Scholarlink

<p>Conventional laser directed energy deposition (LDED) of aluminum alloy is challenged by anisotropy of microstructure and mechanical properties, as well as low deposition efficiency. This study attempted to mitigate these deficiencies by designing and realizing the deposition of gradient samples via a self-designed test platform that combined multi-wire deposition and oscillating laser technologies. The microstructure and mechanical properties of the Al-Cu-Si gradient wall (GW) and Al-Cu homogeneous block (HB) were explored in two deposition directions, studying the heat treatment effects on the HB microstructure and mechanical properties. The experimental results proved that the deposition direction did not significantly affect the microstructure and properties of aluminum alloy samples deposited by multi-wire laser. The GW cross-section had a lower-arched layered structure, and the microstructure comprised equiaxed and columnar crystals. With the increased Si content, the porosity, grain size, and hardness decreased. The deposited HB mainly comprised equiaxed crystals, accompanied by many reticular precipitates, with an average hardness of 80 HV and tensile strengths of 218, 217, and 215&#xa0;MPa in X, Y, and Z directions, respectively. The deposition efficiency was improved, while the mechanical properties showed no anisotropy. After T6 solid solution treatment + aging, the precipitated phase was dissolved, the Cu element was uniformly distributed, the hardness grew to 150 HV, and the tensile strength exceeded 420&#xa0;MPa. High isotropy of mechanical properties in the deposited and heat-treated states proved an effective mitigation of the anisotropy problem faced by conventional LDED.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mechanical properties and microstructures of circular oscillating laser directed energy deposition of Al-Cu alloy with multi-wire

  • 期刊论文

  • 发表日期：

    2025年11月18日

查看全文
  • Changle Li,
  • Zhitao Ping,
  • Bowen Zheng,
  • Junfeng Qi,
  • Shikai Wu

摘要

Conventional laser directed energy deposition (LDED) of aluminum alloy is challenged by anisotropy of microstructure and mechanical properties, as well as low deposition efficiency. This study attempted to mitigate these deficiencies by designing and realizing the deposition of gradient samples via a self-designed test platform that combined multi-wire deposition and oscillating laser technologies. The microstructure and mechanical properties of the Al-Cu-Si gradient wall (GW) and Al-Cu homogeneous block (HB) were explored in two deposition directions, studying the heat treatment effects on the HB microstructure and mechanical properties. The experimental results proved that the deposition direction did not significantly affect the microstructure and properties of aluminum alloy samples deposited by multi-wire laser. The GW cross-section had a lower-arched layered structure, and the microstructure comprised equiaxed and columnar crystals. With the increased Si content, the porosity, grain size, and hardness decreased. The deposited HB mainly comprised equiaxed crystals, accompanied by many reticular precipitates, with an average hardness of 80 HV and tensile strengths of 218, 217, and 215 MPa in X, Y, and Z directions, respectively. The deposition efficiency was improved, while the mechanical properties showed no anisotropy. After T6 solid solution treatment + aging, the precipitated phase was dissolved, the Cu element was uniformly distributed, the hardness grew to 150 HV, and the tensile strength exceeded 420 MPa. High isotropy of mechanical properties in the deposited and heat-treated states proved an effective mitigation of the anisotropy problem faced by conventional LDED.