Y. M. Xing

Inner Mongolia University of Technology, Suiyüan, Inner Mongolia, China

Are you Y. M. Xing?

Claim your profile

Publications (22)18.11 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The electron-beam moiré method uses a high frequency grating to measure microscopic deformation. Increasingly fine gratings are being developed to achieve increasingly high resolutions in microscopic stress analysis. In this study, we improve the electron grid fabricating technique by using a common scanning electron microscope (SEM). An error analysis for the multi-scanning grating was performed by a sampling moiré method. The grating manufacturing parameters strongly affect the superfine grating quality. A high accelerating voltage or a short working distance yield better results generally. A set of optimal parameters is suggested based on a minimum-error criterion. A cross-line grid with a frequency of 10,000 lines/mm and a parallel grating with a frequency of 13,000 lines/mm were successfully fabricated.
    Experimental Mechanics 01/2014; · 1.55 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A combination of in-situ scanning electron microscopy (SEM) and geometric phase analysis (GPA) was used to study the deformation fields around a crack-tip in single-crystal silicon under uniaxial tensile load. The sub-microscale silicon pillars grating was fabricated using holographic lithography followed by inductively coupled plasma etching. A series of SEM images of dynamic crack with the sub-microscale grating were obtained during tensile testing. The strain fields around the crack-tip were mapped by GPA. The strain fields were compared with the linear elastic fracture mechanics solutions. It was determined that the deformation is performed around the crack-tip area. The normal strain εxx and shear strain εxy are nearly zero, and the strain fields are dominated by the normal strain εyy component. With the increase of displacement load, the crack propagated mainly along the [010] crystal direction and the strains around the crack-tip increased gradually. It is noted that the theoretical prediction is lower than the experimental results from 0 to 2 μm ahead of the crack-tip. However, the agreement between experimental results and theoretical prediction is very good far from the crack-tip (>2 μm).
    Optics and Lasers in Engineering 12/2012; 50(12):1694-1698. · 1.92 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The strain field of GP zone plays a very important role in strengthening of the precipitation-hardened aluminum alloys by prohibiting movement of dislocations; however, quantitative analysis about the strain field of the GP zone in the aluminum alloys has been seldom reported elsewhere. In this paper, the microstructure of GP zone in an Al–Zn–Mg–Cu alloy was explored by using high-resolution transmission electron microscopy (HRTEM), and the displacement field of lattice planes within the GP zone was experimentally measured by geometric phase analysis (GPA) technique; then, the quantitative results about strains of the distorted lattice planes within the GP zone were also obtained. It is found that the GP zone core is convergence region of the strains, and the maximum value of the compressive strains within the GP zone is about 7.6%.
    Physica B Condensed Matter 11/2012; 407(22):4466–4469. · 1.28 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Misfit dislocations in a Ge/Si heterostructure were investigated experimentally in the present work. The misfit dislocations were demonstrated to be pure edge dislocations, with distances of about 10 nm between misfit dislocations. The strain fields around the misfit dislocation core were mapped using a combination of geometric phase analysis and high-resolution transmission electron microscopy. The strain measurement results were compared with the Peierls–Nabarro and Foreman models of dislocation networks. Based on the comparison results, the Foreman model can better describe the strain fields of the misfit dislocations in the Ge/Si heterostructure.
    Optics and Lasers in Engineering 05/2012; 50(5):796–799. · 1.92 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: A micro-crack in silicon was experimentally investigated by using a combination of transmission electron microscopy and geometric phase analysis. The strain fields of the crack tip, with scales of a few tens of nanometers, were mapped. The crack tip dislocation emission and stress relief by dislocation generation around a crack tip can be proved. And, the strain field of an edge dislocation was compared with the Peierls–Nabarro dislocation model at the scale of a dislocation width. We show that the Peierls–Nabarro model is the appropriate theoretical model to describe the deformation fields of the dislocation core.
    Applied Physics A 01/2011; 105(1):207-210. · 1.69 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The full strain field near the interface of steel fiber/concrete in a half-mold specimen was measured using a combined method of pullout test and digital image correlation. The strain localization mechanism of the interfacial failure is discussed. The strain distributions near the interface at a straight fiber under different loads show that the interfacial shear failure has a distinct characteristic of intervals in time and space directly related to the strain localization, which makes the interfacial failure initiate, develop and transfer successively. In particular, the local strain distributions around pores near the straight fiber interface demonstrate that the strain changes its sign at the irregular parts of the pore where the initial debonding took place and the deformation path is affected by the pore.
    Mechanics of Composite Materials 01/2011; 47(3):301-312. · 0.44 Impact Factor
  • C.W. Zhao, Y.M. Xing
    [Show abstract] [Hide abstract]
    ABSTRACT: A micro-crack in a single-crystal silicon was investigated using a high-resolution transmission electron microscopy. In particular, geometric phase analysis and numerical moiré method were employed to analyze the deformation fields of this crack-tip. The strain field maps of the crack-tip indeed show that the deformation can only occur at the crack-tip area. The maxima of the strain components, namely, εxx, εyy, and εxy at the crack-tip area can reach 1.47%, 2.91%, and 2.47%, respectively. Linear strain–distance curves were obtained at a 10 nm scale from the crack-tip.
    Optics and Lasers in Engineering 11/2010; 48(11):1104–1107. · 1.92 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Specially designed fibers are widely used in engineering practice because the specially-designed shape can help to improve the bonding strength of the fiber and the interface. Studied in this paper is the interfacial shear stress transfer behavior on both sides of the specially designed fiber when it is being pulled out; in which automatic analysis of three-dimensional photoelasticity is employed and the finite element method is adopted. The results show that the stress transfer occurs mainly in the region near the fiber’s embedded end where the stress reaches its critical point, leading to debonding of the interface. Before debonding, as the pullout loading increases, the peak value of shear stress transfers along the fiber from the embedded end to the interior of the matrix, and then stops at the hooked part of the fiber because of its impediment. When the interface begins to debond as the load increases, the shear stress can be transferred to the hooked part. KeywordsFiber-reinforced composites-Specially-shaped fiber-Interfacial stress transfer-Photo-elasticity-FEM
    Acta Mechanica Sinica 01/2010; 26(1):113-119. · 0.69 Impact Factor
  • C.W. Zhao, Y.M. Xing, J.Z. Yu, G.Q. Han
    [Show abstract] [Hide abstract]
    ABSTRACT: We report the quantitative strain characterization in semiconductor heterostructures of silicon–germaniums (Si0.76Ge0.24) grown on Si substrate by an ultra-high vacuum chemical vapor deposition system. The relaxed SiGe virtual substrate has been achieved by thermal annealing of the SiGe film with an inserted Ge layer. Strain analysis was performed using a combination of high-resolution transmission electron microscopy and geometric phase analysis.
    Physica B Condensed Matter 01/2010; 405(16):3433-3435. · 1.28 Impact Factor
  • J. Zhu, Y. M. Xing, F. C. Lang, A. F. Jiang
    [Show abstract] [Hide abstract]
    ABSTRACT: Because of a significant mismatch between the thermal expansion coefficients of the fiber and the matrix, the interfacial thermal residual stress (TRS) in SiC/Ti-15-3 composites is induced during cooling procedure when continuous SiC fiber reinforced titanium-based composites are manufactured. The distance between fibers varies randomly. The TRS in the region nearby one fiber will be affected by the neighbor fibers. This paper aims to study the fibers interactional influence of neighbor fibers interfacial thermal residual stress. After pushing out neighbor fibers, TRS is measured using micro-moiré interferometry. This process has also been numerically simulated using the finite element software.
    Proc SPIE 11/2008;
  • C. W. Zhao, Y. M. Xing
    [Show abstract] [Hide abstract]
    ABSTRACT: The strain field of an edge dislocation in silicon was experimentally investigated. High-resolution transmission electron microscopy and geometric phase analysis were used to map the strain fields of the edge dislocation. The strain measurement results were compared with the Peierls-Nabarro dislocation model. The comparison shows that the Peierls-Nabarro model is an appropriate theoretical model to describe the strain fields of edge dislocation in silicon.
    Proc SPIE 11/2008;
  • Source
    Q. Gu, C. W. Zhao, H. Q. Jing, Y. M. Xing
    [Show abstract] [Hide abstract]
    ABSTRACT: A nanoscale experimental study of micro-crack in silicon was presented by using a combination of high-resolution transmission electron microscopy and geometric phase analysis. The results show that there is an amorphous phase content in the crack body. The width of the amorphous narrow band which exists within the crack body is 2nm approximately. The geometric phase analysis technology was applied to calculate the strain fields of the crack tip. The trend of the experiment strain value ahead of the crack tip is the same with the trend of the isotropic elastic theory strain value.
    Proc SPIE 11/2008;
  • Source
    R. B. Zhao, Y. M. Xing, P. C. Bai
    [Show abstract] [Hide abstract]
    ABSTRACT: Ultrasonic shot peening treatment is used to treat structural surfaces, which can enhance the overall strength, stiffness and fatigue life of the treated material. This process induces a layer of nanocrystal grains in the surface of austenitic stainless steel. The microstructure and the composition of the surface layer are examined using X-ray diffraction and transmission electron microscopy. Experimental results show that the grains are mainly composed of oxide nanocrystal particles, NiFe2O4, and a few martensite particles. Phase transformations happen during the course of the ultrasonic shot peening. The chemical composition of the nano-layer is (8.03 Cr, 4.32 Ni, 3.86 Cu, 83.79 Fe) (mass %).
    Proc SPIE 11/2008;
  • [Show abstract] [Hide abstract]
    ABSTRACT: The specially designed fiber is widely used in engineering because it can help to improve the bonding strength of the fiber and the interface. This study investigates the mechanical behavior near interface in fiber concrete when fiber is being pulled out using the photoelasticity. The results show that the shape of the specially designed fiber can increase its capacity against pullout but at the same time stress concentrations will take place at the specially shaped part, so it is important to design the shape optimally.
    Proc SPIE 11/2008;
  • C.W. Zhao, Y.M. Xing, J.Z. Yu, G.Q. Han
    [Show abstract] [Hide abstract]
    ABSTRACT: Quantitative high-resolution transmission electron microscopy was used to examine structural peculiarities of SiGe quantum islands on an atomic scale. A combination of high-resolution transmission electron microscopy and geometric phase analysis was applied to study the deformation fields of SiGe quantum islands grown on a Si(001) substrate by an ultrahigh vacuum chemical vapor deposition system. The numerical moire method was applied to visualize the lattice fringe surrounding the interface defects.
    Nanoelectronics Conference, 2008. INEC 2008. 2nd IEEE International; 04/2008
  • C.W. Zhao, Y.M. Xing, J.Z. Yu, G.Q. Han
    [Show abstract] [Hide abstract]
    ABSTRACT: We report the quantitative characterization of strain components in semiconductor heterostructures of silicon-germaniums (Si<sub>0.76</sub>Ge<sub>0.24</sub>) grown on Si substrate with an inserted Ge layer by an ultrahigh vacuum chemical vapor deposition system. Strain analysis was performed using a combination of high-resolution transmission electron microscopy and geometric phase analysis. The numerical moire method was applied to visualize the lattice fringe surrounding the defects. The strain components epsiv<sub>xx</sub>, epsiv<sub>yy</sub>, epsiv<sub>xy</sub>of interfaces and defects were mapped, respectively. The strain was about 3% in the interface region.
    Nanoelectronics Conference, 2008. INEC 2008. 2nd IEEE International; 04/2008
  • C. W. Zhao, Y. M. Xing
    [Show abstract] [Hide abstract]
    ABSTRACT: A micro-crack in silicon was experimentally investigated using high-resolution transmission electron microscopy (HRTEM). The crystal lattice structure of a micro-crack was carefully observed at a HRTEM image scale of approximately 18 nm. The crystal lattice structure of the crack tip region was observed to be regular with good periodicity. The HRTEM images of the micro-crack demonstrate that the micro-crack cleavage expands along two crystal planes, where the principal cleavage plane is the (1 1 1) crystal plane.
    Physica B Condensed Matter 01/2008; 403:4202-4204. · 1.28 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The strain field of low-angle grain boundaries in gold was experimentally investigated. The grain boundaries consist of the arrangement of discrete dislocations. High-resolution transmission electron microscopy (HRTEM) and geometric phase analysis (GPA) were employed to map the strain field of grain boundaries. The numerical moiré method was used to visualize the dislocations. The strain components εxx, εyy, εxy and rigid rotation ωxy were mapped. The dislocation core regions are convergence regions of strain. The largest values of strain occur in the immediate dislocation core region. The strain field around an edge dislocation was compared with Peierls–Nabarro dislocation model. The comparison result has demonstrated that the Peierls–Nabarro model can describe the strain field around edge dislocation.
    Physica B Condensed Matter 01/2008; 403:1838-1842. · 1.28 Impact Factor
  • C. W. Zhao, Y. M. Xing, P. C. Bai
    [Show abstract] [Hide abstract]
    ABSTRACT: The displacement field of an edge dislocation in aluminum was experimentally investigated. Three typical theoretical models were discussed. High-resolution transmission electron microscopy (HRTEM) and geometric phase analysis (GPA) were used to map the displacement field of an edge dislocation. The displacement field near the dislocation core was determined. The experimental show that Peierls Nabarro model is the most appropriate theoretical model for displacement field of dislocation in aluminum.
    Physics Letters A 01/2008; 372:312-315. · 1.77 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We present a displacement and strain analysis of edge dislocation core in gold. The displacement and strain field around the edge dislocation were mapped by geometric phase analysis of high-resolution transmission electron microscopy images. The displacement and strain measurement results were compared with the isotropic elastic theory dislocation model, the anisotropic elastic theory dislocation model, the Peierls–Nabarro dislocation model and the Foreman dislocation model (a=4). These comparisons show that the Peierls–Nabarro model is the most appropriate theoretical model to describe the deformation fields of the dislocation core.
    Acta Materialia - ACTA MATER. 01/2008; 56(11):2570-2575.