Relationships of slip morphology, microcracking, and fracture resistance in a lamellar TiAl-alloy View Full Text


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Article Info

DATE

1994-06

AUTHORS

K. S. Chan, Y-W. Kim

ABSTRACT

The fracture resistance of a lamellar TiAl-alloy was investigated by J-testing under various displacement rates at ambient temperature. Possible relationships between slip morphology, microcracking, and fracture toughness were studiedvia optical electron microscopy and scanning electron microscopy (SEM). The results indicated that the lamellar TiAl-alloy exhibited a resistance-curve fracture behavior that was relatively rate insensitive in air at ambient temperature. Both interlamellar and translamellar deformation lines were observed in the crack-tip region and in the crack-wake ligaments. Theoretical analyses suggested that the interlamellar deformation lines were likely due to {111}〈110] easy slip, and the translamellar deformation lines were probably produced by both {lll}〈110] easy slip and\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$\{ 111\} \langle 11\bar 2]$$ \end{document} ordered microtwins. Redistribution of crack-tip normal stresses led to a diffuse process zone of aligned microcracks formed by decohesion of slipbands. Relaxation of plastic constraint and interface decohesion resulted in higher plastic deformation, crack deflection, and redundant fracture in the crackwake ligaments that gave rise to the relatively high fracture resistance observed in the lamellar TiAl-alloy. More... »

PAGES

1217-1228

References to SciGraph publications

  • 1989-07. Intermetallic alloys based on gamma titanium aluminide in JOM
  • 1974-06. The plastic deformation of TiAl in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1975-11. The deformation and fracture of TiAl at elevated temperatures in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1993-07-01. Failure diagrams for unidirectional fiber metal-matrix composites in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1992-06. Influence of microstructure on crack-tip micromechanics and fracture behaviors of a two-phase TiAl alloy in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1991-08. Progress in the understanding of gamma titanium aluminides in JOM
  • 1993-03. Toughening mechanisms in titanium aluminides in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1993-01. Rate and environmental effects on fracture of a two-phase TiAl-alloy in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1992-05. Understanding fracture toughness in gamma TiAl in JOM
  • 1991-09. Micromechanics of shear ligament toughening in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf02652296

    DOI

    http://dx.doi.org/10.1007/bf02652296

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1028156298


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