Abstract
Iron aluminium alloys, especially those sintered from elemental powders, suffer from low ductility. In this paper, an iron aluminium alloy (Fe40Al) produced by pressure-assisted induction sintering from elemental powders is shown and described. Samples produced by this method show an unexpectedly high ductility in the compression test that is an order of magnitude higher than the literature values. Microstructural observations show plastic behaviour with significant deformation of the grains and a lack of decohesion. At the same time, the tensile properties of these samples remain at much lower levels. An attempt to explain this phenomenon is made and described in this paper.
Highlights
Fe40Al sinters obtained by the pressure-assisted induction sintering (PAIS) method were shown to have high ductility at room temperature during the compression test
What is the cause of this low hardness? All indications are that this characteristic is caused by a very low concentration of thermal vacancies
Thermal vacancies do not arise during PAIS sintering; Thermal vacancies occur, but for some reason they are not frozen in the structure of the sintered materials
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Alloys based on intermetallic phases have been intensively studied for several decades. The results of the first studies were very promising and indicated that alloys based on phases from the Fe–Al or Ni–Al system have the potential to replace expensive stainless steels in the industry [1,2]. To be practically applicable, in addition to many advantages, such as low density, good corrosion and oxidation resistance, and high strength at room and elevated temperatures, the phases from the Fe–Al system should be characterised by good or at least reasonable ductility and impact toughness
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