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Materials, Vol. 11, Pages 914: Influence of Homogenization on Microstructural Response and Mechanical Property of Al-Cu-Mn Alloy

Materials, Vol. 11, Pages 914: Influence of Homogenization on Microstructural Response and Mechanical Property of Al-Cu-Mn Alloy

Materials doi: 10.3390/ma11060914

Authors: Jian Wang Yalin Lu Dongshuai Zhou Lingyan Sun Renxing Li Wenting Xu

The evolution of the microstructures and properties of large direct chill (DC)-cast Al-Cu-Mn alloy ingots during homogenization was investigated. The results revealed that the Al-Cu-Mn alloy ingots had severe microsegregation and the main secondary phase was Al2Cu, with minimal Al7Cu2Fe phase. Numerous primary eutectic phases existed in the grain boundary and the main elements were segregated at the interfaces along the interdendritic region. The grain boundaries became discontinuous, residual phases were effectively dissolved into the matrix, and the segregation degree of all elements was reduced dramatically during homogenization. In addition, the homogenized alloys exhibited improved microstructures with finer grain size, higher number density of dislocation networks, higher density of uniformly distributed θ′ or θ phase (Al2Cu), and higher volume fraction of high-angle grain boundaries compared to the nonhomogenized samples. After the optimal homogenization scheme treated at 535 °C for 10 h, the tensile strength and elongation% were about 24 MPa, 20.5 MPa, and 1.3% higher than those of the specimen without homogenization treatment.

Authors:   Wang, Jian ; Lu, Yalin ; Zhou, Dongshuai ; Sun, Lingyan ; Li, Renxing ; Xu, Wenting
Journal:   Materials
Volume:   11
edition:   6
Year:   2018
Pages:   914
DOI:   10.3390/ma11060914
Publication date:   29-May-2018
Facts, background information, dossiers
  • tensile strength
  • samples
  • MPA
  • microstructures
  • Matrix
  • interfaces
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