EFFECT OF ORDER-DISORDER TRANSFORMATION MODES ON THE ANOMALOUS YIELD BEHAVIOR OF FE3AL INTERMETALLIC COMPOUNDS

Abstract

Compression tests were performed to clarify the effects of transformation modes on the anomalous yield behaviour of hypo- and hyper-stoichiometric Fe3Al alloys which show a first- and a second-order transition, respectively. There were great differences in the anomalous yield behaviour depending on the transformation modes. In the first-order transformation alloy, changes in the degree of order played an important role before phase separation, while precipitation of alpha phase had a great influence on the anomalous behaviour after phase separation. In contrast, only the change in the degree of order was a dominant factor in the second-order transformation alloy.