In this paper, the results of preparation and mechanical testing of AlFe7Mn4 alloy are presented. The alloy was prepared by rapid solidification (melt spinning) in the form of thin ribbons. The ribbons were compacted by spark plasma sintering in three different ways-whole, cut into stripes, and crushed into powder in a ball mill. Microstructures of compact materials were observed by scanning and transmission electron microscope. Phase composition was characterized using X-ray diffraction. Rapidly solidified ribbons contained a quasicrystalline phase, but it was transformed to stable phase during compaction independently on the ribbons pre-treatment. Bulk material prepared from whole ribbons exhibited anisotropy of microstructure and mechanical properties. Material prepared from cut stripes showed also slight preferential orientation of ribbon pieces. Crushing of ribbons in a ball mill led to contamination of the alloy powder and to deformation strengthening of bulk material.
Microstructure and mechanical properties of powder metallurgically prepared AlSi24Fe3 alloy are presented in this article. The alloy was prepared in form of rapidly solidified ribbons by melt spinning process. Consequently, the ribbons were crushed into powder in a ball mill and compacted by spark plasma sintering. Grain size of prepared alloy was less than 1 µm, Vickers hardness HV0.1 reached value 214, yield strength and ultimate compressive strength were 611 and 778 MPa, respectively. To obtain material with possible self-healing proprerties, it was necessary to enrich material by fine dispersed Ag2Al particles. The AlSi24Fe3 powder particles were sputtered by 5 nm layer of silver before sintering. The total amount of Ag in bulk sample was approximately 0.1 wt. %. The microstructure of Ag containing alloy was comparable to the basic one. The Ag nanoparticles were present on several particle boundaries. The influence of Ag presence on Vickers hardness of the material was not observed, as the values HV0.1 was 212. After a heat treatment (450 °C/ 1h), silver transformed to equilibrial Ag2Al phase, present in material in form of nanoparticles no more decorating strictly the particles boundaries.
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