Scholarlink

<p>AZ61 magnesium alloy, valued in automotive and aerospace sectors for its low density, high strength-to-weight ratio, and machinability, faces welding challenges such as porosity, cracking, and brittle intermetallic phase formation. This study examines the microstructural evolution, mechanical performance, and fracture behavior of AZ61 joints produced by continuous-wave fiber laser welding at 1.6&#xa0;kW and 20&#xa0;mm/s. Results show fine equiaxed dendritic grains in the fusion zone and coarse β-Mg₁₇Al₁₂ precipitates near the fusion boundary, enhancing hardness but reducing ductility. Welds exhibited a sharp drop in ultimate tensile strength (149&#xa0;MPa to 39.4&#xa0;MPa) and elongation, with fractures initiating in β-rich regions. Microhardness peaked at ~ 49 Hv in the weld center but decreased to ~ 39 Hv in the heat-affected zone. While laser welding offers precision, speed, and low distortion, limitations in ductility retention remain, highlighting the need for parameter optimization, hybrid processes, and post-weld treatments. Findings guide the use of AZ61 laser welds in lightweight structural and aerospace applications where strength is critical but moderate ductility is acceptable.</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 and Microstructural Behavior of Laser-Welded AZ61 Magnesium Alloy

  • 期刊论文

  • 发表日期：

    2026年5月3日

查看全文
  • Lochan Sharma,
  • Amman Jakhar,
  • Abhishek Kumar,
  • Kanika Sharma

摘要

AZ61 magnesium alloy, valued in automotive and aerospace sectors for its low density, high strength-to-weight ratio, and machinability, faces welding challenges such as porosity, cracking, and brittle intermetallic phase formation. This study examines the microstructural evolution, mechanical performance, and fracture behavior of AZ61 joints produced by continuous-wave fiber laser welding at 1.6 kW and 20 mm/s. Results show fine equiaxed dendritic grains in the fusion zone and coarse β-Mg₁₇Al₁₂ precipitates near the fusion boundary, enhancing hardness but reducing ductility. Welds exhibited a sharp drop in ultimate tensile strength (149 MPa to 39.4 MPa) and elongation, with fractures initiating in β-rich regions. Microhardness peaked at ~ 49 Hv in the weld center but decreased to ~ 39 Hv in the heat-affected zone. While laser welding offers precision, speed, and low distortion, limitations in ductility retention remain, highlighting the need for parameter optimization, hybrid processes, and post-weld treatments. Findings guide the use of AZ61 laser welds in lightweight structural and aerospace applications where strength is critical but moderate ductility is acceptable.