Evaluationof fracture toughness ofalpha-Nb5Si3 by micro-sized cantilever beam testing. Issue 1760 (18th February 2015)

• Record Type: Journal Article
• Authors: Suzuki, Shiori; Sekido, Nobuaki; Ohmura, Takahito; Miura, Seiji
• Editors: Baker, I.; Heilmaier, M.; Kishida, K.; Mills, M.; Miura, S.
• Is Part Of: MRS proceedings. Issue 1760(2015)
• Publication Date: 2015-02-18
• Subjects: Nb, -- toughness, -- fracture; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/opl.2015.147
• Languages: English
• ISSNs: 0272-9172

Abstract

ABSTRACT: A micro-sized fracture testing method has been applied to investigate fracture toughness of alpha-Nb5 Si3 . Chevron-notched single crystal specimens with a size of 3 x 3 x 15 μm 3 were prepared in a grain of polycrystalline alpha-Nb5 Si3 by focused ion beam, FIB, technique. Fracture tests were conducted using a nanoindenter at room temperature and linear load-displacement curves and smooth fracture surfaces were obtained. This fracture behavior was presumed to be brittle fracture similar to bulk alpha-Nb5 Si3 . The average of fracture toughness K Q is 3.45 ± 0.29 MPa√m under a small-scale yielding condition.