In situ strain profiling of elastoplastic bending in Ti-6Al-4V alloy by synchrotron energy dispersive x-ray diffraction

Journal Article · Fri May 01 00:00:00 EDT 2009 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3122029· OSTI ID:21356135

Croft, M ^[1]; Shukla, V; Akdogan, E K; Sadangi, R; Ignatov, A; Balarinni, L; Tsakalakos, T ^[2]; Jisrawi, N ^[2]; Zhong, Z ^[3]; Horvath, K ^[1]

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1. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854 (United States)
2. Department of Materials Science and Engineering, Rutgers University, Piscataway, New Jersey 08854 (United States)
3. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973 (United States)

Elastic and plastic strain evolution under four-point bending has been studied by synchrotron energy dispersive x-ray diffraction. Measured strain profiles across the specimen thickness showed an increasing linear elastic strain gradient under increasing four-point bending load up to approx2 kN. The bulk elastic modulus of Ti-6Al-4V was determined as 118 GPa. The onset of plastic deformation was found to set in at a total in-plane strain of approx0.008, both under tension and compression. Plastic deformation under bending is initiated in the vicinity of the surface and at a stress of 1100 MPa, and propagates inward, while a finite core region remains elastically deformed up to 3.67 kN loading. The onset of the plastic regime and the plastic regime itself has been verified by monitoring the line broadening of the (100) peak of alpha-Ti. The effective compression/tension stress-strain curve has been obtained from the scaling collapse of strain profile data taken at seven external load levels. A similar multiple load scaling collapse of the plastic strain variation has also been obtained. The level of precision in strain measurement reported herein was evaluated and found to be 1.5x10{sup -5} or better.

• OSTI ID: 21356135
• Journal Information: Journal of Applied Physics, Vol. 105, Issue 9; Other Information: DOI: 10.1063/1.3122029; (c) 2009 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHEMICAL ANALYSIS
LINE BROADENING
MAXIMUM PERMISSIBLE ACTIVITY
PLASTICITY
PLASTICS
PRESSURE RANGE GIGA PA
TITANIUM ALLOYS
TITANIUM-ALPHA
VANADIUM ALLOYS
X-RAY DIFFRACTION
ALLOYS
COHERENT SCATTERING
DIFFRACTION
ELEMENTS
MATERIALS
MECHANICAL PROPERTIES
METALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
POLYMERS
PRESSURE RANGE
SAFETY STANDARDS
SCATTERING
STANDARDS
SYNTHETIC MATERIALS
TITANIUM
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENTS