Effects of Thermomechanical Processing on Damping Characteristics of Martensitic Cu - 13.5 w/o Al Alloy for Ship Silencing Application.

Abstract

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)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1977
Accession Number
ADA053878

Entities

People

  • Edward William Kelly

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Engineered Resilient Systems
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Alloys
  • Brittleness
  • Castings
  • Chemistry
  • Cold Working
  • Crystal Structure
  • Grain Growth
  • Grain Size
  • Hot Working
  • Materials
  • Mechanical Engineering
  • Mechanical Properties
  • Mechanics
  • Metallurgy
  • Phase Transformations
  • Strain Rate
  • Transition Temperature

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  • Powder metallurgy of Titanium alloys.

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  • AI & ML
  • AI & ML - Bayesian Inference