The effect of deformation on abnormal grain growth in tungsten ingots

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90222-4· OSTI ID:6987371

Briant, C L; Zaverl, F; Carter, W T ^[1]

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1. General Electric Co., Schenectady, NY (United States). Research and Development Center

This paper reports a study of abnormal grain growth in tungsten ingots that had been deformed in compression at elevated temperatures. The results show that very large grains form in these samples directly from the polygonized structure when the deformed samples are annealed. A critical amount of deformation is required to begin this process. Beyond that point, the resulting grain size decreases with increasing amounts of deformation and decreasing test temperature. Abnormal grain growth occurs first in the regions of the sample that have undergone the most strain. Two factors appear to provide the driving force for the formation of these large grains. One is the elimination of grain boundary area. This effect would be present in any system undergoing regular or abnormal grain growth. The other is the elimination of grains that are more highly strained by grains that are less strained. In this way, this process is similar to the large grain growth resulting from strain annealing.

• OSTI ID: 6987371
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:8; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
DEFORMATION
ELEMENTS
GRAIN BOUNDARIES
GRAIN GROWTH
GRAIN REFINEMENT
METALS
MICROSTRUCTURE
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
TUNGSTEN