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Boron and Hydrogen in NI3AL: Part II. Mechanical Testing of Bicrystals

  • Patricia E. Johnson (a1), W. Gourdin (a1), A. Gonis (a1), N. Kioussis (a2) and M. Vaudin (a3)...

Abstract

To provide a sensitive measurement of the effect of boron segregation on the strength and ductility of Ni3A1 grain boundaries, bicrystal tensile tests were performed on small specimens of boron doped Ni76A124 cut from extremely large-grained boules. Five specimens with the same “random” or low-symmetry grain boundary (disorientations measured by means of backscattered Kikuchi patterns) and two specimens with a second random grain boundary were tested in quenched and slow-cooled conditions. Duplicate tests performed in a low (7 ppm) water-vapor environment showed that the fracture mode and the stress and strain at fracture are altered by environmental embrittlement at individual, partially strengthened grain boundaries.

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