快速凝固/粉末冶金高阻尼铝合金挤压成形过程的数值模拟  

Numerical Simulation of the Forming Process of RS/PM High Damping Aluminum Alloy

作　　者：文丽芳[1] 马岳[1] 黄晨光[2] 李沛勇[3] 徐惠彬[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083 [2]中国科学院力学研究所,北京100080 [3]北京航空材料研究院,北京100095

出　　处：《航空学报》2007年第2期432-437,共6页Acta Aeronautica et Astronautica Sinica

摘　　要：采用有限元分析软件ANSYS,分析了快速凝固/粉末冶金(Rapidly Solidified/Powder Metallurgy,RS/PM)高阻尼铝合金FMS0714/10(Zn-30Al)的挤压成形过程,研究了模具与坯料间的摩擦条件和挤压比对阻尼铝合金成形过程的影响,探讨了挤压过程材料表面产生裂纹的机理,进行了成形工艺优化。研究结果表明:挤压过程中FMS0714/10(Zn-30Al)阻尼铝合金材料的流动与变形不均匀,导致了应力应变分布的不均匀:材料表面应力应变较大,芯部应力应变较小;表面过大的应变和轴向拉应力是表面裂纹的诱因;减小模具和坯料间的摩擦,增大挤压比,可以减小材料表面应力,使应变分布趋于均匀,从而减少材料表面损伤,优化材料表面质量,提高成品合格率。数值模拟的研究结果将为FMS0714/10(Zn-30Al)阻尼铝合金材料挤压工艺的制订以及新材料的设计和研制提供有益的参考。The extrusion forming process of a rapidly solidified/powder metallurgy （RS/PM） damping aluminum alloy, FMS0714/10 （Zn-30Al）,is studied using the finite element software ANSYS. The effects of friction coefficient and extrusion ratio on the forming process are investigated in a wide parametric variation region, f, 0-0.2; λ, 2. 78-8.65. Optimization of the forming process is performed to reduce the surface flaw of the material. Numerical results show that during the extrusion forming process the flow and deformation of the FMS0714/10（Zn-30Al） material are non-uniform, which results in the high stress and strain gradient. Stress and strain values near the surface are larger, while those near the center are smaller. Excessive surface strain and surface tensile stress,which are the main reasons for surface crack,can be reduced by enlarging the extrusion ratio and decreasing the friction between die and billet, thereby the material surface quality will be modified and the product qualification will be increased. The numerical simulation results can be treated as good referenees not only for constituting extrusion techniques of FMS0714/10（Zn-30Al） material,but also for designing and oreoaring new materials.

关 键 词：阻尼铝合金 成形过程 挤压 表面缺陷 数值模拟 有限元方法 

分 类 号：TB115[理学—数学] TG376.8[理学—应用数学]