【摘要】 为获得铝包铜（aluminum-copper-clad,简称ACC）复合管行星轧制的加工窗口,对3003铝合金的热压缩变形进行模拟研究。采用Arrhenius及Z参数模型,建立3003铝合金本构方程,对其进行应变修正,同时采用动态材料模型理论建立该合金在不同应变量下的加工图,研究变形速率与变形温度等参数对3003铝合金性能的影响,并通过扫描电镜观察与分析在不同条件下压缩变形样品的显微组织。结果表明:3003铝合金热压缩变形的流变应力随变形温度升高、随应变速率下降而下降,在较高变形温度下出现动态再结晶现象;所得本构方程可精确预测该合金热变形过程中的流变应力,合金加工图中主要存在3个效率峰区:350⁵70 K,0.01⁰.04 s^-1,对应效率值23%³7%;375⁵00 K,6¹0 s^-1,对应效率值4.6%⁶.6%;650⁷73 K,0.01¹0 s^-1,对应效率值19%²4%。变形温度较低的效率峰区处于失稳区内,而高温效率峰区下不存在失稳区,变形组织均匀。更多还原

【Abstract】 In order to obtain the processing window of aluminum-copper-clad（ACC） bimetallic tube during three-roll planetary rolling, the physical simulation on 3003 aluminum alloy of ACC bimetallic tube was studied. Constitutive equation of 3003 alloy was established based on the Arrhenius model and Z parameters model, which were modified by view of strain. The processing maps under different strains were built based on Dynamic Material Model（DMM）, and the effects of strain rates and deformation temperatures on workability of 3003 aluminum alloy were discussed. Microstructures of compression samples under different deformation parameters were observed and analyzed by scanning electron microscopy. The results show that during hot deformation, flow stress of 3003 aluminum alloy decreases with increasing deformation temperature and decreasing strain rate, and dynamic recrystallization occurs in a relatively high temperature. The establishment of the constitutive equation can accurately predict the flow stress of 3003 aluminum alloy during hot compression. Three domains with high efficiency are found in processing map: 350-570 K, 0.01-0.04 s^-1, efficiency 23%-37%; 375-500 K, 6-10 s^-1, efficiency 4.6%-6.6%; 650-773 K, 0.01-10 s^-1, efficiency 19%-24%. Efficiency peak domains under low temperatures distribute in instability areas, while the high temperature efficiency peak areas with uniform microstructure have no instability parameters.更多还原