| RESEARCH
INTEREST
Structure/property
relationships of metals, alloys, intermetallics, and advanced ceramics;
transmission electron microscopy (TEM); application of TEM and crystallography
to crystal structure analysis and phase transformations; deformation behavior
of alloys and intermetallics, development of high temperature structural
materials, and mechanical alloying processing.
EDUCATION
- Ph.D.
in Materials Science and Engineering, University of Florida, Gainesville,
December 1996.
- Dissertation
- "Phase Transformations in the Central Portion of the Nb-Ti-Al
Ternary System."
- M.S. in
Materials Science and Engineering, University of Florida, Gainesville,
December 1991.
- Thesis
- "The Effect of Copper and Nickel on the Neutron Irradiation
Damage in Iron Alloys."
- B.S. in
Materials Science and Engineering, University of Florida, Gainesville,
August 1985.
- Senior
Research - Investigated the ductile crack initiation process for
an A-543 pressure vessel steel by correlating the stretch zone width
with the crack tip opening displacement of the crack.
EMPLOYMENT
HISTORY
Research
Staff Member — Metals & Ceramics Division, Oak Ridge National
Laboratory, Oak Ridge, TN. May 2000 to present. Current research projects:
Principle
investigator of LDRD project investigating a new phenomena involving
the formation of stable oxygen-rich nanoclusters in a ferritic alloy
that was mechanically alloyed with yttria resulting in a dramatic
improvement in high temperature strength over existing iron-based
alloys.
Co-principle
investigator on I-NERI project collaborating with scientists from
CEA-Saclay in France investigating the deformation and fracture behavior
of advanced nano-composited steels for high temperature structural
applications in nuclear energy reactors.
Investigating
solute interactions between Ti and interstitial O, C, and N impurities
by studying the dynamic strain aging deformation behavior of V-4Cr-4Ti
and vanadium.
Investigating
the precipitation behavior and developing a process for redistributing
interstitial O, C, and N solutes by controlled precipitation to improve
properties of V-4Cr-4Ti, such as the low temperature fracture toughness
and radiation hardening and the high temperature creep strength.
Post-Doctoral
Research Fellowship — Metals & Ceramics Division, Oak Ridge
National Laboratory, Oak Ridge, TN. September 1998 to May 2000.
Conducted
research on various projects based on structure/property/processing
relationships relevant to the Fusion Energy Program.
TEM
Technical Specialist and Adjunct Instructor - New York State College
of Ceramics at Alfred University (NYSCC), Alfred, NY. August 1992 to
August 1998.
Instructor
of graduate level TEM course which included lecture and laboratory
sessions covering microscope components and operation, electron diffraction,
amplitude and phase contrast image formation, image/diffraction interpretation,
and specimen preparation for materials science applications.
Worked
with faculty, students, and industrial clients in the area of analytical
TEM characterization. Responsible for generating and interpreting
data from imaging, diffraction, and x-ray energy dispersive spectroscopy
(XEDS) techniques appropriate to the needs of specific projects. Also,
instructed and performed suitable specimen preparation methodologies.
Manager
of the TEM facility: JEOL 2000FX Analytical/Scanning Transmission
Electron Microscope, PGT XEDS analyzer, Gatan DuoMill Ion-Mill, Edwards
carbon evaporator, other specimen preparation equipment, and photographic
darkroom facilities.
Graduate
Research Assistant - Department of Materials Science and Engineering,
University of Florida, Gainesville, FL. September 1985 to August 1987
and May 1988 to December 1991.
TEM
Microscopist (part-time) - Major Analytical Instrumentation Center
(MAIC), University of Florida, Gainesville, FL. August 1987 and May
1988.
MEMBERSHIP
IN PROFESSIONAL ASSOCIATIONS
Materials
Research Society (MRS)
Microscopy Society of America (MSA)
ASM International
Executive Committee Member; Oak Ridge Chapter, 1999 to present.
Executive Committee Member; S.W. New York Chapter, 1996-1998.
Sigma
Xi
Air Force Association (AFA).
RESEARCH
PUBLICATIONS
- Stability
of Ti-, Y-, and O-Enriched Particles in a MA/ODS Ferritic Alloy, M.K.
Miller, D.T. Hoelzer, S.S. Babu, E.A. Kenik, and K. F. Russell,
to be presented at the 49th International Field Emission Symposium,
will be published in the J. de Physique, (2002).
- Atom Probe
Tomography of Nanoscale Particles in ODS Ferritic Alloys, M.K. Miller,
E.A. Kenik, K.F. Russell, D.T. Hoelzer, and P.J. Maziasz, accepted
in 2001 for publication in Mater. Sci. and Eng. A.
- Investigating
Solute Interactions in V-4Cr-4Ti Based on Tensile Deformation Behavior
of Vanadium, D.T. Hoelzer and A.F. Rowcliffe, presented at ICFRM-10
in Baden-Baden in 2001, will be published in J. Nuclear Materials.
- Effect
of Periodic Temperature Variations on the Microstructure of Neutron
Irradiated Metals, S.J. Zinkle, N. Hasimoto, D.T. Hoelzer, A.L.
Qualls, T. Muroga, and B.N. Singh, presented at ICFRM-10 in Baden-Baden
in 2001, will be published in J. Nuclear Materials.
- Templated
Growth of a Complex Nitride Island Dispersion Through an Internal Nitridation
Reaction, M.P. Brady, D.T. Hoelzer, E.A. Payzant, P.F. Tortorelli,
J.A. Horton, I.M. Anderson, L.R. Walker, and S.K. Wrobel, J. Mater.
Res., 16:10, (2001), p. 2784.
- A Microstructural
Study of Oxide Scale Formation on ODS Fe-13Cr Steel, D.T. Hoelzer, B.A.
Pint, and I.G. Wright, J. Nuclear Materials, 283-287, (2000),
p. 1306.
- Solute
Interactions in Pure Vanadium and V-4Cr-4Ti Alloy, D.T. Hoelzer, M.K.
West, S.J. Zinkle, and A.F. Rowcliffe, J. Nuclear Materials, 283-287,
(2000), p. 616.
- Effect
of Strain Rate on the Tensile Properties of Unirradiated and Irradiated
V-4Cr-4Ti, A.F. Rowcliffe, S.J. Zinkle, and D.T. Hoelzer, J. Nuclear
Materials, 283-287, (2000), p. 508.
- Development
of an Oxide Dispersion Strengthened, Reduced-Activation Steel for Fusion
Energy, G.R. Romanoski, L.L. Snead, R.L. Klueh, and D.T. Hoelzer,
J. Nuclear Materials, 283-287, (2000), p. 642.
- Impurity
Effects on Gas Tungsten Arc Welds in V-Cr-Ti Alloys, M.L. Grossbeck,
J.F. King, and D.T. Hoelzer, J. Nuclear Materials, 283-287, (2000),
p. 1356.
- Microstructures
in Ti-Al Intermetallic Compounds Irradiated at 673K in HFIR, Y. Miwa,
T. Sawai, K. Fukai, D.T. Hoelzer, and A. Hishinuma, J. Nuclear Materials,
283-287, (2000), p. 273.
- An Electron
Microscopy Study of the Formation of Hydroxyapatite Through Sol-Gel
Processing, A. Jillavenkatesa, D.T. Hoelzer, and R.A. Condrate,
J. Materials Science, 34, (1999), p. 4821.
- Grain
Boundaries and Growth Kinetics of Polycrystalline Ferrimagnetic Oxides
with Chemical Additives, Y.S. Cho, D.T. Hoelzer, V.L. Burdick,
and V.R.W. Amarakoon, J. Applied Physics, 85:8, (1999), p. 1.
- Cordierite-Based
Dielectric Thick Films on an Oxidized Copper Layer: Microstructural
Evidence of Copper Diffusion, Y.S. Cho, D.T. Hoelzer, W. Schulze, and
V.R.W. Amarakoon, J. American Ceramic Society,
82:7, (1999), p. 1949.
- Crystallization
and Microstructural Evolution of Cordierite-Based Thick Film Dielectrics,
Y.S. Cho, D.T. Hoelzer, W.A. Schulze, and V.R.W. Amarakoon,
Acta Mater., 46:18, (1998), p. 6421.
- Interfacial
Characterization of Plasma-Sprayed Calcium Phosphate Coatings on Ti-6Al-4V,
E. Park, R.A. Condrate, Sr., D.T. Hoelzer, and G.S. Fischman,
J. Materials Science: Materials in Medicine,
9:11, (1998), p. 643.
- The Effect
of Aluminum on the Formation of Orthorhombic Plates in the Nb-Ti-Al
Ternary System, D.T. Hoelzer and F. Ebrahimi, High-Temperature
Ordered Intermetallic Alloys VII, MRS Symposium Proceeding, Materials
Research Society, 460, (1997), p. 97.
- Analysis
of the Interface Between Plasma-Sprayed Hydroxyapatite Coating and Ti,
E. Park, D.T. Hoelzer, and R.A. Condrate, Thin Films, MRS Symposium
Proceeding, Materials Research Society, 458, (1997),
p. 409.
- Interactions
at Metal/InP Interfaces Formed at 300K and 77K, J. Palmer, W. Anderson,
D.T. Hoelzer, and H. Hardtdegen, Compound Semiconductor Electronics
and Photonics, MRS Symposium Proceeding, Materials Research Society,
421, (1996), p. 257.
- Grain-Oriented
Ferroelectric Bismuth Titanate Thin Films Prepared from Acetate Precursor,
Y. Lu, D.T. Hoelzer, W. Schulze, B. Tuttle, and B.G. Potter,
Mat. Sci. Eng., B39, (1996), p. 41.
- Cross-Sectional
TEM of Pd/InP and Au/InP Interfaces Formed at Substrate Temperatures
Near 300K and 77K, J.W. Palmer, W.A. Anderson, D.T. Hoelzer,
and M. Thomas, J. Electronic Materials, 25, (1996), p. 1645.
- Modification
of Microstructure for Improved Oxidation Resistance in Gamma-Based Ti-Al-X
Alloys, M.P. Brady, J.L. Smialek, E.D. Verink, Jr., D.T. Hoelzer,
and R. Stone, Materials and Manufacturing Processes, 11:4, (1996), p.
635.
- Examination
of Y2Cu2O5 Additions on Microstructural
Development in YBa2Cu3O7-d Superconductors,
J.G. Fagan, K.D. Vuong, D.T. Hoelzer, X.W. Wang, C.Q. Shen, V.R.
Amarakoon, and R.L. Snyder, Applied Superconductivity, 3:1-3, (1995),
p. 91.
- Effect
of Copper and Nickel on the Neutron Irradiation Damage in Iron Alloys,
D.T. Hoelzer and F. Ebrahimi, Microstructure in Irradiated Materials,
MRS Symposium Proceeding, Materials Research Society, 373, (1995), p. 57.
- High Resolution
Microscopy of Pd/InP Interfaces, J.W. Palmer, W.A. Anderson, and D.T.
Hoelzer, Evolution of Thin Film and Surface Structure and Morphology,
MRS Symposium Proceeding, Materials Research Society, 355, (1995), p.
477.
- Grain
Growth Behavior of Bismuth Titanate Thin Film on Metallic Silicon Substrates,
Y. Lu and D.T. Hoelzer, Evolution of Thin Film and Surface Structure
and Morphology, MRS Symposium Proceeding, Materials Research Society,
355, (1995), p. 607.
- Photosensitivity
in a Silica-Based Sol-Gel Glass, D.M. Korwin, D.T. Hoelzer, and L.D.
Pye, Symposium Proceeding on Preparation of Materials Via Soft Chemistry,
97th Annual Meeting, (1995).
- Ferroelectric
Thin Film Bismuth Titanate Prepared from Acetate Precurser, Y. Lu, D.T.
Hoelzer, W.A. Schulze, B. Tuttle, and B.G. Potter, Penn. State
Conference on Ferroelectrics, Aug. 1994.
- Fracture
Toughness of + x Microstructures in the Nb-Ti-Al System, F.
Ebrahimi, D.T. Hoelzer, and J.R. Castillo-Gomez, Materials Science
and Engineering, A171, (1993), p. 35.
- The Effect
of Rapid Solidification on the Oxidation Behavior of a Nb-Ti-Al Alloy,
M.P. Brady, R.K. Stone, D.T. Hoelzer, S.P. Elder-Randall, and E.D. Verink,
Jr., in "Processing and Fabrication of Advanced Materials for High Temperature
Applications," Eds: T.S. Srivatsan and V.A. Ravi, TMS, (1992),
p. 239-248.
- An Investigation
of Phase Stability in the Ternary Niobium-Titanium-Aluminum System,
D.T. Hoelzer and F. Ebrahimi, in "High Temperature Niobium Alloys,"
TMS, Warrendale, PA (1991), p. 105.
- The Effect
of Copper and Nickel on the Neutron Irradiation Damage in Iron Alloys,
D.T. Hoelzer, MS Thesis, Univ. of Florida, (1991).
- Phase
Stability of Sigma + Beta Microstructures in the Ternary Nb-Ti-Al System,
D.T. Hoelzer and F. Ebrahimi, Material Research Society Symposium
Proceeding, Materials Research Society, Vol. 194, (1990), p. 393.
- Development
of a Mechanistic Understanding of Radiation Embrittlement in Reactor
Pressure Vessel Steels, F. Ebrahimi, D.T. Hoelzer, D. Venables, and
V. Krishnamoorthy, Final Report NUREG/CR-5063 MEA-2268, (1988).
- Microstructural
Characterization of Irradiated Fe-Cu-Ni-P Model Steels, M.K. Miller,
D.T. Hoelzer, F. Ebrahimi, J.R. Hawthorne, and M.G. Burke, in "Environmental
Degradation of Materials in Nuclear Power Systems-Water Reactors," TMS/AIME,
Warrendale, PA (1988), p. 133.
- On the
Effect of Cu on -Carbide Nucleation, F. Ebrahimi, B. Hoover,
and D.T. Hoelzer, Scripta Metallurgica, Vol. 22, (1988), p. 219.
- Characterization
of Irradiated Model Pressure Vessel Steels, M.K. Miller, D.T. Hoelzer,
F. Ebrahimi, J.R. Hawthorne, and M.G. Burke, Journal De Physique,
Colloque 6, (1987), p. 423.
- A Study
of the Correlation Between Crack Tip Opening Displacement (CTOD) and
Stretch Zone Width (SZW), D.T. Hoelzer, J.A. Ali, and F. Ebrahimi, Scripta
Metallurgica, Vol. 20, (1986), p. 1575.
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