A method for measuring microstructural-scale strains using a scanning electron microscope:: Applications to γ-titanium aluminides

被引:38
作者
Biery, N [1 ]
De Graef, M
Pollock, TM
机构
[1] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA
[2] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2003年 / 34A卷 / 10期
关键词
D O I
10.1007/s11661-003-0294-7
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This article introduces a new technique for measuring strains on the scale of the microstructure using a scanning electron microscope (SEM) and an in-situ tensile stage. A grid of markers is deposited on the polished surface of a tensile sample. The method then compares a reference image of the undistorted material with an image taken after deformation. A convolution operation determines the location of each of the markers in both images, from which the marker displacements and surface strains follow. Displacement accuracies of 0.01 image pixels are attainable. We have applied this method to cast gamma-TiAl-based alloys. The properties of these alloys depend sensitively on the microstructure, which can vary widely in morphology and scale. The surface-displacement mapping technique is effective for identification of microstructural features that affect the local straining and resulting properties in this class of intermetallics.
引用
收藏
页码:2301 / 2313
页数:13
相关论文
共 18 条
  • [1] Use of Weibull statistics to quantify property variability in TiAl alloys
    Biery, N
    De Graef, M
    Beuth, J
    Raban, R
    Elliott, A
    Austin, C
    Pollock, TM
    [J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2002, 33 (10): : 3127 - 3136
  • [2] BLACKBURN MJ, 1967, T METALL SOC AIME, V239, P287
  • [3] HOLOGRAPHIC MOIRE FOR STRAIN FRINGE PATTERNS
    FANG, J
    DAI, FL
    [J]. EXPERIMENTAL MECHANICS, 1991, 31 (02) : 163 - 167
  • [4] DEFORMATION OF POLYSYNTHETICALLY TWINNED CRYSTALS OF TIAL WITH A NEARLY STOICHIOMETRIC COMPOSITION
    FUJIWARA, T
    NAKAMURA, A
    HOSOMI, M
    NISHITANI, SR
    SHIRAI, Y
    YAMAGUCHI, M
    [J]. PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1990, 61 (04): : 591 - 606
  • [5] Habel U, 1999, GAMMA TITANIUM ALUMINIDES 1999, P301
  • [6] Hartman G., 1987, Experimental Techniques, V11, P24, DOI 10.1111/j.1747-1567.1987.tb00400.x
  • [7] ROOM-TEMPERATURE TENSILE DEFORMATION OF POLYSYNTHETICALLY TWINNED (PST) CRYSTALS OF TIAL
    INUI, H
    OH, MH
    NAKAMURA, A
    YAMAGUCHI, M
    [J]. ACTA METALLURGICA ET MATERIALIA, 1992, 40 (11): : 3095 - 3104
  • [8] Temperature dependence of yield stress, deformation mode and deformation structure in single crystals of TiAl (Ti-56 at% Al)
    Inui, H
    Matsumuro, M
    Wu, DH
    Yamaguchi, M
    [J]. PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1997, 75 (02): : 395 - 423
  • [9] In situ measurement of local strain in a metal matrix composite by the object grating technique
    Liu, YL
    Fischer, G
    [J]. SCRIPTA MATERIALIA, 1997, 36 (10) : 1187 - 1194
  • [10] MARTIN PL, 1997, STRUCTURAL INTERMETA, P387