田口方法於鋁合金晶粒細化最佳壓縮參數之研究

Determining Compression Parameters for Grain Refinement of Aluminum Alloys Using the Taguchi Method

余豐榮(Fong-Jung Yu) ； 李義剛(I-Kon Lee) ； 鄭哲綸(Che-Lun Cheng) ； 邱稚淳(Jhin-Chin Ciou)

《科學與工程技術期刊》 9卷2期 (2013/09) Pp. 77-85

摘要

鋁合金具有質量輕、強度高、加工性好、成形性佳等機械性質，被廣泛使用於電子3C、民生工業、自行車車架等。一般而言，細晶材料具有較高的抗拉強度及較佳延展性等機械性質。然而，高溫成形加工時，材料晶粒會有粗大化的現象，將造成對機械性質的負面影響。本研究考量變形溫度、應變速率、變形量等控制因子，以田口方法探討A6061、A6082兩種鋁合金對於晶粒細化的影響，以尋求最佳壓縮製程參數組合。研究結果顯示：應變速率為影響晶粒細化最敏感的重要因子。兩種鋁合金皆以變形溫度「460 ℃」、應變速率「10 sec^(-1)」、變形量「70 ％」之壓縮製程參數為最佳。顯微組織觀察得知，A6082明顯較A6061細化程度佳。同時，在本研究參數設計範圍，溫度愈低、應變速率愈高、變形量愈大者產生的晶粒愈細，符合晶粒細化的品質特性，可有效改善品質。

關鍵字

田口方法 ； 鋁合金 ； 壓縮 ； 晶粒細化

並列摘要

Aluminum alloys are used widely in electronic 3C industries and for manufacturing bicycle frames and products for general use because the alloys are lightweight, strong, and mallrable and ductile. The fine grains present in materials confirm the high tensile strength and ductility of alloys, but, high temperature treatments trigger the growth of crystal grains, deteriotating the mechanical properties of the alloys. In this study, experiments were conducted using the Taguchi Method to examine the impact of compression on grain refinement in wo aluminum alloys, A6061 and A6082. The goal was to determine the optimal combination of parameters for compression manufacturing, while considering deformation temperature, strain rate, and amount of deformation as control factors. The results showed that strain rate affects grain refinement the most. For both aluminum alloys, the optimal combination of compression-process parameters was a deformation temperature of 460 °C, strain rate at 10 sec^(-1), and deformation at 70%. Refinement was better in A6082 than in A6061. Within the combinations of parameters tested in this study, the design with the lower temperature, higher strain rate, and greater deformation produced grains that were more refined, consistent with the attributes of grain refinement that improve quality effectively.

並列關鍵字

Taguchi Method ； aluminum alloy ； compression ； grain refinement