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Intergranular fracture surface analysis of molybdenum
Author(s) -
Morito Fumio
Publication year - 1990
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740150706
Subject(s) - transgranular fracture , materials science , grain boundary , metallurgy , intergranular fracture , intergranular corrosion , microstructure , alloy , molybdenum , cathode ray , fracture (geology) , cohesion (chemistry) , composite material , electron , chemistry , physics , organic chemistry , quantum mechanics
Bend properties of plasma beam and/or electron beam melted molybdenum and several dilute alloys containing C, B, T, V and Re were investigated. Fracture surfaces and microstructure were examined in detail by SEM and AES. Considerable intergranular fracture occurred in almost all of the samples as the test temperature decreased. But proper alloy addition, such as B and Ti, and hot‐rolling induced a change in the fracture mode to a transgranular mode. Segregation of nitrogen and/or oxygen to grain boundaries was often recognized in plasma beam or electron beam melted ingots and decreased the strength of grain boundaries. Small precipitates due to comparatively low alloy addition such as C, B, Ti and Re, were effective to enhance the grain boundary cohesion.