Boon-Chai Ng

Qualifications

 


Research Interests

Intermetallics materials, Deformation and fracture of materials.

Experience

Associate Professor (August 2002 – to date)

Develop curriculum for the mechanical engineering program.

Set up Materials Testing, Fluid Mechanics and Mechanical Engineering Laboratories.

Conduct lectures and laboratories in the mechanical engineering program.

Setup contacts between the students and the local industries to do senior design projects.

Participates in search committees and other advisory committees within the university.

 

Research Assistant (Jan 1994 - 2002) Michigan State University

Examine the nature of grain to grain deformation transfer and to characterize the conditions which lead to slip transfer or crack initiation. Electron Channeling Contrast Imaging (ECCI), Selected Area Channeling Patterns (SACP) and Electron Backscattering Patterns (EBSP) techniques, performed using scanning electron microscopy, are used in this study.

Studies of dislocation generation and motion in thin foils as well as bulk single crystals NiAl alloys using transmission electron microscopy and scanning electron microscopy. Use ECCI technique to determine the mechanisms of toughening at crack tips by examining the nature of dislocation generation and motion in bulk 4-point bend samples.

Research work include sample preparation, mechanical testing and heat treatment processes.

Taught and graded undergraduates laboratory classes in materials and processes land X-Ray. Taught and graded a graduate class in electron microscopy laboratory class.

 

Maintenance of safety and cleanliness of dark room, chemical preparation, material testing and microscopy laboratories.

 

Summer Intern- Hydroforming Project

May 2001 - August 2001 General Motors Corporation

Carried out hydroforming operation on a 200 ton press machine. Chemically etched grid circles and/or bonded strain gauges onto welded steel tubes to measure the strain distribution at various locations on the tubes before and after hydroformed operations.

 

Operation Manager

MSU Student Food Bank (June 1999 to August 2000)

Ensure the smooth running of the Food bank. Purchase and/or collect food supplies from various food stores. Develop a systematic data collection for all the foodbank clients. Provide weekly as well as quarterly reports on the operation of the foodbank.

 

Training Officer 1982 - 1990

Vocational and Industrial Training Board Singapore

Researched, developed and conducted vocational training programs such as materials and processes, workshop maintenance and workshop practices such as welding, machining and sheet-metal working.

Attended in-plant training in the following companies:

* Material Testing: Singapore Institute of Standards and Industrial Research (SISIR).

* Heat Treatment and Electroplating: Sundstrand Pacific Pte. Ltd.

* Heat Treatment and Materials Testing: General Electric AeroSpace Organisation (GEASO).

 

Vehicle Mechanics

1979-1981       Singapore Armed Forces Singapore

* Inspected, repaired and tested motor vehicles .

* Scheduled planned maintenance of vehicles.

 

Professional Affiliations

 

·                    American Society of Materials (ASM)

·                    American Society of Mechanical Engineers (ASME)

·                    Society of Automotive Engineers (SAE)

 

Publications

 

  1. B.C. Ng, T.R. Bieler and M.A. Crimp, "A Hybrid Method to rapidly determine the true orientation of TiAl crystals from SACP patterns and EBSDP maps", manuscript in preparation.
  2. T.R. Bieler, B.C. Ng, A.U. Telang, and M.A. Crimp, “Application of OIM to Study Heterogeneous Deformation in the Vicinity of Grain Boundaries”, In A Collection of OIM Applications, ed. S. I. Wright, EDAX Inc., 2005, pp. 73-78.
  3. B.C. Ng, T.R. Bieler and M.A. Crimp, D.E. Mason, "Prediction of crack paths based upon detailed microstructure characterization in a near-g-TiAl Alloy, Materials Damage Prognosis Edited by J.M .Larsen, J.R. Calcaterra, L. Christodoulou, M.L. Dent, W.J. Hardman, J.W. Jones, S.M. Russ, TMS (The Minerals, Metals & Materials Society),pp.307 –314, 2005.
  4. T.R. Bieler, A. Fallahi, B.C. Ng, D. Kumar, M.A, Crimp, B.A. Simkin, A. Zamiri, F. Pourboghrat, D.E. Mason, "Fracture Initiation/Propagation Parameters for Duplex TiAl Grain Boundaries Based on Twinning, Slip, Crystal Orientation, and Boundary Misorientation". Intermetallics 13(9), pp. 979-984 (2005).
  5. S. Robin, B.C. Ng and P. Polidoro, " Failure in Internally Pressurized Bent Tubes", Metallurgical and Materials Transactions A, Vol. 35A, March 2004, pp. 1151-1158.
  6. B.C. Ng, T. R. Bieler, M. A. Crimp, D.E. Mason, "Twin Activity At The Crack Tip In Near-Gamma TiAl Using Electron Channeling Contrast Imaging". Gamma Titanium Aluminides 2003, eds Y.W. Kim et al, TMS, Warrendale, PA. 2004, pp. 503-508.
  7. B.C. Ng, B.A. Simkin, M.A. Crimp, T.R. Bieler," The Role of Mechanical Twinning on Microcrack Nucleation and Crack Propagation in a Near-Gamma TiAl Alloy, Intermetallics, 12 (2004) 1317-1323.
  8. B.A. Simkin, B.C. Ng, T.R. Bieler, M.A. Crimp, and D.E. Mason, "Orientation determination and defect analysis in the near-cubic intermetallic g-TiAl using SACP, ECCI, and EBSD", Intermetallics 11 (2003) pp.215-223.
  9. M.A. Crimp, B.C. Ng, B.A. Simkin, and T.R. Bieler, "Microcrack Nucleation and Crack Propagation in g TiAl", Defect Properties and Related Phenomena in Intermetallic Alloys, E.P. George, M.J. Mills, H. Inui, and G. Eggeler eds, MRS Proceedings, Vol. 753, pp. 143-148 (2003).
  10. M.A. Crimp, B.A. Simkin, B.-C. Ng, D.E. Mason, and T.R. Bieler, "Microscale Characterization of Deformation Defects in Bulk Intermetallic Alloys using Electron Channeling Contrast Imaging, Proc. THERMAC 2003', T. Chandra, J.M. Torralba, and T. Sakai eds., TransTech Pub., Zurich, pp. 1885-1890 (2003).
  11. B.C. Ng, T. R. Bieler, M. A. Crimp, "The Effect of Crystal Orientation on Crack Nucleation and Arrest in a Near-Gamma TiAl Alloy", Mechanisms and Mechanics of Fracture: The John Knott Symposium, eds, W.O. Soboyejo, J.J. Lewandowski, and R.O. Ritchie, TMS, Warrendale, PA, pp. 303-308 2002.
  12. B.C. Ng, "Effect of sample length on the strain distribution on straight tubes", GM R&D Report ESL-130, December 12, 2001.
  13. B.C. Ng, " Burst test evaluation on bent mild steel tubes using strain gages", GM R&D Report ESL-118, October 16, 2001.
  14. B.C. Ng,  "Characterization of 90 degrees bend mild steel tubes", GM R&D Report ESL-112, September 28, 2001.
  15. M.A. Crimp, B.A. Simkin and B.C. Ng, "Demonstration of the g.bxu=0 edge dislocation invisibility criterion for electron channeling contrast imaging", Phil. Mag. Letters, 2001, Vol. 81, No. 12, 833-837.
  16. B.A. Simkin, B.C. Ng and M.A. Crimp, "Imaging crystalline defects in the SEM by Electron Channeling Contrast, Microscopy and Analysis, May 1999, pp. 11-13.
  17. B.C. Ng, and M.A. Crimp, "Application of the Electron Channeling Contrast Imaging technique to the study of dislocations associated with cracks in bulk specimens", Ultramicroscopy 75 (1998) 137-145.
  18. B.C. Ng, B. Ghosh and M.A. Crimp, "Electron Channeling Contrast Imaging of dislocations near crack tips in bulk NiAl single crystals", Interstitial and Substitutional Effects in Intermetallics, 1998 TMS Proceedings, edited by I. Baker, R.D. Noebe and E.P. George, pp. 163-176.
  19. B.C. Ng, B.A. Simkin and M.A. Crimp, "Examination of dislocations structures near crack tip regions of B2 NiAl, "High-Temperature Ordered Intermetallics Alloys VII, edited by C.C. Koch, C.T. Liu, N.S. Stoloff, A. Wanner. Pp. 387-392 (1997).
  20. B.C. Ng, B.A. Simkin and M.A. Crimp, "Electron Channeling Contrast Imaging of dislocation structures in deformed stoichiometric NiAl",Mat. Sci. and Eng. A239-240 (1997) 150-156.
  21. B.C. Ng, B.A. Simkin and M.A. Crimp, "Examination of dislocations near crack tips in stoichiometric NiAl, "Deformation and Fracture of Ordered Intermetallics Materials III", edited by W.O. Soboyejo, T.S. Srivatsan and H.L. Fraser, TMS, pp. 337-348 (1996).
  22. D. Dorney, B.C. Ng and A. Ahabas,  "Numerical simulations of hot streak migration in a 1 1/2 stage turbine", AIAA, 95-0181 (1995).

 

 

 

 

Presentation:

·          B.C. Ng, T.R. Bieler and M.A. Crimp, D.E. Mason, "Prediction of crack paths based upon detailed microstructure characterization in a near-g-TiAl Alloy, Materials Damage Prognosis Edited by J.M .Larsen, J.R. Calcaterra, L. Christodoulou, M.L. Dent, W.J. Hardman, J.W. Jones, S.M. Russ, TMS (The Minerals, Metals & Materials Society),pp.307 –314, 2005.

·         B.C. Ng, T. R. Bieler, M. A. Crimp, D.E. Mason, "Twin Activity At The Crack Tip In Near-Gamma TiAl Using Electron Channeling Contrast Imaging". Gamma Titanium Aluminides 2003, eds Y.W. Kim et al, TMS, Warrendale, PA. 2004, pp. 503-508.

·        B.C. Ng, B. Ghosh and M.A. Crimp, "Electron Channeling Contrast Imaging of Dislocations Near Crack Tips in Bulk NiAl Single Crystals," Interstitial and Substitutional Effects in Intermetallics, 1998 TMS Fall Meeting, Rosement, Illinois, Oct 11-15, 1998

·        B.C. Ng, T. R. Bieler, M. A. Crimp, "The Effect of Crystal Orientation on Crack Nucleation and Arrest in a Near-Gamma TiAl Alloy", Mechanisms and Mechanics of Fracture: The John Knott Symposium, eds, W.O. Soboyejo, J.J. Lewandowski, and R.O. Ritchie, TMS, Warrendale, PA, pp. 303-308, 2002.

·        B.C. Ng, B.A. Simkin and M.A. Crimp, "Use of the Electron Channeling Contrast Imaging (ECCI) Technique to Image Dislocations Near Crack Tips and Crack Edges in Bulk Samples," TMS-ASM Materials Week 1997

·        B.C. Ng, B.A. Simkin and M.A. Crimp, "Examination of Dislocations Structures Near Crack Tips Region of B2 NiAl," High-Temperature Ordered Intermetallic Alloys VII, MRS Fall Meetings, 1996

·        B.C. Ng, B.A. Simkin and M.A. Crimp, "Examination of Dislocations Near Crack Tips in Stoichiometric NiAl," Deformation and Fracture of Ordered Intermetallics Materials III, TMS-ASM Materials Week 1996

 





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