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Title: Grain boundary segregation of Ni in W

The compatibility between Ni and W is an important consideration in a number of structural applications involving tungsten alloys. Here, results of an experimental study using Auger electron spectroscopy are presented which provide direct evidence of grain boundary segregation of Ni in W. It is also demonstrated that the segregation of nickel results in a severe embrittlement of tungsten filaments. Also, the activation energy for grain boundary diffusion of Ni in W has been calculated to be 358 kJ/mol, almost identical to the activation energy for recrystallization of dilute W-Ni alloys. This suggests that grain boundary diffusion of Ni may govern the recrystallization processes in dilute W-Ni alloys. 11 references.
Authors:
Publication Date:
OSTI Identifier:
6015312
Resource Type:
Journal Article
Resource Relation:
Journal Name: Scr. Metall.; (United States); Journal Volume: 18
Research Org:
Lockheed Research Labs., Palo Alto, CA
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TUNGSTEN BASE ALLOYS; GRAIN BOUNDARIES; RECRYSTALLIZATION; DIFFUSION; FILAMENTS; MICROSTRUCTURE; NICKEL ALLOYS; ALLOYS; CRYSTAL STRUCTURE; TUNGSTEN ALLOYS 360102* -- Metals & Alloys-- Structure & Phase Studies