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Effect of die coating on surface crack depth of hot extruded 7075 aluminum alloy

Friction 2023年第7期11卷 1212-1224页

作者： Tatsuya FUNAZUKA Kuniaki DOHDA Norio TAKATSUJI Chengliang HU ngernbamrung sukunthakan Faculty of Engineering University of ToyamaToyama 9308555Japan Department of Mechanical Engineering Northwestern UniversityEvanston 60201USA Institute of Forming Technology&Equipment School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200030China Metal and Manufacturing Process Research Group National Metal and Materials Technology CenterPathumthani 12120Thailand

The aluminum alloys belonging to the 7000 series are high-strength alloys used in a wide variety of products for weight *** are primarily used in the field of transportation and *** these,the A7075 alloy has the highest strength and is expected to be applicable in a wide range of fields,such as aircraft components and sports ***,it has high deformation resistance and is prone to surface defects,which is called *** typically occurs at high temperatures and high ram speeds,and adversely affects *** localized melting of Zn and additive compounds,due to the heat generated during the process,is considered to cause *** this study,the effect of friction,heat,and tearing at the tool-metal interface was mitigated by improving the die surface *** reduced friction eliminated recrystallization by preventing the temperature from increasing to recrystallization *** addition,an AlCrN coating was adopted instead of nitriding to improve the die surface *** tearing size and heat generated when using the AlCrN coating were found to be ***,the grain size observed in the tearing region on the extruded surface was *** simulations using the shear friction coefficient m observed from friction tests indicate that the use of the AlCrN coating improved the material ***,the AlCrN coating is considered effective for reducing friction at the interface and preventing the recrystallization of the extruded *** the aforementioned results,it can be inferred that a die coating can reduce the tearing sensitivity and increase the productivity of the A7075 alloy.

关键词： hot extrusion 7075 aluminum alloy die coating tearing

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