Ultrafine-Grained Surface Layer Formation of Aluminum Alloy 5083 by Friction Stir Processing

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• 作者：Reza Abdi Behnagh^a ; ^b ; Ninggang Shen^a ; Masoud Abdollahi^b ; Hongtao Ding^a ; ^{hongtao-ding@uiowa.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Friction stir processing ; Ultra-fine grain ; Surface integrity ; Aluminum ; Microstructure
• 刊名：Procedia CIRP
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：45
• 期：Complete
• 页码：243-246
• 全文大小：412 K

文摘

Friction stir processing experiments are conducted on aluminum alloy 5083 plates to enhance the surface integrity by introducing an ultrafine-grained surface layer. Microstructural analyses are carried out using optical microscopy to characterize the grain structures under various conditions. Within the produced surface layer, equiaxed ultra-fine grains are observed due to dynamic recrystallized during FSP. The grain size is reduced from 40 μm to a submicron level for the FSP rotational speed of 800 rpm. The hardness is increased to a peak value of 151 HV, which is higher than that of the unprocessed area by 50%.