Superplastic Deformation of ZnS Near Its Transformation Temperature (1020 C)

Abstract

Polycrystalline Zinc Sulfide was deformed in compression to large strains (up to 100%), near its alpha beta transformation temperature (1020 C), at strain rates that ranged from .00001 /s to 3 x .001/s. The flow stress showed a minimum near 1020 C. The strain rate sensitivity and the grain size dependence of the flow stress suggest a superplastic mechanism of deformation. There was some evidence of dynamic recrystallization and stress induced Beta (fcc) to alpha (hcp) phase transformation. The polycrystals had a tendency to form intergranular cavities at the higher temperatures and at a faster strain rates.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1989
Accession Number
ADA204830

Entities

People

  • Liang A. Xue
  • Rishi Raj

Organizations

  • Cornell University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Chemistry
  • Compression
  • Crystal Structure
  • Grain Growth
  • Grain Size
  • High Temperature
  • Hot Pressing
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanical Working
  • New York
  • Phase Transformations
  • Strain Rate
  • Stress Strain Relations
  • Transition Temperature
  • Transitions

Readers

  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.