Microstructure of Al-2.5Fe Binary Alloy Fabricated by Laser Powder Bed Fusion
Microstructure of Al-2.5Fe Binary Alloy Fabricated by Laser Powder Bed Fusion
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DOI：
10.4028/www.scientific.net/msf.1016.1175
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发表时间：
2021-01
期刊：
影响因子：
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通讯作者：
X. Qi;N. Takata;Asuka Suzuki;M. Kobashi;M. Kato
中科院分区：
文献类型：
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作者：
X. Qi;N. Takata;Asuka Suzuki;M. Kobashi;M. Kato
研究了激光粉末床熔化（LPBF）制备的近共晶Al-Fe二元合金（Al-2.5wt%Fe）的组织和晶体学特征。在室温下，使用3D Systems ProX 200在204 W的激光功率和0.6 m/s和0.8 m/s的激光扫描速度下操作，对Al-Fe合金粉末进行LPBF处理，以制造具有高于99%的高相对密度的立方体样品。所制造的样品表现出特征的微观结构组成的一些熔池中的区域已局部熔化，并通过激光照射在LPBF过程中快速固化。在所观察到的熔池中，在α-Al基体中发现了大量平均尺寸小于100 nm的Al-Fe金属间化合物的细小颗粒，而相对粗化的颗粒位于熔池边界附近。电子背散射衍射（EBSD）分析表明，α-Al晶粒呈柱状，平均尺寸约为10 μm。LPBF制造的Al-Fe合金表现出约90 HV的高硬度，其比常规铸造的Al-Fe合金高两倍以上。
In the present study, microstructural and crystallographic features of an Al-Fe binary alloy with a near eutectic composition (Al-2.5wt%Fe) fabricated by laser powder bed fusion (LPBF) process were examined. The LPBF processing for the Al-Fe alloy powder was conducted at room temperature using a 3D Systems ProX 200 operating at a laser power of 204 W and a laser scan speed of 0.6 m/s and 0.8 m/s to fabricate cube samples with high relative density above 99 %. The fabricated sample exhibited characteristic microstructure consisting of a number of melt pools in which the regions had locally melted and rapidly solidified by laser irradiation during the LPBF process. Numerous fine particles of Al-Fe intermetallics with a mean size below 100 nm were found within the α-Al matrix in the observed melt pools, whereas relatively coarsened particles were localized around melt pool boundaries. Electron backscatter diffraction (EBSD) analyses revealed a number of columnar a-Al grains with a mean size of approximately 10 μm. The LPBF-fabricated Al-Fe alloy exhibits a high hardness of approximately 90 HV, which is more than twice higher than the conventionally casted Al-Fe alloy.