Development of High Damping Ferrous Shape Memory Alloys

Abstract

Alloys which exhibit high damping have potential in applications for noise and vibration controls. The damping mechanism in these alloys is generally related to the hysterestic effect of microstructural interfacial motions. For example, damping in Fe-Cr-Al alloys is due to the stress induced motion of ferromagnetic domain boundaries. Shape memory alloys, such as Cu-Al-Ni, Cu-Zn-Al and NiTi, also exhibit high damping due to the motion of martensitic interfaces which can be driven by the excitation stress. However, the mechanical properties of shape memory alloys are highly temperature dependent in the range of the martensitic transformation. The modulus of these alloys is also quite low in the martensitic state making them less suitable for structural applications. The shape memory effect has been observed in ferrous alloys including Fe-Mn, Fe-Ni and Fe-Al based alloys as well as Fe-Pt and Fe-Pd alloys. These alloys, exhibiting a less perfect shape memory effect than do conventional shape memory alloys, have certain characteristics, such as higher modulus, better thermal stability and potentially lower cost, which could make them more suitable for structural damping applications.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1990
Accession Number
ADA233543

Entities

People

  • Ming H. Wu

Tags

Communities of Interest

  • Human Systems
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Alloys
  • Dispersion Hardening
  • Electron Microscopy
  • Ferromagnetic Domains
  • Iron Alloys
  • Martensite
  • Mechanical Properties
  • Military Research
  • Neel Temperature
  • Plastic Deformation
  • Shape Memory Alloys
  • Stress Strain Relations
  • Stresses
  • Thermal Stability
  • Transitions
  • Transmission Electron Microscopy
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.
  • Structural Dynamics.