Rapidly solidified blanks of Al 8.5Fe 1.3V 1.7Si aluminum alloy were prepared by using two methods of cold isostatically pressing of atomized powder and spray deposition of melt metal. Influence of processing paramete...Rapidly solidified blanks of Al 8.5Fe 1.3V 1.7Si aluminum alloy were prepared by using two methods of cold isostatically pressing of atomized powder and spray deposition of melt metal. Influence of processing parameters, such as extrusion ratio, aspect ratio of cross section of extruded product, extrusion temperature and heating time on microstructures and mechanical properties of rapidly solidified AlFeVSi aluminum alloys was studied by means of optical microscopy, X ray diffractometry, transmission electron microscopy and measurement of tensile properties. Suitable processing parameters were selected to extrude spray deposited blanks into large size pipes. The results show that the effect of extrusion ratio and aspect ratio on microstructures and mechanical properties of rapidly solidified AlFeVSi aluminum alloys can be evaluated by calculating parameter R s, and the value of R s ought to be at least close to 6 in order to obtain high performance extruded product with good binding state. With the increase of extrusion temperature and heating time, the dispersed Al 12 (Fe,V) 3Si particles congregate and coarsen in α (Al) matrix,and the coarse lumpish θ Al 13 Fe 4 phase appears in the alloy extruded above 500 ℃. Therefore, lowering extrusion temperature and shortening exposure time at high temperature through multistage heating are of benefit to changing microstructures and improving mechanical properties of the extruded product. The large size pipes of spray deposited AlFeVSi aluminum alloy extruded at 490 ℃ in the condition of R s being close to 6 and multistage heating have excellent tensile strength and plasticity at room and higher temperature.展开更多
In this paper, the composition, two-dimensional and three-dimensional microstructure of heat-resistant wrought aluminum alloy with strong oxidation resistance, heat resistance and easy processing are analyzed by using...In this paper, the composition, two-dimensional and three-dimensional microstructure of heat-resistant wrought aluminum alloy with strong oxidation resistance, heat resistance and easy processing are analyzed by using direct reading spectrometer, metallographic microscope and scanning electron microscope. The main alloy elements of heat-resistant forging aluminum alloy include Cu, Mg, Si, Ni and Fe. The α solid solution of each element in aluminum consists of S phase (Al<sub>2</sub>CuMg), Mg<sub>2</sub>Si phase, bright gray Al<sub>2</sub>CuNi phase and dark brown Al<sub>9</sub>FeNi phase. The distribution of each phase in the aluminum alloy is determined by the three-dimensional energy spectrum analysis of the microstructure, and the distribution of each phase in the crystal position is analyzed. The mechanism of heat resistance, easy processing type and wear resistance is obtained, which provides the theoretical basis for the development and use of heat-resistant forged aluminum alloy.展开更多
文摘Rapidly solidified blanks of Al 8.5Fe 1.3V 1.7Si aluminum alloy were prepared by using two methods of cold isostatically pressing of atomized powder and spray deposition of melt metal. Influence of processing parameters, such as extrusion ratio, aspect ratio of cross section of extruded product, extrusion temperature and heating time on microstructures and mechanical properties of rapidly solidified AlFeVSi aluminum alloys was studied by means of optical microscopy, X ray diffractometry, transmission electron microscopy and measurement of tensile properties. Suitable processing parameters were selected to extrude spray deposited blanks into large size pipes. The results show that the effect of extrusion ratio and aspect ratio on microstructures and mechanical properties of rapidly solidified AlFeVSi aluminum alloys can be evaluated by calculating parameter R s, and the value of R s ought to be at least close to 6 in order to obtain high performance extruded product with good binding state. With the increase of extrusion temperature and heating time, the dispersed Al 12 (Fe,V) 3Si particles congregate and coarsen in α (Al) matrix,and the coarse lumpish θ Al 13 Fe 4 phase appears in the alloy extruded above 500 ℃. Therefore, lowering extrusion temperature and shortening exposure time at high temperature through multistage heating are of benefit to changing microstructures and improving mechanical properties of the extruded product. The large size pipes of spray deposited AlFeVSi aluminum alloy extruded at 490 ℃ in the condition of R s being close to 6 and multistage heating have excellent tensile strength and plasticity at room and higher temperature.
文摘In this paper, the composition, two-dimensional and three-dimensional microstructure of heat-resistant wrought aluminum alloy with strong oxidation resistance, heat resistance and easy processing are analyzed by using direct reading spectrometer, metallographic microscope and scanning electron microscope. The main alloy elements of heat-resistant forging aluminum alloy include Cu, Mg, Si, Ni and Fe. The α solid solution of each element in aluminum consists of S phase (Al<sub>2</sub>CuMg), Mg<sub>2</sub>Si phase, bright gray Al<sub>2</sub>CuNi phase and dark brown Al<sub>9</sub>FeNi phase. The distribution of each phase in the aluminum alloy is determined by the three-dimensional energy spectrum analysis of the microstructure, and the distribution of each phase in the crystal position is analyzed. The mechanism of heat resistance, easy processing type and wear resistance is obtained, which provides the theoretical basis for the development and use of heat-resistant forged aluminum alloy.
