Effects of thermomechanical processing on damping characteristics of martensitic Cu 13.5 w/o Al alloy for ship silencing application

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Authors
Kelly, Edward William
Subjects
Martensitic transformation
Damping capacity
Ship silencing
Advisors
Perkins, A. Jeff
Date of Issue
1977-12
Date
December 1977
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Cu-Al alloys demonstrate a high damping capacity in the martensitic state. The specific damping capacity in the y' martensite of a Cu-13.5w/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 pseudoelasticity were encountered during the process experimentation.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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