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Effect of Zr Addition on Microstructure and Properties of Al–Sn–Cu Based Alloy

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Abstract

The microstructure of the Al–0.3Sn–0.3Cu alloy and Al–0.3Sn–0.3Cu–0.15Zr alloy has been examined by X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), the mechanical properties have been evaluated by the tensile strength and microhardness tests. After addition of Zr, fine Al3Zr precipitates provide a core for Sn during the solidification process; at the same time, Sn plays an important role in the distribution of θ(Al2Cu) phase. These reasons lead to demixing of the β(Sn) phase and Al2Cu phase obviously during the extrusion. Under the joint action of Al3Zr and Sn, the Sn–θ(Al2Cu) quasi-binary phase is distributed in the matrix uniformly. The Al3Zr particles hinder the dislocation slip, make the intermediate subboundaries keep a stable state, and enhance the recrystallization resistance. Based on these reasons, the mechanical properties of the Al–0.3Sn–0.3Cu–0.15Zr alloy have been significantly improved.

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FUNDING

The project was supported by the State Key Development Program for Basic Research of China (grant no. 2012CB619504) and program for the 973 Program (nos. 2012CB619504 and 2014CB046702). We are grateful to Professor Y.C. Huang, Dr. Z.B. Xiao, Dr. Y. Liu, and Master Y. Li for their assistance.

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Authors and Affiliations

  1. Research Institute of Light Alloy, Central South University, 410083, Changsha, P.R. China

    Xianwei Ren, Yuanchun Huang & Yu Liu

  2. State Key Laboratory of High Performance and Complex Manufacturing, Central South University, 410083, Changsha, P.R. China

    Xianwei Ren & Yuanchun Huang

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  1. Xianwei Ren
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Correspondence to Yuanchun Huang.

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Xianwei Ren, Huang, Y. & Liu, Y. Effect of Zr Addition on Microstructure and Properties of Al–Sn–Cu Based Alloy. Phys. Metals Metallogr. 120, 694–701 (2019). https://doi.org/10.1134/S0031918X19070093

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  • DOI: https://doi.org/10.1134/S0031918X19070093

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