Interaction between deformation process and lamellar interfaces in polysynthetically twinned (PST) crystals of TiAl

Dongliang Lin, Mingwei Chen

    Research output: Contribution to conferencePaperpeer-review

    2 Citations (Scopus)

    Abstract

    Interaction of deformation process with lamellar interfaces was investigated by TEM observation. The α2/γ interfaces severely inhibit the deformation twin propagation. Even the 〈1120〉{0001} slip mode can be activated in α2 lamellae, since no enough slip systems especially in [0001] direction are available, high local stress concentration is induced in the interfaces and α2 lamellae. The switch effect of deformation twinning to dislocation gliding at the interfaces between γ - phase variants related by pseudo twin and 120° rotational type are observed, which results from the interfaces inhibiting twin propagation and relaxing the stress concentration by emitting dislocations. Comparatively, the true twin interfaces have less resistance on deformation process, even twin dislocations and gliding dislocations pile up at the interfaces as deformation twins and gliding dislocations pass through them. Generally speaking, four kinds of interfaces have a resistance to deformation process in varying degrees and induce local stress concentration, which may play an important role on microcrack nucleation at the lamellar interfaces.

    Original languageEnglish
    Pages323-330
    Number of pages8
    Publication statusPublished - 1995 Dec 1
    EventProceedings of the 1995 124th TMS Annual Meeting - Las Vegas, NV, USA
    Duration: 1995 Feb 131995 Feb 16

    Other

    OtherProceedings of the 1995 124th TMS Annual Meeting
    CityLas Vegas, NV, USA
    Period95/2/1395/2/16

    ASJC Scopus subject areas

    • Geology
    • Metals and Alloys

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