Abstract
Abstract In the present paper, the structure and properties of a Al–Cr–Fe–Ti alloy produced by powder metallurgy are described. An initial rapidly solidified powder alloy was prepared by the pressure nitrogen melt atomisation. Subsequently, the granulometric powder fraction of less than 45 μm was hot-extruded. According to X-ray diffraction and transmission electron microscopy observation, the compact material is composed of α-Al grains and spheroids of intermetallic phases. The α-Al grains of the compacted material are recrystallized and neither residual stress nor texture were observed. The values of ultimate tensile strength and yield strength of the investigated material were similar to the values for conventional Al-based alloys. Dependences of ultimate tensile strength and yield strength on temperature were also measured. Excellent thermal stability of the powder metallurgy produced Al–Cr-based material was proven by room-temperature hardness measurement after long-term annealing at elevated temperature.
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