溶射法によるAl-8wt%Fe急冷合金粉熱間押出し材の機械的性質におよぼす焼鈍の影響について

概要

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Rapidly solidified Al-8 wt%Fe alloy powders were produced by flame spraying method. The powders were cold pressed to billet and then hot-extruded at the temperature 573 K and the extrusion ratio of 41 to rod of 5 mm diameter. The influence of annealing of mechanical properties of extruded materials was investigated. Results obtAlned were as follows: (1) Mechanical properties of as-extruded materials were as follows: tensile strength; 37kgf/mm2, elongation; 9.5%, proof strength (0.2%); 27 kgf/mm2 and hardness; 100 kgf/mm2. These mechanical properties measured at room temperature were mAlntAlned up to 773 K of annealing for 1 hour. Beyond that, opposite to the increase of elongation, the other mechanical properties decreased with the annealing temperature. (2) At the annealing temperature 773 K, hardness was decreased rapidly with the prolong of annealing time. The same tendency against annealing time was observed in the X-ray diffraction experiment; the X-ray intensity of AlmFe (m=4.4) metastable phase was increased rapidly with the prolong of annealing time. The mechanism of strengthening of rapidly solidified Al-Fe alloys is thought to be the dispersion strengthening, and fine AlmFe particles formed during solidification might play a role of dispersoids.
社団法人粉体粉末冶金協会の論文