準結晶を含むガス噴霧Ａｌ‐７．８％Ｖ‐４％Ｆｅ合金粉末の押出成形と耐熱強度
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概要
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The bulk material with a size of about φ8 mm × 300 mm was produced by extrusion of gas atomized Al–7.8 mass%V–4 mass%Fe alloy powder at 623, 673 and 723 K. The gas atomized powder consists of icosahedral, fcc–Al and Al11V phases and has a spherical shape with an average diameter of about 31 μm. The bulk material extruded at 623 K consists of icosahedral and Al phases and has a high packing density of approximately 100%. The ultimate tensile strength (σUTS), plastic elongation (εP), Vickers hardness (HV) and Young's modulus (E) at room temperature are 585 MPa, 4.5%, 190 and 84.8 GPa, respectively. And then the σUTS, εP and HV at 573 K are 305 MPa, 5.0% and 90, respectively. The HV remains unchanged even after holding for 432 ks at 573 K. The coefficient of thermal expansion is 21.4 × 10−6K−1, which is smaller by 15% than that of the 7075–T6 alloy. The bulk materials extruded at 673 and 723 K also have the similar high elevated temperature strength of 291 and 277 MPa, respectively, at the temperature 573 K. The extruded bulk materials with high elevated-temperature strength are expected to develop as a new type of high strength material.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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