assisted brazing. A series of three-layered Ti-Fe- Sn thin film assemblies were made by electroplating, which allowed the brazing of tungsten with a CLF-1 RAFM steel to be carried out at a temperature as low as 1090 degrees C. The joint structures made from the Sn-bearing filler metals demonstrated high strength and high resistance against thermocycling. The Sn-film layer in the filler assembly has delivered favorable alloying effects on depressing separation of Ti element in the W grain boundaries and the formation of pores, and on microstructure refinement in the brazed joints as well. (C) 2017 Elsevier Ltd. All rights reserved.