The Variation in the Subgrain Size in Aluminum Deformed to Large Steady-State Creep Strains.
Abstract
Pure metals(and many alloys) deformed at high (creep) temperatures strain-harden. This hardening is associated with an increase in the density of randomly arranged (forest) dislocations and subsequent formation of a three-dimensional network of low-angle dislocation boundaries (subgrains). Eventually a material reaches a steady-state condition, and hardening and recovery processes are balanced. A controversy exists as to which of these features is primarily responsible for creep resistance or strength. During steady-state deformation, the feature responsible for creep strength is expected to be invariant with strain. Some stainless steel work suggested that the subgrain size changes during steady-state. Therefore, it was believed that subgrain strengthening is not dominant in this material. Aluminum specimens were deformed to transmission electron microscopy to determine the average subgrain size.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1985
- Accession Number
- ADA161239
Entities
People
- Paul P. Mieszczanski
Organizations
- Naval Postgraduate School