Effects of thermal ε martensite content and deformation on damping capacity of a Co-32 wt.% Ni alloy

Young-Kook Lee, Tae Joong Ha, Joong Hwan Jun, Chong Sool Choi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The damping capacity of Co-32 wt.% Ni alloy was investigated as a function of the amount of thermal and strain-induced ε martensite under non-magnetic and 900 Oe magnetic fields, respectively. The damping capacity of the Co-32 wt.% Ni alloy containing ε martensite without magnetic field consists of the magneto-mechanical damping capacity of mainly α phase, damping capacities of α and ε phases without magneto-mechanical damping effect. Under a magnetic field of 900 Oe, the more the thermal ε martensite mass fraction the higher the damping capacity. However, the damping capacity of the deformed Co-32 wt.% Ni alloy with the strain-induced ε martensite decreases with increasing deformation degree despite the increase in total ε martensite fraction, because the lattice defects like dislocations introduced during deformation act as barriers to movement of damping sources such as magnetic domain walls, stacking faults boundaries in both α and ε phases, and α/ε interfaces.

Original languageEnglish
Pages (from-to)468-472
Number of pages5
JournalMaterials Science and Engineering A
Volume370
Issue number1-2
DOIs
Publication statusPublished - 2004 Apr 15

Fingerprint

martensite
Martensite
Damping
damping
Magnetic fields
magnetic fields
Magnetic domains
Hot Temperature
Crystal defects
Domain walls
Stacking faults
magnetic domains
Dislocations (crystals)
crystal defects
domain wall
defects

All Science Journal Classification (ASJC) codes

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

Cite this

Lee, Young-Kook ; Ha, Tae Joong ; Jun, Joong Hwan ; Choi, Chong Sool. / Effects of thermal ε martensite content and deformation on damping capacity of a Co-32 wt.% Ni alloy. In: Materials Science and Engineering A. 2004 ; Vol. 370, No. 1-2. pp. 468-472.
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abstract = "The damping capacity of Co-32 wt.{\%} Ni alloy was investigated as a function of the amount of thermal and strain-induced ε martensite under non-magnetic and 900 Oe magnetic fields, respectively. The damping capacity of the Co-32 wt.{\%} Ni alloy containing ε martensite without magnetic field consists of the magneto-mechanical damping capacity of mainly α phase, damping capacities of α and ε phases without magneto-mechanical damping effect. Under a magnetic field of 900 Oe, the more the thermal ε martensite mass fraction the higher the damping capacity. However, the damping capacity of the deformed Co-32 wt.{\%} Ni alloy with the strain-induced ε martensite decreases with increasing deformation degree despite the increase in total ε martensite fraction, because the lattice defects like dislocations introduced during deformation act as barriers to movement of damping sources such as magnetic domain walls, stacking faults boundaries in both α and ε phases, and α/ε interfaces.",
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Effects of thermal ε martensite content and deformation on damping capacity of a Co-32 wt.% Ni alloy. / Lee, Young-Kook; Ha, Tae Joong; Jun, Joong Hwan; Choi, Chong Sool.

In: Materials Science and Engineering A, Vol. 370, No. 1-2, 15.04.2004, p. 468-472.

Research output: Contribution to journalArticle

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AB - The damping capacity of Co-32 wt.% Ni alloy was investigated as a function of the amount of thermal and strain-induced ε martensite under non-magnetic and 900 Oe magnetic fields, respectively. The damping capacity of the Co-32 wt.% Ni alloy containing ε martensite without magnetic field consists of the magneto-mechanical damping capacity of mainly α phase, damping capacities of α and ε phases without magneto-mechanical damping effect. Under a magnetic field of 900 Oe, the more the thermal ε martensite mass fraction the higher the damping capacity. However, the damping capacity of the deformed Co-32 wt.% Ni alloy with the strain-induced ε martensite decreases with increasing deformation degree despite the increase in total ε martensite fraction, because the lattice defects like dislocations introduced during deformation act as barriers to movement of damping sources such as magnetic domain walls, stacking faults boundaries in both α and ε phases, and α/ε interfaces.

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