Damping and Microstructures in Aged Cu-Mn Based Alloys

Abstract

An aged high damping alloy 53Cu 45Mn-2Al was studied both microstructurally by transmission electron microscopy (TEM) and microstructurally with two different damping measurement methods. In-situ heating and cooling observations were made with TEM in order to define the recently discovered flickering phenomenon associated with it's tweed microstructure. TEM studies were also made of an aged 53.6Cu-46.4Mn binary alloy. Damping measurements were obtained by a normalized bandwidth method applied to data from a resonant bar. This was used to determine (i) the aging condition for optimum damping, (ii) the subsequent trend of damping at room temperature for each aging condition, and (iii) the effect of an 8 HR storage at 100C on damping capacity. Damping measurements utilizing a free decay technique to determine log decrement were also used and compared to results from the normalized bandwidth method. Theses.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1988
Accession Number
ADA200063

Entities

People

  • Joseph P. Heil

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Alloys
  • Binary Alloys
  • Cantilever Beams
  • Chemistry
  • Electron Microscopy
  • Engineering
  • Materials
  • Materials Science
  • Measurement
  • Mechanical Engineering
  • Microscopy
  • Microstructure
  • Schools
  • Solid Solutions
  • Transmission Electron Microscopy
  • United States
  • United States Naval Academy

Readers

  • Fluid Dynamics.
  • Materials Science (Mechanical Engineering).
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics