Accession Number:

ADA066547

Title:

The Effect of Ion Plating and Ion Implantation on the Cyclic Response and Fatigue Crack Initiation of Metals and Alloys.

Descriptive Note:

Technical rept. no. 1, 1 Mar 78-28 Feb 79,

Corporate Author:

GEORGIA INST OF TECH ATLANTA FRACTURE AND FATIGUE RESEARCH LAB

Report Date:

1979-03-01

Pagination or Media Count:

29.0

Abstract:

X-ray diffuse scattering and transmission electron microscopy have been used to study the defect state of copper implanted with aluminum and argon ions. Electron microscopy studies of argon implanted thin foils reveals vacancy loops in the size range of 70A to 350A diameter for a dose of 2 x 10 to the 15th power ionssq. cm. at 100 kev. X-ray diffuse scattering measured around the 222 Bragg reflection reveals a combination of microalloying and dislocation loop effects from implantation of aluminum ions to a dose of 2 x 10 to the 16th power ionssq. cm. at 100 kev. Loop densities on the order of 10 to the 17th powersq. cm. and an average loop size of 25A was estimated from the x-ray data. The aluminum ion damage is largely unchanged upon annealing for 30 minutes at 500 deg and 600 deg C. Alloying appears to stablize the surface radiation damage relative to damage produced in self-ion bombardments. The possible effectiveness of implanted layers in affecting fatigue crack initiation is being assessed. Author

Subject Categories:

  • Coatings, Colorants and Finishes
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE