Abstract
Mechanical grinding (MG) of gas atomized Al–7.9 mass%V–4mass%Fe alloy powder was performed for various times up to 396 ks with a low energy ball mill. The bulk material with a size of φ8 mm × 300 mm was made of the powder subjected to MG for 72 ks (72 ks–MG powder) by warm extrusion. The gas atomized powder has a spherical shape with an average diameter of about 31 μm and the structure consists of Al, icosahedral and Al11V phases. The 72 ks–MG powder has a flattened spherical morphology and the structure consists of icosahedral and Al phases. The extruded bulk material of the 72 ks–MG powder also consists of icosahedral and Al phases and has a high packing density of approximately 100%. The tensile strength (σUTS), plastic elongation (eP), Vickers hardness (HV) and Young's modulus at room temperature for the extruded bulk alloy are 588 MPa, 3.5%, 180 and 83.4 GPa, respectively, and the σUTS, eP and HV at 573 K are 306 MPa, 3.2% and 90, respectively. Thus, the bulk material is concluded to have high stiffiness and high elevated-temperature strength.
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