低温时效对Fe-22Al合金微观组织和力学性能的影响
发布时间：2018-07-16 20:01
【摘要】：利用金相显微镜、XRD、TEM和力学性能测试方法研究了低温时效对Fe-22Al合金的微观组织和力学性能的影响。结果表明,Fe-22Al合金经退火和固溶处理后的金相组织为粗大的等轴状晶粒,但固溶处理后晶粒尺寸有所减小。合金主要的相组成为α-Fe相以及具有B2结构的FeAl相,不存在DO3结构的Fe3Al相。存在明显的基体衍射斑点和(100)超点阵斑点意味着发生失稳有序化转变,并形成大量B2结构的有序相。暗场像结果表明存在大量Al原子的富集区和贫集区,即合金中发生了调幅分解转变。经过530℃时效处理后,合金的衍射斑点中同时存在DO3结构和B2结构的超点阵斑点。随时效的进行,逐渐发生B2→DO3相变,在B2结构的有序相内部形成大量细小的DO3相,并逐渐长大和粗化,最终形成粗大的海绵状结构。经过固溶和时效处理后,Fe-22Al合金的硬度和抗压强度分别为359HV、1610 MPa。
[Abstract]:The effect of low temperature aging on the microstructure and mechanical properties of Fe-22Al alloy was studied by means of TEM and mechanical properties test. The results show that the microstructure of Fe-22Al alloy is coarse equiaxed grain after annealing and solution treatment, but the grain size decreases after solution treatment. The main phase composition of the alloy is 伪 -Fe phase and Feal phase with B2 structure, but there is no Fe3Al phase with DO3 structure. The existence of obvious matrix diffraction spots and (100) superlattice spots means that the instability transition occurs and a large number of ordered phases with B2 structure are formed. The results of dark field images show that there are a large number of rich and poor regions of Al atoms, that is, the amplitude modulation decomposition transition takes place in the alloy. After aging at 530 鈩，
本文编号：2127521
[Abstract]:The effect of low temperature aging on the microstructure and mechanical properties of Fe-22Al alloy was studied by means of TEM and mechanical properties test. The results show that the microstructure of Fe-22Al alloy is coarse equiaxed grain after annealing and solution treatment, but the grain size decreases after solution treatment. The main phase composition of the alloy is 伪 -Fe phase and Feal phase with B2 structure, but there is no Fe3Al phase with DO3 structure. The existence of obvious matrix diffraction spots and (100) superlattice spots means that the instability transition occurs and a large number of ordered phases with B2 structure are formed. The results of dark field images show that there are a large number of rich and poor regions of Al atoms, that is, the amplitude modulation decomposition transition takes place in the alloy. After aging at 530 鈩，
本文编号：2127521
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