In situ studies of crack tip deformation processes and the effects of hydrogen on these processes

Conference · · TMS (The Metallurgical Society) Paper Selection; (USA)

OSTI ID:5309587

Robertson, I M; Birnbaum, H K ^[1]

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1. Univ. of Illinois, Urbana (USA)

The technique of in situ stressing in an environmental cell in the TEM has been applied to examine the crack tip processes during fracture of a number of metals and alloys and to study the effects of gaseous H{sub 2} on these processes. These observations were correlated with studies carried out on macroscopic specimens using in situ fracture in the SEM and other techniques to establish the relationships between microscopic and macroscopic observations. In the present paper the authors describe the techniques used for Mode I in situ fracture studies and some of the observations made on the behavior of Ni and its alloys. The dislocation structures formed at the tips of the crack and the dynamic processes by which the fracture propagates are described. The effects of hydrogen on the crack tip deformation and fracture are described.

• DOE Contract Number: AC02-76ER01198
• OSTI ID: 5309587
• Report Number(s): CONF-840909--
• Conference Information: Journal Name: TMS (The Metallurgical Society) Paper Selection; (USA) Journal Volume: 56
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CATALYTIC EFFECTS
CRACK PROPAGATION
CRACKS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEFORMATION
DISLOCATIONS
ELECTRON MICROSCOPY
ELEMENTS
FAILURES
FRACTURE MECHANICS
FRACTURES
HYDROGEN
LINE DEFECTS
MECHANICS
METALS
MICROSCOPY
NICKEL
NICKEL ALLOYS
NONMETALS
SCANNING ELECTRON MICROSCOPY
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY