Journal Papers (accepted and in press)

62.      W.D. Li, H. Bei^*, J. Qu, Y.F. Gao^*, "Effects of machine stiffness on the load-displacement curve during spherical nano-indentation." Journal of Materials Research, accepted in May 2013.

61.      J. Kwon, M.C. Brandes, P. Sudharshan Phani, A.P. Pilchak, Y.F. Gao, E.P. George, G.M. Pharr, M.J. Mills^*, "Characterization of deformation anisotropies in an alpha-Ti alloy by nanoindentation and electron microscopy." Acta Materialia, accepted in May 2013.

Journal Papers (published)

2013

60.      C.H. Yu, C.W. Huang, C.S. Chen, Y.F. Gao, C.H. Hsueh^*, "A micromechanics study of competing mechanisms for creep fracture of zirconium diboride polycrystals." Journal of the European Ceramic Society, vol. 33, iss. 10, pp. 1625-1637, September 2013 [DOI].

59.      D. Catoor^*, Y.F. Gao, J. Geng, M.J.N.V. Prasad, E.G. Herbert, K.S. Kumar, G.M. Pharr, E.P. George, "Incipient plasticity and deformation mechanisms in single-crystal Mg during spherical nanoindentation." Acta Materialia, vol. 61, iss. 8, pp. 2953-2965, May 2013 [DOI].

58.      S.H. Wee, Y.F. Gao, Y.L. Zuev, K.L. More, J.Y. Meng, J.X. Zhong, G.M. Stocks, A. Goyal^*, "Self-assembly of nanostructured, complex, multication films via spontaneous phase separation and strain-driven ordering." Advanced Functional Materials, vol. 23, pp. 1912-1918, April 2013 [DOI].

57.      L.L. Zheng, Y.F. Gao^*, Y.D. Wang, A.D. Stoica, K. An, X.L. Wang, "Grain orientation dependence of lattice strains and intergranular damage rates in polycrystals under cyclic loading." Scripta Materialia, vol. 68, iss. 5, pp. 265-268, March 2013 [DOI].

2012

56.      W. Wu, S.Y. Lee^*, A.M. Paradowska, Y.F. Gao, P.K. Liaw, "Twinning-detwinning behavior during fatigue-crack propagation in a wrought magnesium alloy AZ31B." Materials Science and Engineering A, vol. 556, pp. 278-286, October 2012 [PDF] [DOI].

55.      T.L. Li, H. Bei, J.R. Morris, E.P. George, Y.F. Gao^*, "Scale effects in the convoluted thermal/spatial statistics of plasticity initiation in small stressed volumes during nanoindentation." Materials Science and Technology (invited), special issue in: Hardness across the Multi-Scales of Structure and Loading Rate (edited by R. Armstrong et al.), vol. 28, no. 9-10, pp. 1055-1059, 2012 [PDF] [DOI].

54.      C.H. Yu, C.W. Huang, C.S. Chen, Y.F. Gao, C.H. Hsueh^*, "Effects of grain boundary heterogeneities on creep fracture studied by rate-dependent cohesive model." Engineering Fracture Mechanics, vol. 93, pp. 48-64, October 2012 [PDF] [DOI].

53.      J.H. Lee, Y.F. Gao^*, K.E. Johanns, G.M. Pharr, "Cohesive interface simulations of indentation cracking as a fracture toughness measurement method for brittle materials." Acta Materialia, vol. 60, iss. 15, pp. 5448-5467, 2012 [PDF] [DOI].

52.      Z.N. An, W.D. Li, F.X. Liu, P.K. Liaw, Y.F. Gao^*, "Interface constraints on shear band patterns in bonded metallic glass films under micro-indentation." Metallurgical and Materials Transactions A, vol. 43, iss. 8, pp. 2729-2741, 2012 [PDF] [DOI].

51.      M.C. Liu, J.C. Huang^*, K.W. Chen, J.F. Lin, W.D. Li, Y.F. Gao, T.G. Nieh, "Is the compression of tapered micro and nanopillar samples a legitimate technique for the identification of deformation mode change in metallic glasses?" Scripta Materialia, vol. 66, iss. 10, pp. 817-820, 2012 [PDF] [DOI].

50.      S.Y. Huang, D.W. Brown, B. Clausen, Z.K. Teng, Y.F. Gao, P.K. Liaw^*, "In situ neutron-diffraction studies on the creep behavior of a ferritic superalloy." Metallurgical and Materials Transactions A, vol. 43, no. 5, pp. 1497-1508, 2012 [PDF] [DOI].

49.      J.H. Lee, Y.F. Gao^*, G.M. Pharr, "Effective Poisson's ratio from combined normal and lateral contacts of single crystals." Journal of Materials Research, vol. 27, iss. 1, pp. 182-191, 2012 [PDF] [DOI].

2011

48.      L. Wang, H. Bei, Y.F. Gao, Z.P. Lu, T.G. Nieh^*, "Effect of residual stresses on the onset of yielding in a Zr-based metallic glass." Acta Materialia, vol. 59, iss. 20, pp. 7627-7633, 2011 [PDF] [DOI].

47.      L.L. Zheng, Y.F. Gao^*, S.Y. Lee, R.I. Barabash, J.H. Lee, P.K. Liaw, "Intergranular strain evolution near fatigue crack tips in polycrystalline metals." Journal of the Mechanics and Physics of Solids, vol. 59, iss. 11, pp. 2307-2322, 2011 [PDF] [DOI].

46.      J. Annett, Y.F. Gao^*, G.L.W. Cross^*, E.G. Herbert, B.N. Lucas, "Mesoscale friction anisotropy revealed by slidingless tests." Journal of Materials Research, vol. 26, no. 18, pp. 2373-2378, 2011 [PDF] [DOI].

45.      C. Cantoni^*, Y.F. Gao, S.H. Wee, E.D. Specht, J. Gazquez, J.Y. Meng, S.J. Pennycook, A. Goyal, "Strain-driven oxygen deficiency in self-assembled, nanostructured, composite oxide films." ACS Nano, vol. 5, iss. 6, pp. 4783-4789, 2011 [DOI].

44.      L. Wang, H. Bei, T.L. Li, Y.F. Gao, E.P. George, T.G. Nieh^*, "Determining the activation energies and slip systems for dislocation nucleation in body-centered cubic Mo and face-centered cubic Ni single crystals." Scripta Materialia, vol. 65, pp. 179-182, 2011 [PDF] [DOI].

43.      T.L. Li, Y.F. Gao^*, H. Bei, E.P. George, "Indentation Schmid factor and orientation dependence of nanoindentation pop-in behavior of NiAl single crystals." Journal of the Mechanics and Physics of Solids, vol. 59, pp. 1147-1162, 2011 [PDF] [DOI].

42.      Y.F. Gao^*, L. Wang, H. Bei, T.G. Nieh, "On the shear band direction in metallic glasses." Acta Materialia, vol. 59, pp. 4159-4167, 2011 [PDF] [DOI].

41.      R.I. Barabash^*, H. Bei, G.E. Ice, Y.F. Gao, O.M. Barabash, "3D x-ray strain microscopy in two-phase composites at submicron length scales." JOM (invited), vol. 63, no. 3, pp. 30-34, March 2011 [LINK].

40.      L. Wang, H. Bei, Y.F. Gao, Z.P. Lu, T.G. Nieh^*, "Effect of residual stresses on the hardness of bulk metallic glasses." Acta Materialia, vol. 59, pp. 2858-2864, 2011 [PDF] [DOI].

39.      R.I. Barabash^*, H. Bei, Y.F. Gao, G.E. Ice, "Interface strength in NiAl-Mo composites from 3D x-ray microdiffraction." Scripta Materialia, vol. 64, iss. 9, pp. 900-903, 2011 [PDF] [DOI].

38.      J.H. Lee, Y.F. Gao^*, "Mixed-mode singularity and temperature effects on dislocation nucleation in strained interconnects." International Journal of Solids and Structures, vol. 48, pp. 1180-1190, 2011 [PDF] [DOI].

2010

37.      Y.F. Gao^*, "A Peierls perspective on mechanisms of atomic friction." Journal of the Mechanics and Physics of Solids, vol. 58, iss. 12, pp. 2023-2032, 2010 [PDF] [DOI].

36.      R.I. Barabash^*, Y.F. Gao, G.E. Ice, O.M. Barabash, J.-S. Chung, W. Liu, R. Kroeger, H. Lohmeyer, K. Sebald, J. Gutowski, T. Boettcher, D. Hommel, "Mapping strain gradients in the FIB-structured InGaN/GaN multilayered films with 3D x-ray microbeam." Materials Science and Engineering A, special issue in Probing Strains and Dislocation Gradients with Diffraction, vol. 528, iss. 1, pp. 52-57, 2010 [PDF] [DOI].

35.      R.I. Barabash^*, H. Bei, Y.F. Gao, G.E. Ice, "Indentation-induced localized deformation and elastic strain partitioning in composites at submicron length scale." Acta Materialia, vol. 58, iss. 20, pp. 6784-6789, 2010 [PDF] [DOI].

34.      G.M. Pharr^*, E.G. Herbert, Y.F. Gao, "The indentation size effect: a critical examination of experimental observations and mechanistic interpretations." Annual Review of Materials Research (invited), vol. 40, pp. 271-292, June 2010 [LINK].

33.      C.J. Su, J.A. LaManna, Y.F. Gao^*, W.C. Oliver, G.M. Pharr, "Plastic instability in amorphous selenium near its glass transition temperature." Journal of Materials Research, vol. 25, no. 6, pp. 1015-1019, June 2010 [PDF] [DOI].

32.      Y. Yang^*, J. Ye, J. Lu, Y.F. Gao, P.K. Liaw, "Metallic glasses: gaining plasticity for microsystems." JOM (invited), vol. 62, no. 2, pp. 93-98, February 2010 [LINK] [DOI].

31.      S. Zheng, W. Zhu, Y.F. Gao, G.M. Stocks, Z. Zhang^*, "Kinetic Monte Carlo simulations of nanocolumn formation in two-component epitaxial growth." Applied Physics Letters, 96, 071913, 2010 [PDF] [DOI] [LINK].

30.      R.I. Barabash^*, H. Bei, Y.F. Gao, G.E. Ice, E.P. George, "3D x-ray microscope investigation of local dislocation densities and elastic strain gradients in a NiAl-Mo composite and exposed Mo micropillars as a function of pre-strain." Journal of Materials Research (invited), 25, 199-206, 2010 [PDF] [Erratum] [DOI].

2009

29.      T.L. Li, J.H. Lee, Y.F. Gao^*, "An approximate formulation of the effective indentation modulus of elastically anisotropic film-on-substrate systems." International Journal of Applied Mechanics (invited), special issue in Theoretical and Computational Nanomechanics (edited by P. Sharma), 1, 515-525, 2009 [LINK] [DOI].

28.      F.X. Liu^*, F.Q. Yang, Y.F. Gao, W.H. Jiang, Y.F. Guan, P.D. Rack, O. Sergic, P.K. Liaw "Micro-scratch study of a magnetron-sputtered Zr-based metallic-glass film." Surface & Coatings Technology, 203, 3480-3484, 2009 [PDF] [DOI].

27.      T.L. Li, J.H. Lee, Y.F. Gao^*, G.M. Pharr, M. Huang, T.Y. Tsui, "Geometric effects on dislocation nucleation in strained electronics." Applied Physics Letters, 94, 171905, 2009 [PDF] [DOI] [LINK].

2008

26.      Y.F. Gao^*, J.Y. Meng, A. Goyal, G.M. Stocks, "Spatial ordering and anisotropy in surface stress domains and nanostructural evolution." JOM (invited), vol. 60, no. 9, pp. 54-58, September 2008 [LINK] [DOI].

25.      R. Barabash^*, Y.F. Gao, Y. Sun, S. Lee, H. Choo, P.K. Liaw, D.W. Brown, G.E. Ice, "Neutron and x-ray diffraction studies and cohesive interface model of the fatigue crack deformation behavior." Philosophical Magazine Letters, 88(8), 553-565, 2008 [PDF] [DOI].

24.      Y.F. Gao^*, H.H. Yu, K.-S. Kim, "Micro-plasticity of surface steps under adhesive contact: Part II - Multiple-dislocation mediated contact loading." Journal of the Mechanics and Physics of Solids, 56, 2759-2772, 2008 [PDF] [DOI].

23.      F.X. Liu, Y.F. Gao^*, P.K. Liaw, "Rate-dependent deformation behavior of Zr-based metallic-glass coatings examined by nanoindentation." Metallurgical and Materials Transactions A, 39, 1862-1867, 2008 [PDF] [DOI].

22.      Y.F. Gao^*, H.T. Xu, W.C. Oliver, G.M. Pharr, "A comparison of Coulomb friction and friction stress models based on multidimensional nanocontact experiments." Trans. of ASME, Journal of Applied Mechanics, 75, 034504, 2008 [PDF] [LINK] [DOI].

21.      Y.F. Gao^*, J. Lou, "Dislocation nucleation and pileup under a wedge contact at nanoscale." Journal of Nanomaterials (invited), special issue in: Nanomechanics and Nanostructured Multifunctional Materials: Experiments, Theories and Simulations (edited by J. Wang and J. Lou), Article ID 380961, 2008 [PDF] [LINK] [DOI].

20.      H. Bei, Y.F. Gao^*, S. Shim, E.P. George, G.M. Pharr, "Strength differences arising from homogeneous versus heterogeneous dislocation nucleation." Physical Review B, 77, 060103(R), February 29, 2008 [PDF] [LINK] [DOI].

19.      Y.F. Gao^*, H.T. Xu, W.C. Oliver, G.M. Pharr, "Effective elastic modulus of film-on-substrate systems under normal and tangential contact." Journal of the Mechanics and Physics of Solids, 56, 402-416, 2008 [PDF] [DOI].

2007

18.      F.X. Liu^*, P.K. Liaw, W.H. Jiang, C.L. Chiang, Y.F. Gao, Y.F. Guan, J.P. Chu, P.D. Rack, "Fatigue-resistance enhancements by glass-forming metallic films." Materials Science and Engineering A, 468-470, pp. 246-252, 2007 [PDF] [DOI].

17.      Y.F. Gao^*, G.M. Pharr, "Multidimensional contact moduli of elastically anisotropic solids." Scripta Materialia, 57, 13-16, 2007 [PDF] [DOI].

16.      S.M. Xia, Y.F. Gao^*, A.F. Bower, L.C. Lev, Y.-T. Cheng, "Delamination mechanism maps for a strong elastic coating on an elastic-plastic substrate subjected to contact loading." International Journal of Solids and Structures, 44, 3685-3699, 2007 [PDF] [DOI].

15.      Y.F. Gao^*, B. Yang, T.G. Nieh, "Thermomechanical instability analysis of inhomogeneous deformation in amorphous alloys." Acta Materialia, 55, 2319-2327, 2007 [PDF] [DOI].

14.      C. Fan^*, Y.F. Gao, H.Q. Li, H. Choo, P.K. Liaw, A. Inoue, C.T. Liu, "Mechanical behavior of a Zr-based bulk metallic glass and its composite at cryogenic temperatures." Journal of Materials Research, 22, 445-452, 2007.

13.      H.H. Yu, P. Shrotriya, Y.F. Gao, K.-S. Kim^*, "Micro-plasticity of surface steps under adhesive contact: Part I, surface yielding controlled by single-dislocation nucleation." Journal of the Mechanics and Physics of Solids, 55, 489-516, 2007 [PDF] [DOI].

2006

12.      C. Fan^*, P.K. Liaw, T.W. Wilson, H. Choo, Y.F. Gao, C.T. Liu, Th. Proffen, J.W. Richardson, "Pair distribution function study and mechanical behavior of as-cast and structurally relaxed Zr-based bulk metallic glasses." Applied Physics Letters, 89, 231920, 2006 [PDF] [DOI].

11.      Y.F. Gao^*, "An implicit finite element method for simulating inhomogeneous deformation and shear bands of amorphous alloys based on the free-volume model." Modelling and Simulation in Materials Science and Engineering, 14, 1329-1345, 2006 [PDF] [DOI].

10.      Y.F. Gao^*, B.N. Lucas, J.C. Hay, W.C. Oliver, G.M. Pharr, "Nanoscale incipient asperity sliding and interface micro-slip assessed by the measurement of tangential contact stiffness." Scripta Materialia, 55, 653-656, 2006 [PDF][DOI].

9.      Y.F. Gao, A.F. Bower^*, "Elastic-plastic contact of a rough surface with Weierstrass profile." Proceeding of Royal Society London, Series A, 462, 319-348, 2006 [PDF] [DOI].

8.      Y.F. Gao^*, A.F. Bower, K.-S. Kim, L.C. Lev, Y.T. Cheng, "The behavior of an elastic-perfectly plastic sinusoidal surface under contact loading." Wear, 261, 145-154, 2006 [DOI].

2005

2004

7.      Y.F. Gao^*, A.F. Bower, "A simple technique for avoiding convergence problems in finite element simulations of crack nucleation and growth on cohesive interfaces." Modelling and Simulation in Materials Science and Engineering 12, 453-463, 2004 [PDF] [DOI].

·         Codes developed in this paper are available for download [Help File] [Fortran Source File] [Abaqus Input File].

6.      Z. Suo^*, Y.F. Gao, G. Scoles, "Nanoscale domain stability in organic monolayers on metals." Trans. of ASME, Journal of Applied Mechanics, 71, 24-31, 2004 [PDF] [DOI].

2003

5.      Y.F. Gao^*, "Passing stiffness anisotropy in multilayers and its effects on nanoscale surface self-organization." International Journal of Solids and Structures 40, 6429-6444, 2003 [PDF] [Erratum] [DOI].

4.      Y.F. Gao, Z. Suo^*, "Guided self-assembly of molecular dipoles on a substrate surface." Journal of Applied Physics 93, 4276-4282, 2003 [PDF] [DOI].

·         This article also appeared in Virtual Journal of Nanoscale Science & Technology 7, issue 14, 2003.

3.      Y.F. Gao^*, Z. Suo, "The orientation of the self-assembled monolayer stripes on a crystalline solid." Journal of the Mechanics and Physics of Solids 51, 147-167, 2003 [PDF] [DOI].

2002

2.      Y.F. Gao, W. Lu, Z. Suo^*, "A mesophase transition in a binary monolayer on a solid surface." Acta Materialia 50, 2297-2308, 2002 [PDF] [DOI].

1.      Y.F. Gao, Z. Suo^*, "Domain dynamics in a ferroelastic epilayer on a paraelastic substrate." Trans. of ASME, Journal of Applied Mechanics 69, 419-424, 2002 [PDF] [DOI].

_____________________________

Book Chapters

1.      Y.F. Gao, A.F. Bower, "Rough surface plasticity and adhesion across length scales." In: Nanomechanics of Materials and Structures, edited by T.-J. Chuang, P.M. Anderson, M.-K. Wu and S. Hsieh, pp. 277-287, Springer, the Netherlands, 2006 [PDF].

Conference Publications

1.      Y.F. Gao^*,, "On the manipulation of nanoscale self-assembly by elastic field." Mat. Res. Soc. Symp. Proc. Vol. 794, T9.3, 2004 [PDF].

2.      Y.F. Gao^*,, A.F. Bower, K.-S. Kim, "Some issues of rough surface contact plasticity at micro- and nano-scale." Mat. Res. Soc. Symp. Proc. Vol. 841, R.7.3, 2005 [PDF].

3.      Y.F. Gao^*, "A micromechanical dislocation model of rough surface contact plasticity." Proceeding of World Tribology Conference, Washington DC, 2005 [PDF].

4.      F.X. Liu^*, C.L. Chiang, J.P. Chu, Y.F. Gao, P.K. Liaw, "Effects of glass-forming metallic film on the fatigue behavior of C-2000 Ni-based alloy." Mat. Res. Soc. Symp. Proc. Vol. 903E, 0903-Z14-13.1, 2006 [PDF].

Other Publications

1.      P.K. Liaw, W.H. Jiang, G.J. Fan, H. Choo, and Y.F. Gao, (eds.), special issue of Symposium on Bulk Metallic Glasses IV (TMS Annual Spring Meeting, Orlando, FL, 2/26~3/1/2007), Metallurgical and Materials Transactions A, Vol. 39, No. 8, p. 1761, August 2008 [DOI].