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Microstructural Analysis of Nanostructured Aluminum Alloy Strips Created from Machining Based Deformation Process

机译:机加工变形过程产生的纳米结构铝合金带的显微组织分析

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Aim of present research endeavour is to fabricate nanostructured strips of aluminium alloy by a machining based deformation process. Aluminium 6061 was used as a test material. Furthermore, X-Ray diffraction (XRD) is used for deformation analysis of strips to check the level of deformation along their thickness. Microhardness testing was done using Vickers microhardness testing machine. Microstructure characterization of bulk aluminium and chips (as strips) was done by electron back scatter diffraction (EBSD). For in-depth deformation analysis thickness of strips was reduced in steps up to 100μm by abrasive papers. After each step of reducing thickness of strips by 100μm, X- ray scan and microhardness testing of strips were performed. The results show that microstrain in strips was increased and crystallite size was decreased. Moreover, hardness of the strips was ~ 40-44% more than the bulk material. Higher hardness in strips may be attributed to their ultrafine microstructure resulted from high deformation observed in strips. Furthermore, variation in deformation level along the thickness of sheets was also observed.
机译:当前研究努力的目的是通过基于机加工的变形过程来制造铝合金的纳米结构带。铝6061用作测试材料。此外,X射线衍射(XRD)用于带材的变形分析,以检查沿其厚度的变形程度。使用维氏显微硬度测试机进行显微硬度测试。块状铝和切屑(条状)的微观结构表征是通过电子背散射衍射(EBSD)进行的。为了进行深入的变形分析,砂纸将带材的厚度逐步降低至100μm。在将条带厚度减少100μm的每个步骤之后,进行条带的X射线扫描和显微硬度测试。结果表明,条带中的微应变增加,微晶尺寸减小。此外,带材的硬度比散装材料高约40-44%。条带中较高的硬度可能归因于条带中观察到的高变形所导致的超细微结构。此外,还观察到了沿片材厚度的变形水平的变化。

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