CRYSTAL STRUCTURE CHANGES IN THE SURFACE LAYERS OF NICKEL SAMPLES INFLUENCED BY PERIODIC HEAT-TREATMENT (KRISTALLOSTRUKTURNYE IZMENENIYA V POVERKHNOSTNYKH SLOYAKH NIKELEVYKH OBRAZTSOV, PROISKHODYASHCHIE POD VLIYANIEM PERIODICHESKIKH TEPLOVYKH NAGRUZHENII),

Abstract

Specimens of electrolytically pure nickel were annealed for 30 min at 500C to remove the surface work hardness resulting from their preparation, some of the specimens were polished mechanically, and all were subjected to thermal treatment which consisted in heating to 900C, holding for 5 min, and cooling in water (25C). The specimens were then analyzed by x-ray diffraction and electron microscopy. The results indicate that the mechanisms of failure of thin and massive nickel specimens are substantially different: In the case of failure of thin specimens, a predominant role is played by a vacancy mechanism, whereas in massive specimens at considerable heating and cooling rates the thermal stresses produced are large enough to activate the dislocatory process of failure.

Document Details

Document Type
Technical Report
Publication Date
Nov 16, 1967
Accession Number
AD0676170

Entities

People

  • L. V. Tikhonov
  • R. G. Gontareva

Organizations

  • National Air and Space Intelligence Center

Tags

DTIC Thesaurus Topics

  • Crystal Structure
  • Crystals
  • Diffraction
  • Electron Microscopy
  • Electrons
  • Hardness
  • Heat Treatment
  • Heating
  • Microscopy
  • Stresses
  • Thermal Stresses
  • X Rays
  • X-Ray Diffraction

Readers

  • Information Retrieval
  • Materials Science (Mechanical Engineering).
  • Thin Film Deposition Science.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene