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Fracture Strength of Grain Boundaries in Ni3Al

Published online by Cambridge University Press:  21 March 2011

Jian-Qing Su ,
M. Demura  and
T. Hirano
Jian-Qing Su
Affiliation:
National Research Institute for Metals, 1–2–1 Sengen, Tsukuba, Ibaraki 305–0047, Japan
M. Demura
Affiliation:
National Research Institute for Metals, 1–2–1 Sengen, Tsukuba, Ibaraki 305–0047, Japan
T. Hirano
Affiliation:
National Research Institute for Metals, 1–2–1 Sengen, Tsukuba, Ibaraki 305–0047, Japan
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Abstract

The fracture strength of grain boundaries in Ni3Al was quantitatively measured by performing tensile tests on miniature bicrystal specimens with various grain boundary types. A fairly good relationship between fracture mode, fracture strength and Σ value was established. The Σ1, Σ3 and Σ9 boundaries were found to be strongly crack-resistant but the adjacent bulk fractured. In contrast, Σ5, Σ7, Σ11, Σ13 and random boundaries were found to be less crack-resistant and fractured at lower stresses than the fracture strength of the bulk. In the latter case, the fracture strength of the Σ11 and Σ13 boundaries was higher than that of the Σ5 and Σ7 boundaries. Most random boundaries were as weak as the Σ5 and Σ7 boundaries, but some exhibited high fracture strength comparable to that of the Σ11 and Σ13 boundaries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N6.10.1
Copyright
Copyright © Materials Research Society 2001

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References

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