LOW TEMPERATURE EMBRITTLEMENT MECHANICS DEDUCED FROM ZINC SINGLE CRYSTAL FRACTURE STUDIES

The most important conclusion of this work is that low temperature brittleness in zinc single crystals is not due to the cessation of slip below a certain temperature. On the contrary slip is quite active, and it is its activity that induces low temperature brittleness: slip causes rotation of the lattice which in turn sets up orientation gradients adjacent to constricted and unslipped regions. At high temperatures these orientation gradients are accommodated by kink-planes, at low temperatures, by cleavage. These observations are important, for they bear directly on the problem of low temperature brittleness of polycrystalline zinc (because of the orientation gradients always found in polycrystalline metals when deformed) and on the reasons for the lack of low temperature brittleness in face-centered cubic metals (which kink differently from hexagonal close packed crystals).

  • Corporate Authors:

    Case Western Reserve University

    Department of Civil Engineering
    10900 Euclid Avenue
    Cleveland, OH  USA  44106

    Ship Structure Committee

    National Academy of Science, 2101 Constitution Avenue, NW
    Washington, DC  USA  20418
  • Authors:
    • Morton, P H
    • Baldwin Jr, W M
  • Publication Date: 1953-5-1

Media Info

  • Features: References;
  • Pagination: 51 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00331002
  • Record Type: Publication
  • Source Agency: Ship Structure Committee
  • Report/Paper Numbers: SSC- 58 Prog Rpt.
  • Contract Numbers: NObs-50303
  • Files: TRIS
  • Created Date: May 21 1981 12:00AM