旁路送丝电弧增材制造铝铜锂合金工艺研究

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Abstract： A novel method for in-situ preparation of Al-Cu-Li aloy by bypass arc directed energy deposition is proposed.This processuses ER2319 as the main wire material and introduces 2A97strip-shaped intermediate alloy through the bypass to prepare Al-Cu-Li aloy.By analyzing the macroscopic morphology，metallographic structure， and microhardnessof straight walldepositedby different processes，the CMT-Pprocess wasselected for bypass wire arc additive manufacturing forming experiments. Single-pass deposition experiments were conducted by varying the welding current， deposition speed，and bypass feeding speed.The surfaceand cross-sectional morphologyof the single-pass weld were observed，and the optimal parameters during the forming process were determined.Based on this，the feeding speed of the bypassintermediate alloy was set. This new bypassfeding technology provides a new option for the in-situ synthesis of high-strength aluminum alloy additive manufacturing.

Keywords： wire arc additive manufacturing; Al-Cu-Li alloy; process parameters; microstructure; mechanical properties

1序言

铝铜锂合金因其具有较低的密度、高弹性模量、高比强度、高比刚度和较优的疲劳性能等优点[1，2]，所以被广泛应用于现代航空航天大型结构件的生产上，是航空航天工业中发展最迅速的轻质高强结构材料之一[3]。（剩余5313字）