Crack-tip microstructure of elastic-plastic crystals using SXRF

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

OSTI ID:5310192

Bilello, J C ^[1]

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1. New York State Univ., Stony Brook (USA)

Synchrotron x-ray fractography (SXRF) uses white beam synchrotron radiation in a special reflection mode to study the morphology of cleavage surfaces. The method is rapid, non-destructive and allows quantitative assessment of the sub-face microstructure associated with elastic-plastic crack initiation and propagation. Studies using SXRF are compared with other methods of fractography; e.g. optical, SEM, and Berg-Barrett x-ray topography. Studies of the plastic relaxation zones developed from precursor cracks in Mo, Nb, Mo-Nb alloys, Zn, and Zn-Cd alloys are described. Techniques for analyzing the image contrast for SXRF data in terms of deformation microstructure are presented. Results indicate that different mechanisms pertain for cleavage failure in the presence of a sharp notch for Nb when contrasted to Mo. Further, that large changes in cleavage energies for alloys cannot always be rationalized in terms of surface energy arguments, but rather must be considered in relation to changes in deformation modes at the crack-tip.

• OSTI ID: 5310192
• Report Number(s): CONF-840909-; CODEN: TMPSA
• Journal Information: TMS (The Metallurgical Society) Paper Selection; (USA), Vol. 56; Conference: TMS-AIME fall meeting, Detroit, MI (USA), 16-20 Sep 1984; ISSN 0197-1689
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CADMIUM ALLOYS
MICROSTRUCTURE
CRACKS
MOLYBDENUM
MOLYBDENUM ALLOYS
NIOBIUM
NIOBIUM ALLOYS
ZINC
ZINC ALLOYS
CLEAVAGE
COMPARATIVE EVALUATIONS
DEFORMATION
FAILURES
MEASURING METHODS
NOTCHES
OPTICAL MICROSCOPY
SCANNING ELECTRON MICROSCOPY
SURFACE ENERGY
TOPOGRAPHY
X-RAY SPECTROSCOPY
ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
ELEMENTS
ENERGY
FREE ENERGY
METALS
MICROSCOPY
PHYSICAL PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties