Ductility enhancement in B2-Type Zr-Co-Ni alloys with martensitic transformation

Mitsuhiro Matsuda, Katsutoshi Hayashi, Minoru Nishida

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The relationship between the microstructures and mechanical properties in the ternary Zr-Co-Ni alloys has been investigated. X-ray diffraction measurements at room temperature show that Zr50Co50Ni alloys undergo martensitic transformation from the B2 to B33 structures by the substitution amounts of Ni above 14% for Co. The tensile strength and elongation increase remarkably by substituting Ni up to 13%. Especially, the Zr 50oCo39Ni11 alloy has the extremely high total elongation of 23%. There are many (021 )b33 deformation twins in addition to the dislocations with the (lOO)-type Burgers vector just near the fractured area. These twins are considered to be an internal defect of the deformation induced martensite which has high hardness about 430 Hv. Therefore, it is concluded that the remarkable enhancement of the ductility of Zr-Co-Ni alloys is due to the transformation induced plasticity.

Original languageEnglish
Pages (from-to)2335-2340
Number of pages6
JournalMaterials Transactions
Volume50
Issue number9
DOIs
Publication statusPublished - Sep 1 2009

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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