Accession Number:

ADP012212

Title:

Rapid-Solidification Effect on Magnetostriction in Iron-based Ferromagnetic Shape Memory Alloy

Descriptive Note:

Corporate Author:

MARYLAND UNIV COLLEGE PARK DEPT OF MATERIALS SCIENCE AND ENGINEERING

Report Date:

2001-11-01

Pagination or Media Count:

6.0

Abstract:

Fe-29.6atPd ferromagnetic shape memory alloy FSMA ribbon formed by rapidly solidified, melt-spinning methods is expected to be useful as a new type of material which shows giant magnetostriction as well as quick response. The giant magnetostriction in the rolling direction depends strongly on applied magnetic-field direction and has a maximum value of 8 x 10exp -4 when the field is normal to the surface. This phenomenon is caused by the rearrangements of activated martensitic twin variants. The inverse phase transformation temperatures As obtained from Laser micrographs and magnetization vs. temperature curve are 307 K and 400 440 K, respectively. We analyze magnetostriction, magnetic property and crystal structure of Fe-29.6atPd bulk sample before rapid solidification and the ribbon sample. From these results. it can be concluded that remarkable anisotropy of giant magnetostriction of ribbon sample is caused by the fine structure formed by the melt-spinning method. It may be possible to apply this method successfully to other FSMA and Ni2MnGa, which is difficult to manufacture owing to its brittleness.

Subject Categories:

  • Properties of Metals and Alloys
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE