Abstract
(Co, Ni)Zr intermetallic compounds, which have Bf structure at room temperature and B2 structure at elevated temperatures, were heated and cooled repeatedly in the temperature range between room temperature and 1223 K. This process produced the large permanent deformation in Co30Ni20Zr50. Permanent elongation by as much as 0.2 to 0.3% per cycle was observed for the specimen parallel to the columnar structure, which grew from the bottom to the top of the button ingot, and permanent shrinkage by as much as 0.2% per cycle was observed for the specimen perpendicular to the columnar structure. For example, permanent elongation of about 30% was obtained after 93 cycles of the heating and cooling process in the former specimen, but no permanent elongation nor shrinkage was observed in the specimen parallel and perpendicular to the columnar structure for Co36Ni14Zr50. The latter alloy had a different preferred orientation of the columnar structure from the former. These facts show that the crystal orientation influenced the permanent deformation caused by this transformation.
Published Version
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