Mechanical Assistant
Resume:
Jie Geng
**** ******* ***, **** *, Ames, IA *****, USA; Cell: 401-***-****; E-mail:
*******@*****.***
Visa status: Green card holder
Education
PhD in Materials Science and Metallurgy, University of Surrey, U.K. June
2006
M.Eng. in Materials Science, Shanghai Institute of Ceramics, Chinese July
Academy of Sciences 2002
B.Eng. in Materials Science & Engineering, Huazhong University of June
Science & Technology, China 1999
Technical Skills
Extensive hands-on experiences on materials synthesis, characterization
and experiment design, especially on processing-structure-property
relationships in aluminum and magnesium alloys.
. Materials synthesis and processing: solid state reaction
(ceramics), plasma arc melting, vacuum induction casting,
extrusion, rolling, sintering, heat treatment, single crystal
growth by Bridgeman method.
. Structural and compositional characterization: X-ray diffraction
(XRD), scanning and transmission electron microscopes (SEM and
TEM), HR-TEM, EDX, EBSD, FIB, AFM, optical microscopy, DSC, TG-DTA,
hardness testing, mechanical testing, failure analysis,
fractography.
Experiences
Research Associate, Jan. 2014 - Present
Ames Laboratory of US DOE, Ames, IA, USA
. Nanotwinned Materials for Energy Technologies: to examine the
underlying mechanisms of plasticity in nanotwinned (nt-) samples
targeted for high strength coupled with improved thermal stability.
> The deposition of nt-Cu/Ag thin films by sputter deposition
and mechanical testing.
> The characterization of nanotwinned materials by using XRD,
(in-situ)-TEM, STEM, and (t)-EBSD.
. Rapid assessment methodologies: to efficiently explore the optimum
compositions for various material systems and establish useful
material information (such as ternary phase diagrams), involving 3D
printing, XRD, DSC, SEM and TEM.
Postdoctoral Research Associate, Jan. 2011 - Dec. 2013
School of Engineering, Brown University, Providence, RI, USA
. Aluminum alloys design and characterization (texture,
precipitation, dislocation).
. Investigation on deformation mechanism (dislocation and deformation
twinning) along different directions in magnesium single crystals
by using TEM, SEM and FIB, providing fundamental insights to
improve the room temperature ductility of magnesium and its alloys.
. Hundreds of hours' operation time on FEI Helios DualBeam FIB/SEM,
FEI CM20 and JEOL 2100 TEMs.
Research Fellow, May 2007 - Dec. 2010
ARC Centre of Excellence for Design in Light Metals, Monash University,
Melbourne, Australia
. Developed a novel Mg-Zn-Co alloy system with an enhanced age-
hardening response compared to other Mg-Zn based alloys, resulting
in improved strength and lower cost.
. Improved the compressive/tensile yield strength ratio in magnesium
wrought alloys to near 1 (0.3-0.4 for most of commercial Mg wrought
alloys) by texture modification and precipitation.
. Characterization of texture evolution in rare-earth containing
magnesium alloys by EBSD.
. Characterization of the microstructure of casting and wrought
magnesium alloys before and after deformation, especially on the
phase identification and the interaction of twins and particles in
precipitation-hardenable alloys by SEM and TEM.
Graduate Research Assistant, University of Surrey, Oct. 2002 - Jul.
2006
. Designed and prepared multi-component Nb-18Si-5Cr-5Al base in-situ
composites, which are developed for high temperature applications
as alternative materials to Ni-base superalloys.
. Characterization of the microstructure of the composites by XRD,
SEM and TEM.
. Evaluated the effects of alloy chemistry on microstructure, phase
transformation, phase selection, phase stability and oxidation
behaviour of the Nbss/Nb5Si3 base composites.
. Improved the oxidation resistance of the Nbss/Nb5Si3 base
composites by addition of Sn.
Graduate Research Assistant, Shanghai Institute of Ceramics, CAS, Sep.
1999 - Jul. 2002
. Proposed a novel microwave heating route to synthesize SrAl2O4:
Eu2+, Dy3+ phosphors. This process is more economical than
traditional high temperature solid-state reaction process, showing
wonderful potentials in both industry and laboratory.
. Investigated the properties and luminescent mechanism of alkaline
earth aluminates phosphors co-doped by Eu2O3 and Dy2O3.
Book
. Development of niobium silicide based in situ composites: Next
generation materials for high temperature applications, 2010, LAP
Lambert Academic Publishing, Germany (ISBN 978-3-8383-3085-3).
Selected Publications (http://www.researcherid.com/rid/B-8899-2009)
1. Incipient plasticity and deformation mechanisms in single-crystal
Mg during spherical nanoindentation. Acta Materialia, 2013, 61(8):
2953-2965.
2. Phase equilibria and transformations in ternary Mg-rich Mg-Y-Zn
alloys. Acta Materialia, 2012, 60(17): 5948-5962.
3. [0001] compression response at room temperature of single crystal
magnesium. Scripta Materialia, 2012, 67(7-8): 700-703.
4. Effect of plate-shaped particle distributions on the deformation
behaviour of magnesium alloy AZ91 in tension and compression. Acta
Materialia, 2012, 60(1): 218-228.
5. Processing and properties of Mg-6Gd-1Zn-0.6Zr: Part 2 - Mechanical
properties and particle twin interactions. Mater. Sci. Eng. A,
2011, 528(10-11): 3659-3665.
6. Enhanced age-hardening response of Mg-Zn alloys via Co additions.
Scripta Materialia, 2011, 64(6): 506-509.
7. Study of three-phase equilibrium in the Nb-rich corner of Nb-Si-Cr
system. Intermetallics, 2006, 14(7), 832-837.
8. Oxidation of Nb-Si-Cr-Al in situ composites with Mo, Ti and Hf
additions. Mater. Sci. Eng. A, 2006, 441(1-2), 26-38.
9. Synthesis of long afterglow SrAl2O4: Eu2+, Dy3+ phosphors through
microwave route. Journal of Materials Synthesis and Processing,
2002, 10(5), 245-248.
Activities
. Committee member of the Journal of Materials Engineering and
Performance.
. Committee member of TMS Materials and Society.
. Reviewer for Materials Chemistry & Physics, Intermetallics,
Materials Characterization, Materials Letter, Metallurgical &
Materials Transactions A, and Materials Science & Engineering A.
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