Direct Studies of Fracture Mechanisms in Metals at Highest Magnifications.
Abstract
Thin silver single crystals and polycrystalline foils of type 304 stainless steel in both the solution treated and sensitized condition were strained to fracture inside a high voltage electron microscope. The specimens ranged in thickness from 0.5 to 2 microns. The design of a micro straining tensile device and techniques of specimen preparation are discussed. Results indicate that bulk fracture mechanisms are operative in these materials. Necking, shearing, formation and coalescence of holes, thinning ahead of propagating crack, and the dislocation structure in plastic zone preceding the crack are presented and discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1970
- Accession Number
- AD0716573
Entities
People
- Heinz G. F. Wilsdorf
- Robert L. Lyles Jr.
- Robert W. Bauer
Organizations
- University of Virginia