EFFECTS OF THERMOMECHANICAL PROCESSING ON DAMPING CHARACTERISTICS OF MARTENSITIC CU - 13.5 W/O AL ALLOY FOR SHIP SILENCING APPLICATION

Cu-Al alloys demonstrate high damping capacity in the martensitic state. The specific damping capacity in the gamma' martensite of a Cu-13.5 w/o Al alloy was found to vary with grain size. Since platelet length increased with grain size while platelet width remained relatively invariant, it can be inferred that martensitic platelet motion was an active mechanism for damping. Several thermomechanical processes were explored to establish positive grain size control. It was found that grain nucleation and recrystallization and grain growth were very sensitive to the usual parameters of prior strain, strain rate, annealing temperature and annealing time. Severe brittleness, reversible shape memory effects, and pseudo-elasticity were encountered during the process experimentation. (Author)

  • Corporate Authors:

    Naval Postgraduate School

    1 University Circle
    Monterey, CA  United States  93943
  • Authors:
    • Kelly, E W
  • Publication Date: 1977-12

Media Info

  • Pagination: 58 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00181269
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: MS Thesis
  • Files: TRIS
  • Created Date: Sep 14 1978 12:00AM