High-strength aluminum alloys play an important role in aircraft manufacturing,espe-cially helicopter manufacturing,due to their light weight and excellent mechanical properties.The properties of these alloys can be further enhanced by employing additive manufacturing techniques and heat treatment processes.This study focused on the effect of heat treatment process on the mi-crostructure and mechanical properties of 7075 aluminum alloy with ZrCuAlNi addition.By system-atically investigating the parameters of solution treatment and aging treatment,including time and temperature,the hardness of the heat-treated alloy was significantly increased to 189.1 HV.The tensile properties of the alloy were significantly improved,with the tensile strength (UTS),yield strength (YS) and elongation (EL) reaching 566.75 MPa,519.97 MPa and 6.84％.In this pa-per,the microstructural changes in the heat treatment process and the mechanism of its effect on the improvement of mechanical properties were analyze in detail,which would provide a theoretical basis and practical guidance for the heat treatment process of high-strength aluminum alloys.
关键词
直升机/激光粉末床熔融/高强铝合金/固溶时效处理/微观组织/力学性能
Key words
helicopter/laser powder bed melting/sigh-strength aluminum alloy/solution aging treatment/microstructure/mechanical properties
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