Frictional behavior during cold ring compression process of aluminum alloy 5052

查看全文 作　　者：Dawei [1]ZHANG;Guangcan [1]YANG;Shengdun [1]ZHAO

机构地区：[1]School of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049,China

出　　处：《Chinese Journal of Aeronautics》索引2021年第34卷第5期,共18页

基　　金：supports of the National Natural Science Foundation of China(No.51675415)。 摘　　要：The friction is the considerable boundary condition in bulk metal forming.In this paper,the ring compression test was used to evaluate the friction coefficient and factor in Coulomb friction model and Tresca friction model for the plastic deformation of aluminum alloy AA5052.The micro-macro analysis method combining surface morphology and micro-texture was used to explore the friction behaviors in AA5052 cold forming process.In general,the magnitude(μor m)of friction changes before and after a deformation threshold during ring compression.The maximum change rate of the magnitude(μor m)before and after the deformation threshold is close to 18.5%under the present experimental conditions,and the change rate decreases with increasing loading speed.The lubrication using MoS_(2) is better than that using oil at lower speeds(0.15 mm/s,1.5 mm/s),but the lubrications for MoS_(2) and oil are similar at higher speeds(15 mm/s).The surface roughness,three-dimensional topography,and surface texture of compressed ring have a sudden change around the deformation threshold,which deviate from the previous evolution trend.The increased friction after deformation threshold also promotes the formation of sufficient shear strain layer in the subsurface plane of the compressed ring,and then it hinders the formation of the typical deformation textures withβ-oriented line and promotes the appearance of shear textures such as{001}(110),{111}(uvw)and{hkl}{110)textures. 关键词：Deformation threshold Magnitude of friction Ring compression test Shear texture Surface feature

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Frictional behavior during cold ring compression process of aluminum alloy 5052

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