Ralph Napolitano

Title(s):

Professor
Associate Chair
Materials Science and Engineering

Office

3273 Gilman Hall
Iowa State University
Ames, IA 500111096

Office

2220BC Hoover (mail address) # Ames, IA 50011-2300 # Phone: 515-294-9101

Publications

1.     Saptarshi, S, DeJong, M, Rock, C, Anderson, I, Napolitano, R,  [4] ; Forrester, J.,Lapidus, S., Kaoumi, D., Horn, T.; Laser Powder Bed Fusion of ODS 14YWT from Gas Atomization Reaction Synthesis Precursor Powders, J. Metals 22 (2022) 3303-3315.

2.     T. Horn, C. Rock, D. Kaoumi, I Anderson, E. White, T Prost, J. Rieken, S Saptarshi, R. Schoel, M. DeJong, S. Timmins, J. Forrester, S. Lapidus, R. Napolitano, D. Zhang, J. Darsell, Laser powder bed fusion additive manufacturing of oxide dispersion strengthened steel using gas atomized reaction synthesis powder, Materials & Design 216 (2022) 110574.

3.     S. Saptarshi, M Dejong, C. Rock, I. Anderson, R. Napolitano, J. Forrester, S. Lapidus, D. Kaoumi, T. Horn, Laser powder bed fusion of ODS 14YWT from gas atomization reaction synthesis precursor powders, JOM 74 (2022) 3303-3315.

  1. R.E. Napolitano, S. Jain, C. Sobczak, B.A. Augustine, E.M. Johnson, Build optimization for selective laser melting of 316L stainless steel and parameterization for cross-material comparison and process design, J. of Materi. Eng. and Perform., (2021). Doi.org/10.1007/s11665-021-05861-7.
  2. Senlin Cui, Matthew Lynn, Ralph E. Napolitano**, Experimental investigation and thermodynamic modeling of the binary Pt-Sn system, J. Alloys and Compounds 854 (2021) 157064.
  3. Senlin Cui, Jian Wang, Zhimin Yu, Ralph E. Napolitano**, Critical evaluation and thermodynamic modeling of the Pd–Sn system, Intermetallics 126 (2020) 106945. 
  4. F.Q. Meng, S.H. Zhou, R.T. Ott, M.J. Kramer, R. E. Napolitano**, Competitive devitrification and metastable phase selection in Al-Sm, Materialia 9 (2020) 100595.
  5. S.H. Zhou, F.Q. Meng, M.J. Kramer, R.T. Ott, F. Zhang, Z. Ye, S. Jain, R. E. Napolitano**, Metastable intermetallic phases in the Al-Sm system, Materials Today Communications 21 (2019) 1000673, 1-12.
  6. Z. Ye, F. Meng, F. Zhang, Y. Sun, L.Yang,  S.H. Zhou, R.E. Napolitano, M.I. Mendelev, R.T. Ott, M.J. Kramer, C.Z. Wang, K.M. Ho**, Observation of eta-Al41Sm5 reveals motif-aware structural evolution in Al-Sm alloys, Sci. Rep. 9 (2019) 6692.
  7. R. E. Napolitano**, S.H. Zhou, X. Yang, F.Q. Meng; Experimental determination of the allotropic transition temperature between tetragonal and orthorhombic Al4Sm metastable phases, Met. Mat. Trans. A, 50 (2019) 1130-1136.  
  8. L. Zhou**, F.Q. Meng, S.H. Zhou, K.W. Sun, T. Kim, R. Ott, R. E. Napolitano, M.J. Kramer, An abnormal metastable nanoscale eutectic reaction revealed by in-situ observation, Acta Materialia, 164 (2019) 697-703. 
  9. L. Zhou, F. Meng, S. Zhou, K. Sun, T.-H. Kim, T.T. Ott, R. E. Napolitano, M.J. Kramer**, Tracking metastable phase selection during devitrification in a metallic glass, Microsc. Microanal. 25 (Suppl 2) 2019. Doi:10.1017/S1431927619010109.
  10. Ravi Tutika, S.H. Zhou, R.E. Napolitano, M.D. Bartlett**, Mechanical and functional tradeoffs in multiphase liquid metal, solid particle soft composites, Adv. Functional Materials (2018) 1804336, pp. 1-13.
  11. Ye. Z, Zhang, F., Sun, Y., Nguyen, M.C., Zhou, S.H., Zhou, L., Meng, F., Ott, R.T. Park, E. Besser, M.F., Kramer, M.J., Ding, Z.J., Mendelev, M.I., Wang, C.Z., Napolitano, R.E., Ho. K.M.**, Structural hierarchy as a key to complex phase selection in Al-Sm, Phys. Rev. Materials 1 (2017) 055601.
  12. Shihua Zhou, Carl Tackes, Ralph Napolitano**; Enthalpy of mixing in Al-Tb liquid, Entropy, 19 (6), (2017) 290.   DOI: 10.3390/e19060290.
  13. I. Sargin, A. L. Genau, and R. E. Napolitano**, Post-solidification effects in directionally grown Al-Ag2Al-Al2Cu eutectics, J. Phase Equilibrium and Diffusion, 37 (2016) 75-85.
  14. S.H. Zhou, Y. Huo, and Ralph E. Napolitano**, Phase stability for the Pd-Si system: First principles, experiments, and solution-based modeling, Metallurgical and Materials Transactions A, 47A (2016) 194-208.  DOI: 10.1007/s11661-015-3206-8.
  15. Ilkay Kalay, Matthew J. Kramer, Ralph E. Napolitano**; Crystallization kinetics and phase transformation mechanisms in Cu56Z44 glassy alloy, Metallurgical and Materials Transactions, 46A (2015) 3356-3364.  DOI: 10.1007/s11661-015-2921-5.
  16. T. Wang, F. Zhang, L. Yang, X.W. Fang, S.H. Zhou, M.J. Kramer, C.Z. Wang, K.M. Ho, R. E. Napolitano**; A computational study of diffusion in a glass-forming metallic liquid, Scientific Reports, 5:10956 (2015) 1-9. DOI:10.1038/srep10956.
  17. Tim Cullinan, Ilkay Kalay, Y. Eren Kalay, Matt Kramer, Ralph Napolitano**; Kinetics and mechanisms of isothermal devitrification in Amorphous Cu50Zr50, Metallurgical and Materials Transactions, 46A (2015) 600-613. DOI: 10.1007/s11661-014-2661-y.
  18. F. Zhang, M. Ji, X. Fang, C.Z. Wang, M.J. Kramer, R.E. Napolitano, K.M. Ho**; Composition dependent stability of the medium-range order responsible for metallic glass formation, Acta Materialia 81 (2014) 337-344.
  19. S. Zhou, Y. Huo, L.-Q. Chen, R.E. Napolitano**; Solution-based thermodynamic modeling of the Ni-Al-Mo system using first principles calculations, CALPHAD 46 (2014) 124-133.
  20. Tao Wang, T.E. Cullinan, R.E. Napolitano**, A new method for measuring the thermodynamic properties of undercooled liquid and amorphous Cu-Zr alloys, Acta Materialia 62 (2014) 188-196. DOI: 10.1016/j.actamat.2013.09.047.
  21. Z.L. Royer, C. Tackes, R. LeSar, and R.E. Napolitano**, “Coil optimization for electromagnetic levitation using a genetic like algorithm,” J. Appl. Physics, 113 (2013) 214901. DOI: 10.1063/1.4807788. 
  22. Wang T. and Napolitano R. E.**, “A phase-field model for phase transformations in glass-forming alloys”,  Metall. Mater. Trans. A 43A (2012) 2662-2668. DOI 10.1007/s11661-012-1136-2.
  23. R. E. Napolitano** and Melis Serefoglu, “Control and interpretation of finite-size effects and initial morphology in directional solidification of a rod-type eutectic transparent metal-analog,” Journal of Metals 64 (2012) 68-75. DOI: 10.1007/s11837-011-0214-z.
  24. X.W. Fang, C.Z. Wang, S.G. Hao, M.J. Kramer, Y.X. Yao, M.I. Mendelev, Z.J. Ding, R. E. Napolitano, K.M. Ho**; “Spatially resolved distribution function and the medium-range order in metallic liquid and glass,” Scientific Reports, 1 (2011) 194. DOI: 10.1038/srep00194.
  25. S.G. Hao, C.Z. Wang, M.Z. Li, R.E. Napolitano, “Dynamic Arrest and Glass Formation Induced by Self-Aggregation of Icosahedral Clusters in Zr1-xCux Alloys,” Physical Review B 84 (2011) 064203.
  26. Melis Serefoglu, R.E. Napolitano, Mathis Plapp, “Phase-field investigation of rod eutectic morphologies under geometrical confinement,” Physical Review E 84(1) (2011) 011614. URL: http://link.aps.org/doi/10.1103/PhysRevE.84.011614, [doi: 10.1103/PhysRevE.84.011614].
  27. I. Kalay, M. J. Kramer, R. E. Napolitano**,  “High-accuracy X-ray diffraction analysis of phase evolution sequence during devitrification of Cu50Zr50 metallic glass”, Met. Mat. Trans. 42A  (2011) 1144-1153. [doi: 10.1007/s11661-010-0531-9]
  28. Melis Serefoglu and R.E. Napolitano**, “On the role of initial conditions in the selection of eutectic onset mechanisms in directional growth,” Acta Materialia 59 (2011) 1048-1057. [doi:10.1016/j.actamat.2010.10.035]
  29. M.J. Kramer, M.I. Mendelev and R.E. Napolitano**, “In situ observation of antisite defect formation during crystal growth,” Physical Review Letters, 105 (2010) 245501 (2010). [doi: 10.1103/PhysRevLett.105.245501].
  30. T. Hosch and R.E. Napolitano**, “The effect of the flake-fiber transition in silicon morphology on the tensile properties of Al-Si eutectic alloys,” Mater. Sci. Eng. A 528 (2010) 226-232. [doi:10.10.1016/j.msea.2010.09.008]
  31. S.G. Haoa, , , C.Z. Wanga, Maozhi Lib, a, R.E. Napolitanoa,s M.I. Mendeleva and K.M. Ho, “Prediction of cooling rate dependent ordering in metallic glass transition using a two-state model,” Computational Materials Science 49 (2010) 615-618. [doi:10.1016/j.commatsci.2010.06.002]
  32. Y. Yao, R. Napolitano, C.Z. Wang, and K.M. Ho, “Thermodynamic limits of crystallization and the prediction of glass formation tendency”, Phys. Rev. B. 81 (2010) 212202. [doi: 10.1103/PhysRevB.81.212202]
  33. S. H. Zhou and R. E. Napolitano, Phase stability for the Cu-Zr system: First principles, experiments, and solution-based modeling, Acta Mater. 58 (2010) 2186-2196. [doi: 10.1016/j.actamat.2009.12.004]
  34. S. H. Zhou, Y. Wang, L.Q. Chen, Z.K. Liu, and R. E. Napolitano, Solution-based thermodynamic modeling of the Ni-Ta and Ni-Mo-Ta systems using first principles calculations, Calphad 33 (2009) 631-641.  [doi:10.1016/j.calphad.2009.06.006 ]
  35. T. Hosch, L.G. England, and R.E. Napolitano, Analysis of the high growth-rate transition in Al-Si eutectic solidification, J. Mat. Sci. 44 (2009) 4892-4899. [doi:10.1007/s10853-009-3747-6]
  36. Melis Serefoglu and R.E. Napolitano , “Onset of rod eutectic morphology in directional solidification” J. Cast Met. Res. 22 (2009) 228-231. [doi:10.1179/136404609X367795]
  37. M.D. Asta, C. Beckermann, A. Karma, W. Kurz, R. Napolitano, M. Plapp, G. Purdy, M. Rappaz, R. Trivedi, “Solidification microstructures and solid-state parallels: Recent developments, future directions”, Acta Mater. 57 (2009) 941-971. [doi: 10.1016/j.actamat.2008.10.020]
  38. S. H. Zhou and R. E. Napolitano, Energetics of nonequilibrium solidification in Al-Sm, Phys. Rev. B  78 (2008) 184111. [doi: 10.1103/PhysRevB.78.184111]
  39. S. H. Zhou and R. E. Napolitano, “Identification of the B33 martensite phase in Cu-Zr using first-principles and X-ray diffraction”, Scripta Materialia 59 (2008) 1143-1146. [doi: 10.1016/j.scriptamat.2008.07.040]
  40. Melis Serefoglu and R.E. Napolitano, “On the selection of rod-type eutectic morphologies: Geometrical constraint and array orientation”, Acta Materialia 56 (2008) 3862-3873. [doi:10.1016/j.actamat.2008.02.050]
  41. S.H. Zhou and R.E. Napolitano, “Modeling of thermodynamic properties and phase equilibria for the Al-Sm binary system”, Met .Mat. Trans. A 39 (2008) 502-512. [doi: 10.1007/s11661-007-9445-6]
  42. M.J. Kramer, H. Meco, K.W. Dennis, E. Vargonova, R.W. McCallum, and R.E. Napolitano, “Rapid solidification and metallic glass formation – Experimental and theoretical limits”, J. Noncrystalline Solids  353 (2007) 3633-3639. [doi: 10.1016/j.jnoncrysol.2007.05.172]
  43. S.H. Zhou and R.E. Napolitano, “Thermodynamic treatment of undercooled Cu-Mg liquid and the limits for partitionless crystallization”, J. Phase Equil. Diff. 28/4 (2007) 328-334. [doi: 10.1007/s11669-007-9083-0]
  44. Y.E. Kalay, L.S. Chumbley, I.E. Anderson, R.E. Napolitano, “Characterization of Hypereutectic Al-Si powders solidified under far from equilibrium conditions”, Metallurgical and Materials Transactions A 38 (2007) 1452-1457. [doi: 10.1007/s11661-007-9168-8]
  45. S.H. Zhou and R.E. Napolitano, “The stability of Al11Sm3 compounds, Metallurgical and Materials Transactions A 38 (2007) 1145-1151. [doi: 10.1007/s11661-007-9148-z]
  46. S. Zhou,  Y. Wang, F.G. Shi, F. Sommer, L.Q. Chen, Z.K. Liu, and R.E. Napolitano, “Modeling of thermodynamic properties and phase equilibria for the Cu-Mg binary system”, J. Phase Equil. Diff. 28/2 (2007) 158-166. [doi: 10.1007/s11669-007-9022-0]
  47. H. Meco and R.E. Napolitano, “Non-equilibrium solute partitioning and microstructure formation in rapidly solidified Al-Sm alloys”, Mat. Sci. Forum 539-543 (2007)  2810-2815.
  48. R.E. Napolitano and J.R. Morris, “Frontiers in Solidification Science: Preface to the special issue”, Phil. Mag. 86 (2006) 3647-3649. [doi: 10.1080/14786430600752992]
  49. S. Zhou and R.E. Napolitano, “Phase equilibria and thermodynamic limits for partitionless crystallization in the Al-La binary system, Acta Materialia, 54 (2006) 831-840. DOI: 10.1016/j.actamat.2005.10.013.
  50. H. Meco and R. E. Napolitano, “Liquidus and solidus boundaries in the vicinity of order-disorder transitions in the Fe-Si system”, Scripta Materialia, 52 (2005)  221-226.
  51. H. Meco and R.E. Napolitano, “Upper bound velocity limit for free-jet melt spinning”, Mat. Sci. Forum, 475-479 (2005) 3371. 

55.    R.E. Napolitano and D.R. Black, “Array ordering in dendritic crystals and the influence on crystal perfection”, J. Mat. Science 39 (2004) 1-9.

  1. J.J. Hoyt, M. Asta, T. Haxhimali, A.Karma, R.E. Napolitano, R. Trivedi, B. Laird, and J.R. Morris, “Crystal-melt interfaces and solidification morphologies in metals and alloys”, MRS Bulletin, 29 (2004) 935-939.
  2. R.E. Napolitano and S. Liu, “Three-dimensional crystal-melt Wulff-shape and interfacial stiffness in the Al-Sn binary system”, Phys. Rev. B 70 (2004) 2141031.
  3. R.E. Napolitano and H. Meco, “The role of melt-pool behavior in free-jet melt spinning”, Met. Mat. Trans. 35A (2004) 1539-1553.
  4. R.E. Napolitano, H. Meco, C. Jung, “Faceted solidification morphologies in Al-Si eutectics at low growth rates”, J. Metals 56(4) (2004) 16-21.
  5. J.R. Morris and R.E. Napolitano, “Developments in approaches to determining the anisotropy of the solid-liquid interfacial free energy”, J. Metals 56(4) (2004) 40-44.
  6. R.E. Napolitano, S. Liu, and R. Trivedi, “Experimental measurement of anisotropy in crystal-melt interfacial energy”, Interface Science 10 (2002) 217-232.
  7. S. Liu, R.E. Napolitano, and R. Trivedi, “Measurement of anisotropy of crystal-melt interfacial energy for a binary Al-Cu alloy”, Acta Mater. 49 (2001) 4271.
  8. R.E. Napolitano and R.J. Schaefer, “The convergence-fault mechanism for low-angle boundary formation in single-crystal castings”, J. Mat. Science, 35 (2000) 1641.

Primary Strategic Research Area

Advanced Materials & Manufacturing

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