Solidification Structure Evolution of ZL114A Aluminum Alloy with Surface Pulsed Magnetic Field and Ce Composite Treatment AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY24060015

Chinese Library Classification Number:TG292

Citation Information:

ZL114A aluminum alloy is an Al-Si-Mg series cast aluminum alloy, renowned for its exceptional casting characteristics, comprehensive performance, and low thermal expansion coefficient. It finds extensive applications in producing intricate structural castings within the aerospace, automotive manufacturing, and construction industries. In recent years, the rapid advancement of China's aerospace industry has led to increasing demands for the service life and reliability of aluminum alloy castings. Currently, ZL114A aluminum alloy castings still face challenges such as low comprehensive performance and short service period, necessitating the urgent development of new technologies or processes to enhance the overall mechanical properties of ZL114A aluminum alloy. However, the utilization of various types of magnetic fields, including constant magnetic fields, pulsed magnetic fields, and alternating magnetic fields, to refine the solidification structure of aluminum alloy has emerged as a key area of research focus. Currently, there is limited literature on the enhanced refinement of microstructure and mechanical properties of ZL114A aluminum alloy through the composite interaction of rare earth elements and a magnetic field. This study proposed a composite treatment technology involving the application of surface pulsed magnetic field and Ce. The solidification process of ZL114A aluminum alloy was systematically investigated under the combined influence of surface pulsed magnetic field and varying Ce content. The effects of surface pulsed magnetic field and Ce compound action on the solidification microstructure, crystal structure, and hardness of ZL114A aluminum alloy were investigated by metallurgical microscopy (OM）, scanning electron microscope (SEM）, X-ray diffraction (XRD）, and Vickers hardness tester. The results showed that when Ce content was 0.15% under the action of the surface pulsed magnetic field, the solidification microstructure of ZL114A aluminum alloy had the best refinement effect, and the average grain size of the solidified structure was 95 μm, compared with the sample without composite treatment and only with 0.3%Ce, the average grain of the solidification microstructure was reduced by 39.5% and 24.4%, respectively. The eutectic Si morphology of ZL114A aluminum alloy had also changed from the original slat-shaped to a fine short rod or spherical shape. Compared with the samples with no composite treatment and only 0.3%Ce, the proportion of eutectic Si area and the average size of length diameter decreased by 20.3%, 34.8%, 9.2% and 26.1%, respectively. Compared with the samples without composite treatment, the comparison of the samples with surface pulsed magnetic field and Ce content of 0.15% promoted the accumulation of Al atoms in <111>, <200> and <220> directions, and hindered the growth of Al atoms in <311> direction, and the comparison of the non-composite samples promoted the accumulation of Si atoms in the <200>, <220> and <422>, and hindered the growth of Si atoms in <111> direction. The surface pulsed magnetic field and the composite effect of Ce were more conducive to the refinement of the solidification microstructure of ZL114A aluminum alloy α-Al grain and eutectic Si morphology, which opened up a new way for the composition design and composite process development of ZL114A aluminum alloy.