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<p>In order to further improve the engineering application of aluminum alloy manned sealed cabin structure, this paper mainly studies the influence of the hot spinning process on the microstructure and mechanical properties of 70-mm-thick 5B70 alloy hot-rolled plate. The microstructure analysis shows that the hot-rolled alloy matrix is mainly composed of deformed microstructure (77 and 79%) and substructure. After hot spinning, due to the influence of plastic deformation and heat input, sufficient dynamic recovery occurs in the matrix, and the proportion of substructure is significantly increased (about 81%). The grain size in the A region of the alloy decreases, and the grain size in the B region does not change significantly. In addition, the dynamic recovery during hot rolling and hot spinning reduces the dislocation density of the alloy, so that the mechanical properties of different parts of the spinning parts are evenly distributed, that is, the tensile strength of the material along the bus direction and the circumferential direction is less than 10%. And the lower dislocation density of the alloy after hot spinning reduces its yield strength (241 and 240&#xa0;MPa ), but severe plastic deformation can effectively eliminate material defects, thus still maintaining high tensile strength (393 and 390&#xa0;MPa).</p>

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Effect of Hot Spinning Process on the Microstructure and Mechanical Properties of Large-Thickness 5B70 Aluminum-Magnesium-Scandium Alloy Plates

  • 期刊论文

  • 发表日期：

    2026年5月26日

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  • Xiaoyu Shen,
  • Xiaoming Lai,
  • Huicheng Geng,
  • Jingyu Jiang,
  • Zhuoxun Yi,
  • Bo Wang,
  • Liguo Gao,
  • Liming Hu,
  • Jianan Yang,
  • Feng Jiang,
  • Feifei Wu

摘要

In order to further improve the engineering application of aluminum alloy manned sealed cabin structure, this paper mainly studies the influence of the hot spinning process on the microstructure and mechanical properties of 70-mm-thick 5B70 alloy hot-rolled plate. The microstructure analysis shows that the hot-rolled alloy matrix is mainly composed of deformed microstructure (77 and 79%) and substructure. After hot spinning, due to the influence of plastic deformation and heat input, sufficient dynamic recovery occurs in the matrix, and the proportion of substructure is significantly increased (about 81%). The grain size in the A region of the alloy decreases, and the grain size in the B region does not change significantly. In addition, the dynamic recovery during hot rolling and hot spinning reduces the dislocation density of the alloy, so that the mechanical properties of different parts of the spinning parts are evenly distributed, that is, the tensile strength of the material along the bus direction and the circumferential direction is less than 10%. And the lower dislocation density of the alloy after hot spinning reduces its yield strength (241 and 240 MPa ), but severe plastic deformation can effectively eliminate material defects, thus still maintaining high tensile strength (393 and 390 MPa).