Alexandru Stoica

Alexandru Stoica

Position: Instrument Scientist

Instrument: Engineering Materials Diffractometer

Group: Energy and the Environment

Division: Chemical and Engineering Materials Division

Facility: Spallation Neutron Source

Contact: stoicaad@ornl.gov or (865) 241-5710

Oak Ridge National Laboratory, Oak Ridge, TN (2005-present)
Instrument Scientist, Chemical and Engineering Materials Division: instrument commissioning and user support at Vulcan; neutron optics design for other instruments (Topaz, Mandi, Corelli, USANS, Imagine); materials science

Oak Ridge Associated Universities, Oak Ridge, TN (2000-2005)
Research Associate, Spallation Neutron Source: neutron optics design of Vulcan; materials science studies by diffraction (deformation and recrystallization of polycrystalline materials, nanocrystallization in bulk metallic glasses)

Missouri University Research Reactor, University of Missouri, Columbia, MO (1997-2000)
Visiting scientist: neutron optics of elastically bent monochromators

Institute for Physics and Technology of Materials, Bucharest, Romania (1986-1997)
Senior research staff: X-ray and neutron diffraction for materials science, optics of neutron scattering instruments

Institute for Nuclear Power Reactors, Pitesti, Romania (1980-1986)
Research staff: neutron optics (monochromators) and X-ray diffraction (topography)

Joint Institute of Nuclear Research, Dubna, Russia (1975-1979)
Research fellowship: ultra-cold neutrons (UCN) physics

Institute of Atomic Physics, Bucharest, Romania (1970-1975)
Research fellowship: neutron scattering (diffraction, instrument design)

Education

Ph.D. in Physics, Institute of Nuclear Physics and Engineering, Bucharest, Romania, 1983

M.S. in Physics, University of Bucharest, Romania​, 1970

Research

​- neutron diffraction studies of polycrystalline materials under thermo-mechanical testing;

- structure, deformation and nanocrystallization in bulk metallic glasses;

- functional materials exhibiting strong correlation between elastic and electromagnetic properties;

- neutron optics and instrument design;

Selected Publications

Researcher ID: K-3614-2013

Materials science and engineering

Extracting Grain-Orientation Dependent Data from In-Situ Time-of-Flight Neutron Diffraction – I. Inverse Pole Figures
By: Stoica, G.M.; Stoica, A.D.; An, K.; Ma, D.; Vogel, S.C.; Carpenter, J.S.; Wang X.-L.
JOURNAL OF APPLIED CRYSTALLOGRAPHY Volume: 47 Pages: …. Part: 6 Published: DEC 2014

Temperature-dependent elastic anisotropy and mesoscale deformation in a nanostructured ferritic alloy
By: Stoica, G.M.; Stoica, A.D.; Miller M.K.; Ma D.
NATURE COMMUNICATIONS Volume: 5 doi:10.1038/ncomms6178 Published: OCT 2014

Kinetics of Magnetoelastic Twin-Boundary Motion in Ferromagnetic Shape-Memory Alloys
By: Pramanick, A.; Wang, X. -L.; Stoica, A. D.; et al.
PHYSICAL REVIEW LETTERS Volume: 112 Issue: 21 Article Number: 217205 Published: MAY 30 2014

Orientation-dependent evolution of the dislocation density in grain populations with different crystallographic orientations relative to the tensile axis in a polycrystalline aggregate of stainless steel
By: Ungar, Tamas; Stoica, Alexandru D.; Tichy, Geza; et al.
ACTA MATERIALIA Volume: 66 Pages: 251-261 Published: MAR 2014

Measurement of Interface Thermal Resistance With Neutron Diffraction
By: Lee, Seung-Yub; Skorpenske, Harley; Stoica, Alexandru D.; et al.
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME Volume: 136 Issue: 3 Article Number: 031302 Published: MAR 2014

In-situ neutron diffraction study of deformation behavior of a multi-component high-entropy alloy
By: Wu, Y; Liu, WH; Wang, XL; Ma, D; Stoica, AD; et al.
APPLIED PHYSICS LETTERS Volume: 104 Issue: 5 Article Number: 051910 Published: FEB 3 2014

Grain orientation dependence of lattice strains and intergranular damage rates in polycrystals under cyclic loading
By: Zheng, L. L.; Gao, Y. F.; Wang, Y. D.; Stoica A. D.; et al.
SCRIPTA MATERIALIA Volume: 68 Issue: 5 Pages: 265-268 Published: MAR 2013


Neutron optics and instrument design

The IMAGINE instrument: first neutron protein structure and new capabilities for neutron macromolecular crystallography
By: Meilleur, F; Munshi, P; Robertson, L; Stoica, AD; et al.
ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY Volume: 69 Pages: 2157-2160 Part: 10 Published: OCT 2013

Four-circle single-crystal neutron diffractometer at the High Flux Isotope Reactor
By: Chakoumakos, Bryan C.; Cao, Huibo; Ye, Feng; Stoica, Alexandru D.; et al.
JOURNAL OF APPLIED CRYSTALLOGRAPHY Volume: 44 Pages: 655-658 Part: 3 Published: JUN 2011

The macromolecular neutron diffractometer (MaNDi) at the Spallation Neutron Source, Oak Ridge: enhanced optics design, high-resolution neutron detectors and simulated diffraction
By: Coates, L.; Stoica, A. D.; Hoffmann, C.; et al.
JOURNAL OF APPLIED CRYSTALLOGRAPHY Volume: 43 Pages: 570-577 Part: 3 Published: JUN 2010
 

Awards, Honors and Memberships

American Physical Society (APS), member since 1999

The Minerals, Metals & Materials Society (TMS), member since 2003​