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{111} Zig-Zag Transgranular Cracking in the Ll2 Intermetallic Compound Ni3Ge

Published online by Cambridge University Press:  01 January 1992

Jianxin Fang and
Erland M. Schulson
Jianxin Fang
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755 ABSTRACT
Erland M. Schulson
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755 ABSTRACT
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Abstract

Slip and fracture behavior in Ni3Ge with and without 0.06 at.% Boron has been examined by in-situstraining in a TEM. Crack propagate in a zig-zag, transgranular manner and the crack planes are coincident with the slip planes. Slip is activated on two major systems and a transition occurs ahead of dislocation pile-ups which occur on the primary system. Due to the thinning of material from the motion of dislocations, the crack follows alternately on these two slip planes, giving rise to the zig-zag transgranular path. Calculations show that the stress field due to the pile-up drives the slip transition.

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References

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