Failure Properties of Aluminum and Aluminum Alloys under Impact Conditions.
Abstract
Research under this grant was directed to two distinct tasks. First was study of the kinetics of shock-induced phase transitions in solids; second was measurement of precursor amplitudes in aluminum under carefully controlled conditions. Shock-induced stresses were measured in single crystals of KCl with shock waves propagating in <100>, <110>, and <111> directions and in single crystals of BaF2 with propagation in <111> and <100> directions. KCl measurements give clear evidence of the initiation of transformation at the established (fcc-bcc) transformation pressure. Stress-time profiles in BaF2 with <111> orientation have a complex structure which apparently results from interaction between the shear yielding process and phase transformation. Precursor amplitudes in aluminum are uniformly low for 1060-0 commercial aluminum, 5-9's single crystals, and single crystals doped with .01 and 0.1 atomic percent copper. Variation of heat treatment to change precipitate structure affects precursor amplitude as it does static yield stress.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1976
- Accession Number
- ADA021129
Entities
People
- G. Richard Fowles
- George E. Duvall
Organizations
- Washington State University