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Effect of Al9Fe0.7Ni1.3 Phase on the Microstructure and Mechanical Properties of Al-Zn-Mg-Cu-Ni Alloys Prepared by Spray Deposition
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College of Materials Science and Engineering,Inner Mongolia University of Technology

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the National Natural Science Foundation of China, Ph.D. Programs Foundation of the Ministry of Education of China,

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    Abstract:

    In this study, an Al-Zn-Mg-Cu alloy with Ni added as alloying element was synthesized via spray deposition. The element was present in the alloy in the form of spherical submicrometer Al9Fe0.7Ni1.3 compound particles. The effects of the particles on the microstructure and mechanical properties of the alloy after a solution treatment were investigated by scanning electron microscopy (SEM) in conjunction with electron backscatter diffraction (EBSD), transmission electron microscopy (TEM) and tensile tests. We found that the Al9Fe0.7Ni1.3 compound particles were mainly present near the grain boundaries, revealing a powerful recrystallization inhibition effect during the solution treatment. After the solid solution treatment, the alloy exhibited an ultimate tensile strength of 603 MPa and an elongation at break of 11.79%, and transgranular ductile fracture was identified as the main fracture mechanism. The results show that the presence of the spherical submicrometer Al9Fe0.7Ni1.3 compound particles played a key role on the mechanical properties of the alloy, leading to grain refinement strengthening and Orowan strengthening, and was the main reason for the occurrence of transgranular ductile fracture.

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[Fei Liu, Pucun Bai, Xiaohu Hou, Xiaoming Cui, Ruixing Guo. Effect of Al9Fe0.7Ni1.3 Phase on the Microstructure and Mechanical Properties of Al-Zn-Mg-Cu-Ni Alloys Prepared by Spray Deposition[J]. Rare Metal Materials and Engineering,2019,48(2):440~445.]
DOI:10.12442/j. issn.1002-185X.20170660

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History
  • Received:July 26,2017
  • Revised:September 06,2017
  • Adopted:September 11,2017
  • Online: March 15,2019
  • Published: