Effect of extrusion texture on the compressive behavior of B2 FeAl alloys

Abstract

Over the past decade a wide range of intermetallic alloys have been investigated as potential high temperature materials. Many of these studies have used hot extrusion of prealloyed powder to achieve fully dense materials. It is well known that hot extrusion and subsequent recrystallization often result in significant crystallographic texture. Such textures have been reported in hot extruded intermetallics by a number of authors. Unfortunately, this extrusion texture has been ignored when evaluating the mechanical properties of these materials. Often, the relationship between the normal stress axis and extrusion axis is not specified. In other cases, because of size constraints, mechanical tests have been performed with the stress axis parallel with the extrusion axis. The purpose of the present work is to demonstrate the effect of extrusion texture on the apparent mechanical properties of intermetallic alloys. In the present study, three B2 Fe-Al alloys were studied. The first was produced by double hot extrusion of prealloyed Fe-40at%Al elementally blended with 0.05wt%B. This material is referred to as powder extruded. The other materials were produced by hot extrusion of cast billets of Fe-40at%Al Fe-40at%Al+0.1wt%B. These materials are referred to as cast-extruded materials.