University of Illinois Urbana-Champaign

Enhanced grain boundary sliding during reversed creep of lead

Kitagawa, Masaki

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https://hdl.handle.net/2142/112045

Description

Title
Enhanced grain boundary sliding during reversed creep of lead
Author(s)
Kitagawa, Masaki
Issue Date
1968-10
Keyword(s)
  • Grain Boundary Sliding
  • Creep
  • Lead
Abstract
Chemical lead is subjected to multiple creep stress reversals at room temperature, 100 C and 150 C, and the alterations in grain structure are examined. Creep deformation resistance at these test temperatures decreases significantly under multiple stress reversals. However, the decrease in creep resistance caused by reversed stressing is smaller when the test temperature is increased above about half of the melting point of the metal. Significant microstructural changes are observed during reversed creep. Grain boundaries are found to migrate toward planes of maximum shear stress, resulting in an orthorhombic grain structure. The formation of this unusual grain structure is discussed in relation to creep resistance changes due to reversed stressing. To support the discussion, grain boundary sliding during reversed creep was measured. The contribution of grain boundary sliding to the total creep strain is found to greatly increase as the orthorhombic grain structure is formed.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 319
  • 1968-0375
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112045
Sponsor(s)/Grant Number(s)
National Aeronautics and Space Administration, Lewis Research Center, Research Grant NGR 14-005-025
Copyright and License Information
Copyright 1968 Board of Trustees of the University of Illinois

Owning Collections

Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.