Enhancement of ductility in B2-type Zr-Co-Ni alloys with deformation-induced martensite and microcrack formation

M. Matsuda, Y. Iwamoto, Y. Morizono, S. Tsurekawa, K. Takashima, M. Nishida

研究成果: Contribution to journalArticle査読

16 被引用数 (Scopus)

抄録

We investigated the microstructural evolution during tensile deformation of ZrCo and ternary Zr-Co-Ni alloys with the aim of clarifying the mechanism of enhancement of ductility in these alloys. Some long and slender microcracks were present perpendicular to the tensile direction on the surface of specimen with a nominal strain of 13%. There was an increase in not only the occurrence of microcracks but also the width of the microcracks with increasing nominal strain. The preferred sites for microcrack nucleation occurred at the grain boundaries and along the interface between the B2 parent phase and the Zr 2Co precipitates. Parts of the martensitic interface caused by tensile deformation acted as the preferred formation sites for the microcracks. Consequently, we consider that the remarkable enhancement of the ductility of the B2-type Zr-Co-Ni alloy is originated from the relaxation of stress concentration due to the microcrack formation, in addition to the transformation-induced plasticity associated with the deformation-induced martensite.

本文言語英語
ページ(範囲)45-50
ページ数6
ジャーナルIntermetallics
36
DOI
出版ステータス出版済み - 2013

All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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