In-Situ Observation of Formation of Staking Faults in Ni3Ga by Stretching Thin Foils in an Electron Microscope

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Abstract
Formation of stacking fault ribbons in Ni3Ga single crystals during tensile tests in an electron microscope has been observed. Two ways of stacking fault formation were observed. One is the formation from moving superlattice dislocations by a decomposition process, which can also be observed in bulk crystals. The other is a process which may occur only in thin foils, in which antiphase boundary ribbons are created at first and then changed into stacking faults. Sometimes stacking faults in the latter case were segmented into many small pieces on the slip plane. Stacking faults were bounded by partial dislocations which are parallel to the directions.

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