累進式背擠製加工方式對A6061鋁合金材料性質之影響

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題名:	累進式背擠製加工方式對A6061鋁合金材料性質之影響
作者:	楊偉翔;Yang,Wei-Hsiang
貢獻者:	機械工程學系
關鍵詞:	累進式背擠製;超細晶粒
日期:	2016-08-29
上傳時間:	2016-10-13 14:58:23 (UTC+8)
出版者:	國立中央大學
摘要:	本文採用由Fatemi-Varzaneh等人所提出的累進式背擠製法(Acumulative back extrusion, ABE)，於室溫中對6061鋁合金加工，藉由劇烈塑性變形(Severe plastic deformation, SPD)達到超細晶粒(Ultrafine-grained, UFG)材料。為探討經ABE擠製後材料性質，將透過實驗與模擬，搭配不同的加工方式(正循環、逆循環、胚料反置)，並配合硬度、微觀結構與有限元素的模擬分析。從有限元素模擬分析與實驗比較，結果獲得良好的一致性。不同的加工方法皆會影響材料的加工硬化與硬度均勻程度之變化。而本研究能夠生產出跟傳統ABE加工方式相比，均勻性更佳之材料，且可得到奈米等級、擁有高角度之晶界。;The project used the method of Accumulative Back Extrusion (ABE) which was proposed by Fatemi-Varzaneh, the work used the AA6061 in the room temperature processing, then through the Severe Plastic Deformation (SPD) to reach the Ultrafine-Grained (UFG).In order to probe materials from ABE, through the experiments and simulations, we would use the different processing methods, for example, Positive Cycle, Reverse Cycle and Blank Molding Transposed, then combined with the hardness, micro structure and simulation analysis of Finite Element Method (FEM). Comparing the simulation analysis and experiment result of FEM, it showed good agreement. As the result, we could find out that different methods would affect the material of process hardening and the uniformity of Hardness. In this project, it can have better uniformity of materials from traditional ABEed processing, then get the Nano-scale, high-angle grain boundary.
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