【正文】 隨含F(xiàn)e量的增加急劇下降，且烤漆過程中常伴有軟化現(xiàn)象 [1418]。一般來說，晶粒尺寸為25μm時，基本上可以避免板材對呂德斯線的敏感性；晶粒尺寸超過45μm時，板材將出現(xiàn)明顯的呂德斯線，因早期的縮頸變形引起成形性下降。這兩個合金既可以單獨用來做內(nèi)外層壁板，也可用AA6009合金制造內(nèi)層壁板，而用AA6010合金制造外層壁板，兩個合金的廢料不需分離，可以混合回收后自身使用或做鑄件的原料 [6]。但這種材料在低溫人工時效時表現(xiàn)為強度下降，烤漆時要獲得足夠的強度，則需要較高的溫度和較長的時間。特別是 1+4熱連軋的升級改造，使其鋁加工熱軋設(shè)備達到世界先進水平，中南大學(xué)碩士學(xué)位論文 第一章 文獻綜述3為我國車身用鋁合金板的發(fā)展創(chuàng)造條件。目前汽車工業(yè)的先進技術(shù)均掌握在發(fā)達國家和跨國公司手中，由于相關(guān)的工業(yè)設(shè)計、材料標準、關(guān)鍵專利技術(shù)等都受到嚴格的知識產(chǎn)權(quán)保護，從而嚴重制約了我國汽車工業(yè)的發(fā)展。我國鋁資源豐富，應(yīng)用鋁及鋁合金無疑是汽車產(chǎn)業(yè)蓬勃發(fā)展的重要保證，因此中南大學(xué)碩士學(xué)位論文 第一章 文獻綜述2研究和開發(fā)汽車用鋁合金具有重要的意義。用鋁合金材料作為汽車車身內(nèi)外板代替?zhèn)鹘y(tǒng)碳鋼板，可使車身減重大約47%，%。關(guān)鍵詞： 5182 鋁合金，溫變形行為，拉深成形，本構(gòu)方程，微觀組織，成形性能中南大學(xué)碩士學(xué)位論文 ABSTRACTABSTRACTLightweight materials in automotive applications have bee a hot issue on the auto industry. 5182 aluminum alloy has bee one of the automotive lightweight materials because of its excellent mechanical properties and forming properties. In this paper，the temperature deformation behavior and drawing performance of 5182 aluminum alloy were studied in order to provide the basis for the further development and optimization of 5182 aluminum body sheets. Through the simple temperature tensile test on the 5182 aluminum alloy in 50~300℃temperature, ~ strain rate stress range， temperature tensile deformation behaviors were explored. The true stressstrain curves were obtained. Using the improved FieldsBackofen equation and fitting the values of n， m and C， the constitutive equation of 5182 aluminum alloy was established on different deformation temperature and strain rates. Through the microscope， scanning electron microscopy and transmission electron microscopy， the Microstructure and fracture after deformation were observed and analyzed. Dynamic recovery and recrystallization in the process of temperature deformation were studied.Furthermore, through the warm drawing experiments, the paper has researched the warm forming performance and technology of 5182 aluminum alloy, and analyzed its fracture behavior of the drawing process. Under the technological condition of forming temperature 250℃， blank holder force ， drawing speed semisolid lubricant， 5182 aluminum alloy can gain optimum drawing performance， and the drawing limit ratio (LDR) can reach . In the drawing process， the cracks in the flange fillet with straight edge have formed and expanded by the transitional region adjacent the straight wall， which eventually led sheet fracture.The strain hardening index value (n) is the best parameter to assess the drawing performances of the 5182 aluminum alloy sheet. In the same deformation temperature， greater the n value is， greater the drawing limit ratio (LDR) is. However, in different deformation temperature, the forming performance of 5182 aluminum alloy sheet depends mainly on the result of the interaction between plastic deformation ability and strain hardening capacity. With the increase in temperature deformation, n values decrease, but LDR values bee bigger gradually and reach the maximum. Subsequently, n values continue to decrease, but LDR values begin to decline gradually.Key words: 5182 aluminum alloy, warm deformation behavior, drawing, constitutive equation, microstructure evolution, forming properties中南大學(xué)碩士學(xué)位論文 目錄I目 錄第一章 文獻綜述 ..........................................................................................................1 引言 .........................................................................................................................................1 汽車用鋁合金板的發(fā)展及研究現(xiàn)狀 .....................................................................................2 國內(nèi)外的發(fā)展概況 ..........................................................................................................2 2022 系和 6000 系汽車用鋁合金板 ................................................................................3 5000 系汽車用鋁合金板 ..................................................................................................3 汽車用鋁合金板存在的問題 ..........................................................................................4 汽車用鋁合金板成形特性 .....................................................................................................5 鋁合金板材成形的分類 ..................................................................................................6 鋁合金板材的成形性能 ..................................................................................................8 提高鋁合金板成形性的特殊成形法 ............................................................................10 鋁合金的溫拉伸變形行為 ...................................................................................................11 流變應(yīng)力應(yīng)變曲線特征 ..............................................................................................12 本構(gòu)方程的研究 ............................................................................................................12 微觀組織演變 ................................................................................................................14 鋁合金板材溫成形工藝的研究現(xiàn)狀 ...................................................................................16 溫度組合模式的影響 ....................................................................................................16 壓邊力的影響 ................................................................................................................16 潤滑條件的影響 ............................................................................................................17 其他成形條件的影響 ....................................................................................................17 本課題研究的目的和意義 ...................................................................................................18第二章 實驗過程與方法 ....................................................