Damping and microstructures in aged Cu-Mn based alloys
By: Joseph Patrick Heil
Contributors: Naval Postgraduate School (U.S.)
Publisher: Naval Postgraduate School
Published: 1988
Place of publication: Monterey, California
Language: eng
Number of pages: 58
Subjects: Mechanical engineering
Description: 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. (JES)
Notes: Thesis advisor(s): Perkins, A.J.

"June 1988."

Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, June 1988.

Includes bibliographical references (p. 55-57)

"Approved for public release, distribution unlimited-Cover."

US Navy (USN) author.