A STUDY OF THE CRYSTAL STRUCTURE OF TI-AL ALLOYS AND HYDROGEN INDUCED EXPANSIONS.

Abstract

The structure of a Ti-Al phase reported on gamma Ti3Al has been found by single crystal x-ray studies to be alpha Ti with superlattice spots of Ti3Al. A surface expansion, found to occur after etching alloys containing 9.5-12.5 wt% Al, occurs as a result of hydrogen picked up by etching. It is proposed that hydrogen initially enters octahedral sites of Ti3Al coherent with alpha Ti and later shifts to the tetrahedral sites. It is postulated that expansion occurs when the hydrogen enters the tetrahedral sites. (Author)

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1966
Accession Number
AD0801472

Entities

People

  • H. Margolin
  • H. Portisch

Organizations

  • New York University

Tags

DTIC Thesaurus Topics

  • Crystal Lattices
  • Crystal Structure
  • Crystals
  • Hydrogen
  • Single Crystals
  • Superlattices
  • X Rays

Fields of Study

  • Materials science

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Powder metallurgy of Titanium alloys.
  • Thin Film Deposition Science.