Microstructure and Tensile Property of Al3Zr/Al-Cu-Ni-V Composite Prepared by In Situ Reaction

Junge Cui, Guangkai Zeng, Nikhil Gupta, Yue Luo, Xiangzhou Fu, Hailong Yang, Anmin Li, Liwen Pan

Research output: Contribution to journalArticlepeer-review


In this work, the high-temperature stable D023-Al3Zr was introduced to an Al-Cu-Ni-V alloy to improve the HT (350 °C) mechanical properties by the melt in situ reaction. The effect of Al3Zr contents and T6 heat treatment on the microstructure, room temperature, and high-temperature tensile properties of the Al3Zr/Al-6Cu-2Ni-0.5 V composites was investigated. The α-Al, Al2Cu, Al3Ni, Al3CuNi, Al7Cu4Ni, and Al3Zr phases were present in the as-cast composites. The amount of the fine (2-4 μm) blocky D023-Al3Zr increases with the increased addition of K2ZrF6 salt. After T6 heat treatment, the dispersed fine θ′-Al2Cu precipitates (200-300 nm) formed in the matrix. The interconnected structure of the Al3CuNi phase was broken, became spherical and coarsened. In addition, the Al3Zr particles had higher Cu content and changed from blocky to elliptical or spherical shapes without changing the tetragonal crystal structure after the T6 treatment. The highest HT tensile strength was observed for the as-cast composite containing 12 wt.%Al3Zr, reaching 118 MPa, 35.48% higher than the base alloy. After the T6 treatment, the tensile strength of 9 wt.%Al3Zr/Al-6Cu-2Ni-0.5 V composite at room and the elevated temperature reached 288.5 and 143.1 MPa, respectively. The analysis shows that the addition of K2ZrF6 not only introduced the high thermal stability D023-Al3Zr, but also promoted the precipitation and refinement of the θ′-Al2Cu after aging. The improvement of high-temperature mechanical properties of the composites is mainly attributed to the precipitation strengthening of the D023-Al3Zr phase and the dispersion strengthening by the θ′-Al2Cu phase that indirectly modifies by K2ZrF6.

Original languageEnglish (US)
JournalJournal of Materials Engineering and Performance
StateAccepted/In press - 2023


  • Al-Cu-Ni-V alloy
  • heat treatment
  • high-temperature property
  • microstructure

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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