El-Samrah Moamen G, Nabil Islam M, Shamekh Mohamed E, Elmasry M, Osman M
Nuclear Engineering Department, Military Technical College, Kobry El-kobbah, Cairo, Egypt.
Physics Department, Faculty of Science, Fayoum University, Fayoum, Egypt.
Sci Rep. 2024 Nov 5;14(1):26721. doi: 10.1038/s41598-024-76177-4.
In this study, the microstructure and elemental analysis of aluminum-copper alloy type-2024, Al-2024, and aluminum-manganese alloy type-3003, Al-3003, have been investigated by using a scanning electron microscope (SEM) equipped with Energy dispersive spectroscopy (EDS) detector. Experimental and theoretical radiation shielding studies were performed to assess the radiation shielding capabilities of the studied alloys. Considering the radiation shielding theoretical assessment, some reliable software tools were used, such as Phy-X/PSD, MCNP5, NXCom, and MRCsC. The microstructural observations and results have shown the presence of second phases rich with the main alloying elements in both alloys. Considering Al-2024 alloy, coarse second-phase particles, having a size range of 8-15 μm, were found aligning in lines parallel to the rolling direction, whereas smaller ones, having a size range of 2-8 μm, were found decorated the grain boundaries. Also, dark holes represent the pull-out large particles separated during preparation indicated poor adhesion with the main matrix that could be a result of losing particle coherency with the matrix where the misorientation in-between the atomic planes increase. However, better adhesion of the second-phase particles with the matrix, which were found possessing smaller particle size, have been observed in the Al-3003 alloy indicating good coherency and better manufacturing process for the non-heat-treatable alloy. The second-phase particles in case of Al-2024 alloy were found containing significant content of high-Z elements like Cu with greater volume fraction equals 7.5%. On the other side, Al-3003 alloy has possessed second-phase particles which lack of high-Z elements with only volume fraction equals 3.5%. All the former besides the higher density and content of high-Z elements like copper in Al-2024 alloy in compare to Al-3003 alloy and pure aluminum, led to relatively better radiation shielding capabilities against energetic photons, the highest in the low energy band and decreases with the increase of the photon energy, and slight superiority in the case of fast neutrons with only 3%inc. over pure aluminum. For instance, the radiation protection efficiency (RPE) values dropped from about; 23.2, 21.6, and 20.8% at 0.100 MeV to only 5.7, 5.9, and 5.6% at E = 2 MeV, for; Al-2024, Al-3003, and Al-Pure, respectively."Please check and confirm that the authors and their respective affiliations have been correctly identified and amend if necessary.""confirmed".
在本研究中，使用配备能谱仪（EDS）探测器的扫描电子显微镜（SEM）对2024型铝铜合金（Al-2024）和3003型铝锰合金（Al-3003）的微观结构和元素进行了分析。开展了实验和理论辐射屏蔽研究，以评估所研究合金的辐射屏蔽能力。在辐射屏蔽理论评估方面，使用了一些可靠的软件工具，如Phy-X/PSD、MCNP5、NXCom和MRCsC。微观结构观察和结果表明，两种合金中均存在富含主要合金元素的第二相。对于Al-2024合金，发现尺寸范围为8-15μm的粗大第二相粒子沿平行于轧制方向排列成行，而尺寸范围为2-8μm的较小粒子则分布在晶界处。此外，暗孔表示制备过程中分离出的拔出大颗粒，表明与基体的附着力较差，这可能是由于原子面之间的取向差增加导致粒子与基体失去相干性的结果。然而，在Al-3003合金中观察到第二相粒子与基体的附着力更好，这些粒子尺寸较小，表明该不可热处理合金具有良好的相干性和更好的制造工艺。发现Al-2024合金中的第二相粒子含有大量高Z元素，如Cu，其体积分数更高，等于7.5%。另一方面，Al-3003合金的第二相粒子缺乏高Z元素，体积分数仅为3.5%。与Al-3003合金和纯铝相比，Al-2024合金中除了具有更高的密度和铜等高Z元素含量外，还具有相对更好的对高能光子的辐射屏蔽能力，在低能带中最高，并随着光子能量的增加而降低，在快中子情况下比纯铝略有优势，仅增加3%。例如，对于Al-2024、Al-3003和纯铝，辐射防护效率（RPE）值从0.100 MeV时的约23.2%、21.6%和20.8%降至E = 2 MeV时的仅5.7%、5.9%和5.6%。“请检查并确认作者及其各自的 affiliations 是否已正确识别，如有必要请进行修改。”“已确认”
