Effect of Copper Addition on Crystallization and Properties of Hafnium Containing HITPERM Alloys

Abstract

This paper presents properties and nanocrystallization characteristics of HITPERM based Fe68.8Co17.2Hf7Cu1B6 and Fe69.6Co17.4Hf7B6 alloys. Both alloys differing only in copper content were subjected to series of characterizations in order to study the effect of copper. Evolution of magnetic properties as a function time has been investigated by isothermal annealing experiments and optimum annealing conditions of amorphous precursors have been reported. Resulting magnetic properties (AC and DC) measured at room temperature are presented. Nanocrystallization kinetics studied by using time dependant magnetization measurements was discussed in the framework of Johnson-Mehl-Avrami model. Results of thermal stability measurements conducted in air at 500 K for up to 1000 hours are reported.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 2010
Accession Number
ADA530148

Entities

People

  • J. C. Horwath
  • L. Christy
  • Mingxiong Huang
  • Z. Turgut

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Annealing
  • Crystal Structure
  • Crystallization
  • Curie Temperature
  • Grain Size
  • Heat Of Activation
  • Laboratory Magnetometers
  • Magnetic Materials
  • Magnetic Properties
  • Magnetization
  • Measurement
  • Phase Transformations
  • Physics
  • Thermal Stability
  • Three Dimensional

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.