Ph.D., Polytechnic Institute of New York, 1980
Physical and mechanical behavior of titanium alloys, stainless steels, and other structural materials, modeling microstructure evolution in multiphase systems, finite element modeling (FEM) of deformation and damping behavior of composite materials, biomedical implants.
Current Research Projects
Investigation of Thermal Aging Effects on the Evolution of Microstructure and Mechanical Properties of Cast Duplex Stainless Steels
This research will provide a better understanding of the microstructural evolution and simultaneous change in mechanical response during aging. The results of the research will provide data that can be used to estimate degraded mechanical properties for an 80-year service life of light water reactors. Download the abstract (PDF)
Graduate students interested in working in these areas ahould contact Professor S. Ankem at email@example.com.
The Study of Twinning and Oxygen Interstitial Interactions in Model Titanium Alloys
We study the interactions between twins and interstitial elements, such as oxygen, in model titanium alloys through the use of atomistic computational materials science techniques. In our current work, we are using Density Functional Theory (DFT) calculations in the Vienna Ab initio Simulation Package (VASP) combined with the Modified Embedded Atom Method (MEAM) calculations in Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) to study the structural and thermodynamic characteristics of oxygen interstitials at the twins. By combining energy barrier calculations, structural calculations, and experimental tests we are seeking to better understand how oxygen interstitials impact twin growth. This will permit the future development of titanium alloys with improved mechanical properties.
Professor Ankem regularly teaches or has taught the following courses:
- ENES 100: Introduction to Engineering Design
- ENMA 362: Mechanical Properties, with lab
- ENMA 461: Thermodynamics of Materials
- ENMA 464: Environmental Effects on Engineering Materials
- ENMA 471: Kinetics, Diffusion and Phase Transformations
- ENMA 472: Technology and Design of Engineering Materials
- ENMA 489A/698C: Design of Composite Materials
- ENMA 484/684: Advanced Finite Element Modeling (formerly 489F)
- ENRE 648L: Materials Selection and Mechanical Reliability
- ENMA 661: Kinetics of Reactions in Materials
Honors and Awards
- Fellow, American Society for Metals (FASM), 2001.
George Kimball Burgess Memorial Award, 1996-97.
This is the highest award given annually by the Washington, D.C. chapter of ASM International in recognition of outstanding achievements in research or administration in the materials field by a member in the Washington, D.C. chapter.
- ASM International Materials Science Division Research Award, 1990.
- ASM International—Indian Institute of Metals Lectureship, 1991.
- Alpha Sigma Mu, 1978.
- Sigma Xi, 1978.
- ASM International, 1976-present.
- American Institute of Metallurgical Engineers, 1976-present.
- Member, MSD/ASM Materials Processing Committee, 1984-present.
- Member, TMS Titanium Committee, 1982-present.
- Chairman, Scholarship Committee of ASM International, Washington D.C Chapter, 1993-Present.
- Chairman of TMS Titanium committee, 2007-Present.
Books and Chapters
"Microstructure- Property Relationships of Titanium Alloys," Edited by S. Ankem and J.A Hall, Proceedings of the Harold Margolin Symposium on Microstructure—Property Relationships of Titanium Alloys, 1994 TMS Annual Meeting. Published by TMS, 1995, ISBN No: 0-87339-246-9.
"Advances in Twinning," Edited by S. Ankem and C.S. Pande, Proceedings of the International Symposium on Advances in Twinning, 1999 TMS Annual Meeting, published by TMS, 1999, ISBN No. 0-87339-430-5.
"Science and Technology of Interfaces," Edited by S. Ankem, C. S. Pande, Ovidko, and S. Ranganathan, Proceedings of the International symposium on Science and Technology of interfaces in honor of Dr. Bhakta Rath, 2002, TMS Annual Meeting, Published by TMS, 2002, ISBN No. 0-87339-520-4. This book is also available in the form of a CD.
"Finite Element Analysis and celluar Studies on Advanced , Controlled Porous Structures with Subsurface Continuity in Bio-Implantable Titanium Alloys", P. Lambert, S. Ankem*, Z. Wyatt, K.M. Ferlin, J. Fisher, Journal of Biomedical Materials Research Part A, First Published online 17 May 2013. DOI: 10.1002/jbm.a.34684
"Deformation Mechanisms and Kinetics of Time-dependent Twinning in an Alpha Titanium Alloy", Z.W. Wyatt, W.J. Joost, D. Zhu, S. Ankem, International Journal of Plasticity, 39,119-131 (2012). DOI: 10.1016/j.ijplas.2012.06.001.
"Modeling interstitial diffusion controlled twinning in alpha titanium during low-temperature creep", P.G. Oberson, Z.W. Wyatt, S. Ankem, Scripta Materialia, Vol. 65, 2011, pp. 638 – 641. DOI: 10.1016/j.scriptamat.2011.06.049
"The Effect of Yttrium on Ti-5111 Gas Tungsten Arc Welds", B.W. Neuberger, P.G. Oberson, and S. Ankem*, Accepted for Publication in Metallurgical and Materials Transactions A, 2010, p. 25. DOI: 10.1007/s11661-010-0532-8.
"Recent Developments in Mechanisms and the Kinetics of Deformation Twinning in Titanium Alloys", Z. Wyatt and S. Ankem*, Material Science Forum, Proceedings of PRICM 7, DOI: 10.4028/www.scientific.net/MSF.654-656.863
"The effect of metastability on room temperature deformation behavior of β and α + β titanium alloys", Z. Wyatt and S. Ankem*, Journal of Materials Science, Proceedings of ICAM 2009, DOI: 10.1007/s10853-009-4178-0
"The effect of time-dependent twinning on low temperature (<0.25 * Tm) creep of an alpha-titanium alloy", P.G. Oberson and S. Ankem, International Journal of Plasticity, Volume 25, Issue 5, May 2009, Pages 881-900. DOI: 10.1016/j.ijplas.2008.06.002
"The Role of Deformation Twinning on Creep of Titanium Alloys", S. Ankem and P.G. Oberson, Materials Science Forum, Vols. 561-565, 2007, 121-126. 10.4028/www.scientific.net/MSF.561-565.121
"Influence of the Second Phase on the Room Temperature Tensile and Creep Deformation Mechanisms of α-β Titanium Alloys-Part II: Creep Deformation", A. Jaworski, Jr., S. Ankem*, Metallurgical and Materials Transactions A, Vol. 37A, 2006, pp. 2755-65.DOI: 10.1007/BF02586108
"Influence of the Second Phase on the Room Temperature Tensile and Creep Deformation Mechanisms of α-β Titanium Alloys-Part I: Tensile Deformation", A. Jaworski, Jr., S. Ankem*, Metallurgical and Materials Transactions A, Vol. 37A, 2006, pp. 2739-54.DOI: 10.1007/BF02586107
"Mechanical Properties of Alloys Consisting of Two Ductile Phases", S. Ankem*, H. Margolin, C. Greene, B. Neuberger, P. Oberson. Progress in Materials Science, Vol. 51, 2006, pp. 632-709. DOI: 10.1016/j.pmatsci.2005.10.003
"The Effect of Alpha Phase on the Deformation Mechanisms of Beta Titanium Alloys", A. Jaworski, Jr., S. Ankem*, Jour. of Mat. Eng. and Performance, Vol. 6, 2005, pp. 755-60. DOI: 10.1361/105994905X75565
"Why Twins Do Not Grow at the Speed of Sound All the Time", P.G. Oberson, S. Ankem*, Physical Review Letters, Vol. 95, 2005, article no. 165501, pp.165501, 1-4. DOI: 10.1103/PhysRevLett.95.165501
"Recent Developments in Processing/Structures/Properties Relationships of Titanium Alloys", P.G. Oberson, and S. Ankem, Keynote Presentation at the International Conference for Professing Materials for Properties held in conjunction with the TMS 2010 Annual Meeting, Seattle, Washington, February 15-18, 2010.
"Recent Advances in Kinetics of Deformation Twinning in Titanium Alloys", S. Ankem, Z. Wyatt, and R. Mulholland, Presented at the International Symposium on Plasticity 2010, Jan 3-8, 2010, St. Kitts.
"The Effect of Metastability on Room Temperature Deformation Behavior of Beta Titanium Alloys", S. Ankem and Z. Wyatt, Presented at ICAM 2009, September 20 – 25, 2009, Rio De Janeiro, Brazil.
Invited Keynote Presentation: "Recent Developments on the Role of Interfaces on Deformation Behavior of Two-Phase Alloys", S. Ankem, G. Oberson and Z. Wyatt, Presented at the International Symposium on Plasticity 2009, January 3-8, 2009, St. Thomas, U.S. Virgin Islands.
"Recent Developments in Mechanisms and the Kinetics of Deformation Twinning in Titanium Alloys", S. Ankem, & Z. Wyatt, PRICM 7, August 2010, Cairns, Austrilia.
Invited Keynote Presentation: "Recent Advances in Twinning," S. Ankem and P.G. Oberson, Presented at the "International Symposium on Plasticity," January 3-8, 2008, Kona, Hawaii.
"The Role of Deformation Twinning on Creep of Titanium Alloys," S. Ankem and P.G. Oberson, Presented at "The 6th Pacific Rim International Conference on Advanced Materials and Processing," November 5-9, 2007, Jeiu Island, Korea.
Invited presentation "The Role of Twinning on the Room Temperature Creep Behavior of Titanium Alloys," S. Ankem and P.G. Oberson, Presented at the "11th World Conference on Titanium," June 3-7, 2007, Kyoto, Japan.
Invited keynote presentation "Recent Developments in the Ambient Temperature Creep Deformation Behavior of α and α-β Titanium Alloys," S. Ankem and P. G. Oberson, Presented at the "Indo-US workshop on Recent Advances on Microstructure, Texture, and Property Relations in Close Packed Materials," December 28-30, 2005, Visakhapatnam, India.
Invited presentation on nanostructures of bulk materials at International Conference of Nanomaterials and Nanotechnologies (NN2005), June 14-18, 2005, Crete, Greece.
"Advances in Ambient Temperature Creep Deformation Behavior of Two-Phase Titanium Alloys," A. Jaworski Jr. and S. Ankem, Proceedings of the 5th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-5, November 2-5, 2004, Beijing, China.