The gamma/alpha'Martensitic Transformation in Fe-Mn and Fe-Mn-Co Alloys: Experiments, Thermodynamic Analysis, and Systematics of Driving Forces

P. MARINELLI; A. BARUJ; S. COTES; A. FERNÁNDEZ GUILLERMET; M. SADE

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Elsevier

Lugar: Amsterdam; Año: 1999 vol. 273 p. 498 - 502

0921-5093

A study is presented of the gamma/alpha ' martensitic transformation (MT) in Fe-Mn-Co alloys. Our work combines the experimental determination of the Ms and As temperatures with thermodynamic calculations based on Gibbs energy (Gm) models. The composition range investigated extends to the binary Fe-Mn, which leads to a detailed examination of the available MT data. This database is analysed using independently established Gm functions, and the so-called Resistance-to-Start-the-Transformation energies (RSTEs) are evaluated. A well defined pattern of the differences between RSTEs for the direct and the reverse transformations is found, and a remarkable correlation for the composition dependence of the RSTE at As is reported. The need for further experimental and theoretical studies is emphasized.