Ａｌ‐Ｆｅ‐Ｃｒ‐Ｔｉ‐Ｍｍ（Ｍｍ：ミッシュメタル）およびＡｌ‐Ｖ‐Ｆｅ‐Ｍｍ合金Ｐ／Ｍ材の組織と機械的性質

Abstract

Al-Fe-Cr-Ti and Al-V-Fe alloys prepared by the powder metallurgy (P/M) process have high strength exceeding 600 MPa, high-elevated temperature strength exceeding 300 MPa after holding for 100 hours at 573 K and more excellent wear resistance than commercial A390 aluminum alloy. In this work mechanical properties of the P/M Al93Fe3Cr2Ti2 and Al94V4Fe2 alloys were found to be improved by the addition of misch metal (Mm). P/M Al92Fe3Cr2Ti2Mm1 alloys containing quasicrystalline phase were prepared by extrusion of argon gas atomized powders at 673 K, where the atomized powders sieved into the sizes smaller than 75μm were used. The P/M Al92Fe3Cr2Ti2Mm1 alloy has a mixed structure consisting of Al, quasicrystal and compounds phases and exhibits good mechanical properties as follows: ultimate tensile strength (σUTS) of 680±13 MPa, 0.2% proof strength (σ0.2) of 670±10 MPa, plastic elongation (eP) of 0.3±0.1%, Young's modulus (E) of 91±3 GPa and Vickers hardness (Hv) of 230±3, respectively, at room temperature, and alas of 347±5 MPa, σ0.2 of 315±3 MPa and eP of 1.8±0.3%, respectively, after holding for 100 hours at 573 K.