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研究了微量Cr和脉冲磁场对Al-5.3Fe合金凝固组织和高温力学性能的影响。结果表明,在Al-5.3Fe合金中单独添加微量(0.3%)Cr,初生Al3Fe相由粗大的板片状或长针状转变为较大的花朵状。电压在0~250V范围内,随放电电压的增加,添加0.3%的Cr的Al-5.3Fe合金凝固组织逐步细化,初生Al3Fe相由较大的花朵状逐渐变为细小的颗粒状。在微量Cr和脉冲磁场共同作用下,Al-5.3Fe合金高温抗拉强度和伸长率分别达到了147.5MPa和1.85%,比未经任何处理的Al-5.3Fe合金,分别提高了48.4%和172.1%。
The effects of Cr and pulsed magnetic fields on the microstructure and mechanical properties of Al-5.3Fe alloy were investigated. The results show that the addition of trace amounts of Cr (0.3%) to the Al-5.3Fe alloy, the primary Al3Fe phase from coarse plate or long acicular into larger flowers. With the increase of the discharge voltage, the solidified microstructure of Al-5.3Fe alloy with 0.3% Cr addition gradually refined, and the primary Al3Fe phase gradually changed from larger flower shape to fine granular shape. The tensile strength and elongation at elevated temperatures of Al-5.3Fe alloy reached 147.5MPa and 1.85% respectively with the addition of trace Cr and pulsed magnetic field, which were increased by 48.4% and 172.1% respectively compared with those of Al-5.3Fe alloy without any treatment %.