PING DANG

353 Pennell Circle, Apt.2
Tallahassee, FL 32310
Phone: (904)580-5154(Home) (904)644-5108(Work)
Fax: (904)644-1127
E-mail: pdang@nhfml.gov
World Wide Web: http://www.eng.fsu.edu/~dang

Extensive Experience in Materials Design, Characterization and Testing

• Materials Design and Development
  • Designed a two-phase (gamma+beta) Ti-Al-V alloy where the phase transformation toughening has resulted in a two-fold increase in toughness relative to the single-phase (gamma) titanium aluminide intermetallic alloy.
  • Developed and manufactured a novel 6063-based deformed aluminum alloy which has superior deformation property (awards).
  • Produced Al-Li (RE) alloys using molten salt electrolysis method which has minimized significantly the oxidation loss of Li (RE) metals.
  • Developed a new type of (Rare Earth metals based) modifier for casting Al-Si alloys.
  • Designed casting technologies of cast iron and steel parts.
• Materials Microstructure Characterization
  • Gained extensive experiences in the metallographies of casting (Al-Si, iron and steel), deformed (Al 6063 and Al-Li), superplastic (Al 8090 and Ti-6Al-4V) and intermetallic (TiAl) alloys.
  • Identified phases and structures using DSC, X-Ray Diffraction and TEM/SED (in Ti-Al-V, TiAl, Al 8090, Al 6063 and Al-Si alloys).
  • Conducted fracturegraphy studies using SEM/EDS (in Ti-Al-V, TiAl, 6063 and Al-Si alloys).
• Material Property Testing
  • Conducted strength, fracture toughness and hardness tests (in Ti-Al-V and 6063 alloys).
  • Conducted oxidation and corrosion resistance measurements (in 6063 alloy).
  • Conducted bi-axies (cone) superplastically forming (SPF) and uni-axis constant strain-rate tensile test (in Al 8090, Ti-6Al-4V and Gamma TiAl alloys).

Extensive Research on Materials Modeling Covering Three Hierarchical Levels

• Atomic Scale
  • Conducted extensive computer simulations of crystal defects (grain boundary, dislocation and vacancy) and phase transformation using Molecular Statics/Dynamics.
  • Simulated crack-tip material evolution in single phase (Fe-Ni and Ti-V) as well as two-phase (gamma-TiAl matrix+beta Ti-V dispersion) alloy systems.
  • Studied extensively materials fracture process and martensitic transformation toughening (crack-tip blunting) using Molecular Dynamics simulations.
  • Quantified the toughening effect by evaluating the J integral in an atomistic crystal under transforming.
• Microstructural (Grain) Scale
  • Conducted grain-level micromechanical modeling of superplastic behaviors.
  • Simulated microstructure evolution (grain boundary sliding) in superplastic alloys.
• Continuum Scale
  • Possessed a solid background in fracture mechanics continuum analyses.
    • Solved interface crack problems for two-phase anisotropic materials using Finite Element Analysis.
    • Evaluated materials toughness in two-phase anisotropic materials.
  • Gained strong ability in materials thermodynamics and lattice dynamics calculations.

• Clemson University, South Carolina, U.S.A.,PH.D., 1996 in Mechanical Engineering / Materials Science and Engineering, (GPA: 4.0/4.0)
• Jilin University of Technology, Changchun, China, M.S., 1987 and B.S. 1984 in Materials Science and Engineering, (GPA: 85/100). Was the youngest freshman in the university (15 years old, 1980).

EMPLOYMENT

• Research Associate (8,1996-Present) Advanced Mechanics & Materials Laboratory (AMML), Tallahassee, Florida.
• Research Engineer (8,1987-12,1992) Institute of Applied Chemistry, Chinese Academy of Science, Changchun, China

EXPERIENCES

High-Temperature Processing and Structure Characterization of Ti- and Al- Alloys (Supported by U. S. Army Research Office and Pratt & Whitney, related paper: number 1-4 in "REFEREED PUBLICATIONS IN JOURNALS")

• Performed bi-axis (cone) superplastically forming (SPF) and uni-axis (MTS) constant strain-rate tensile tests (in Al 8090, Ti-6Al-4V and Gamma TiAl alloys).
• Studied microstructure evolution and effects on superplasticity of Ti-based and Al-based alloys using Nikon Optical and Environmental SEM/EDS.
• Developed micromechanical models and predicted successfully the superplastic behaviors in conventional and high strain-rate, single and two phases superplastic materials.
• Conducted computer simulation of grain boundary structure and sliding (GBS) in metallic (Al-based) and ceramic (TZP) superplastic materials.

Dispersed-Phase Transformation Toughening of Gamma Titanium Aluminide (Supported by U. S. National Science Foundation, related papers: 5-16)

• Experiment
  • Designed and prepared two phase (beta+gamma) Ti-Al-V by casting and heat treatments.
  • Identified the phases and structures in these materials using a ZEISS optical microscope, a Scintag XDS 2000 X-Ray Diffractometer and a Hitachi 600AB TEM with SED.
  • Conducted microhardness, tensile and three point bending tests on a computer controlled Instron Test Machine and fractography on a JEOL 848 SEM with EDS.
• Computer Simulation
  • Developed crack displacement, stress and J integral solutions in an anisotropic (atomistic) material and solved interface crack problems for two-phase anisotropic materials using Finite Element Analysis (including the use of ABAQUS software).
  • Simulated crystal defects (dislocation, grain boundary, surface and interface), phase transformation and crack-tip transformation toughening using Molecular Dynamics.
  • Quantified the toughness by evaluating the J integral in an atomistic crystal under transforming using Fracture Mechanics Continuum Analyses.

Industry-based Research on Design and Manufacture of Nonferrous Casting and Deformed Alloys (Supported by National Science and Technology Commission, and The Chinese Academy of Sciences, related papers: 1-9)

• Led a technical team to accomplish an industry-based project: Design and manufacture of a novel 6063-based aluminum alloy (1992 National Third Class Invention Award).
• Designed new (RE contained) additives and related techniques for melt treatment of nonferrous alloys (National First Class Award for Significant Contributions to Advanced Science and Technology).
• Prepared Al-Li, Al (Cu)-RE (RE: Rare Earth metals) master alloys using molten salt electrolysis and applied in commercial nonferrous alloys.
• Conducted in situ microstructure analysis and property test in industry scale melting, extruding and molten salt electrolysis.
• Studied porosity, impurity, fractography (SEM) and DTA and XPS analyses of oxidation and corrosion resistance.

Research on Modification of Al-Si Casting Alloys (Supported by The Chinese Academy of Sciences, related papers: 10-15)

• Determined the microdistributions and contents of trace elements (modifiers) in Al-Si alloys using electrolytic separation, radioassay and autoradiographic techniques.
• Investigated the modifier effect on the morphologies of Si phases using SEM.
• Determined the orientation relationships between eutectic phases using TEM/SED.

Taught laboratory courses: Metallurgy and Materials Property Testing (8 weeks)

Industry Training in Technology of Metals, Metallurgy and Casting

• Designed the Casting and Machining Technologies of a cast steel automobile part (project).
• Designed a Vacuum Casting Technology of a cast iron heat-resisting grid (project).

HONORS & AWARDS

• National Invention Award, Third Class,1992, National Science and Technology Commission, China.
• National Award for Significant Contributions to Advanced Science and Technology, First Class, 1991, The Chinese Academy of Sciences, China.

COMPUTER SKILLS

• Extensive experiences in programming using FORTRAN, C, Maple and Matlab.
• Very familiar with UNIX WorkStation, Silicon Graphics Indigo, Silicon Graphics Power Challenge Supercomputer, Macintosh and MS-DOS systems.
• Familiar with ABAQUS Package in FEM calculation and AutoCAD in design.

• Minerals, Metals & Materials Society (TMS)
• American Society for Metals (ASM International)

1. P. Dang and N.Chandra, "Atomistic Simulation of Grain Boundary Structure, Energy and Sliding", Submitted for publication in Materials Science and Engineering A, September, 1997.

2. P. Dang and N. Chandra, "Application of Micromechanical Model to Dual-Phase Superplastic materials", Accepted for publication in Acta Metallurgica, October, 1997 (in print).

3. N. Chandra and P. Dang, "Application of Micromechanical Model to high Strain-Rate Superplastic materials", Scripta Metallurgica, 1333-1338, 36 (1997).

4. N. Chandra, J. Rama, and P. Dang, "Application of Micromechanical Polycrystalline Model in the Study of Threshold Stress Effect on Superplasticity", Materials Science and Engineering A, 134-143, 231 (1997).

5. M. Grujicic and P. Dang, "Transformation Toughening in the Gamma-TiAl- Beta-Ti-V Systems, Part I: Finite Element Analysis of a Crack Touching the Interface", Journal of Materials Science, 4865-4874, 32 (1997).

6. P. Dang and M. Grujicic, "Transformation Toughening in the Gamma-TiAl- Beta-Ti-V Systems, Part II: A Molecular Dynamics Study", Journal of Materials Science, 4875-4887, 32 (1997).

7. M. Grujicic and P. Dang, "Dispersed Ti-base B.C.C. Beta Phase Transformation Toughening of Gamma-Titanium Aluminide Intermetallics", Materials Science and Engineering A, 187-199, A224 (1997).

8. P. Dang and M. Grujicic, "The Effect of Crack-tip Materials Evolution on Fracture Toughness-An Atomistic Simulation Study of the Ti-V alloy System", Acta Metallurgica et Materialia, 75-87, 45 (1997).

9. M. Grujicic and P. Dang, "A Molecular Dynamics Study of Transformation Toughening in the Gamma TiAl/Beta Ti-V System", Materials Science and Engineering A, 109-125, 219 (1996).

10. P. Dang and M. Grujicic, "A study of Crystal Defects Effect on the Martensitic Transformation in Ti-V B.C.C. Beta Alloy", Modeling and Simulation in Materials Science and Engineering , 123-136, 4 (1996).

11. P. Dang and M. Grujicic, "Atomic Simulation of Crack-tip Transformation in Ti-V beta Alloy", Scripta Metallurgica et Materialia, 59-64, 35 (1996).

12. M. Grujicic and P. Dang, "Atomic-Scale Analysis of Martensitic Transformation in Titanium Alloyed with Vanadium -- Part I: Verification of the EAM Model", Materials Science and Engineering A, 139-152, 205 (1996).

13. M. Grujicic and P. Dang, "Atomic-Scale Analysis of Martensitic Transformation in Titanium Alloyed with Vanadium -- Part II: Molecular Dynamics Study", Materials Science and Engineering A, 153-165, 205 (1996).

14. M. Grujicic and P. Dang, "Computer Simulation of Martensitic Transformation in Fe- Ni Face-Centered Cubic Alloys", Materials Science and Engineering A, 194-204, 201 (1995).

15. M. Grujicic and P. Dang, "Molecular Dynamics/Embedded Atom Method Simulation of Crack-tip Transformation Toughening in Fe-Ni Austenite", Materials Science and Engineering A, 173-182, 199 (1995).

16. M. Grujicic and P. Dang, "Assessment of Thermodynamic Properties of Alloys by Combining the Embedded-Atom and the Quasi-harmonic Method", Calphad, 105-117, 19 (1995).

1. L. Wang, P. Dang, F. Du and M. Zhao, "Effect of Rare Earth Metals on Microstructure of Directional Solidified Al-3% Li Alloys", Journal of Rare Earths (English Edition), 198-201, 12 (1994).

2. P. Dang, L. Zhao, H. Lu and D. Tang, "Effect of Rare Earth on the Microstructure and Properties of Pure Copper", Rare Metals (English Edition), 277-280, 12 (1993).

3. P. Dang, L. Zhao and G. Hu, "Effect of Rare Earth on Anti-Oxidation of Copper", Journal of Applied Chemistry, 111, No.4, 9 (1992).

4. P. Dang, M. Zhao, K. Chang, X. Lu and F. Du, "Modification of the Microstructures of Al-3%Li Alloys", Rare Metals (English Edition), 272, No.4, 10 (1991).

5. P. Dang, Q. Han and W. Du, "Microdistribution and Function of Rare Earth Metals in Al-Si Alloys", Proceedings of the Second International Conference on Rare Earth Development and Application (English), Beijing, China, May 27-31, 1991. International Academic Publishers, Vol. 1, 317.

6. P. Dang and M. Zhao, "Design and Manufacture of a New Type Al-Mg-Si Aluminum Alloys", Rare Earths, 49, No.3, 11 (1990).

7. P. Dang, M. Zhao and S. Guan, "Influence of Rare Earth Metals on the Microstructures and Properties of Al-Mg-Si Alloys", Journal of Rare Earths, 154, No.2, 8 (1990).

8. M. Zhao, P. Dang and X. Gang, "Distribution and Function of Rare Earth Metals in 6063 Aluminum Alloys", Journal of Rare Earths, 59, No.3, 7 (1989).

9. S. Guan, P. Dang and M. Zhao, "Improvement of the Corrosion Resistance of 6063 Aluminum Alloys", Journal of the Chinese Corrosion Society, 154, No.4, 9 (1989).

10. P. Dang, W. Du and Q. Han, "Electrolytic Extraction and Radioactive Measurement of Cerium Contents in Various Phases of Al-Si Alloys", Rare Metals, 246, No.3, 13 (1989).

11. W. Du, P. Dang, Z. Cao and Q. Jiang, "Influence of Modifiers on the Nucleation and Growth of Silicon Phases in Al-Si Alloys", Proceedings of the First International Conference on W-Ti-RE-Sb (English), Changsha, China. International Academic Publishers, 1251, Vol.2 (1988).

12. P. Dang, W. Du, Q. Jiang and Q. Han, "A TEM Study on the Orientation Relationships between Eutectic Si and Eutectic alpha-Al phases in Al-Si Eutectic Alloys", Journal of Rare Earths, 41, No.4, 6 (1988).

13. W. Du, P. Dang and Q. Han, "Autoradiography Study on the Inhomogeneity of Trace Modifier in Al-Si Alloys", Journal of Rare Earths, 59, No.3, 6 (1988).

14. P. Dang, W. Du and Q. Han, "Study on the Iron-contained Impurities in Casting Al-Si
    Alloys", Rare Earths, 43, No.1, 9 (1988).

15. P. Dang , Q. Jiang, W. Du and Q. Han, "Combined Ce and P Modifications of Al- 20%Si Alloys", Rare Earths, 22, No.6, 8 (1987).

1. P. Dang and N. Chandra, "Atomistic and Micro-Continuum Modeling of High- Temperature Deformation Mechanism", ICES'97, May 1997.

2. N. Chandra and P. Dang, "Numerical Modeling of Superplastic deformation Mechanism", Materials Science Forum (Proceedings of 1997 International Conference on Superplasticity), vol. 243-245, 1997, p.53-58.

3. N. Chandra and P. Dang, "Modeling of Superplasticity at three scales", Australia, July, 1997.

1. "Computer Simulation of Material Microstructure Evolution", Supercomputer Computations Research Institute, The Florida State University, March 7, 1996.

2. "Computer Simulation of Fracture Process in Alloys", Department of Mechanical Engineering, FAMU/FSU College of Engineering, The Florida A&M University, The Florida State University, September 17, 1996.

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