Martensite-austenite transformation in Fe80Ni20 ball-milled powder

The martensite-austenite (MA) transformation in Fe80Ni20 ball-milled powder has been studied through neutron thermo-diffraction experiments and magnetisation vs. temperature measurements between 300 and 1100K. For the as-milled powder, the estimated size of mean coherent diffraction domains and latt...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2007-09, Vol.316 (2), p.328-331
Main Authors: MARTINEZ-BLANCO, D, GORRIA, P, PEREZ, M. J, BLANCO, J. A, SMITH, R. I
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Martensitic transformations
Materials science
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
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Summary:The martensite-austenite (MA) transformation in Fe80Ni20 ball-milled powder has been studied through neutron thermo-diffraction experiments and magnetisation vs. temperature measurements between 300 and 1100K. For the as-milled powder, the estimated size of mean coherent diffraction domains and lattice microstrains at room temperature (RT) are 11(2)nm and 0.8(2)%, respectively. The evolution of both parameters with temperature is presented and discussed. On heating the as-milled powder, the MA transformation begins above 630K (200K below the expected temperature for as-cast coarse-grained Fe80Ni20 conventional alloys) and finishes at 890K. On cooling down from high temperature, the reverse transformation occurs below 400K. These changes in the MA transformation temperatures are attributed to the initial nanostructure of the Fe80Ni20 material.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2007.03.004