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Effect of Cu addition and heat treatment on the microstructure and microwear of selective laser melted Mg–Al–Zn alloy

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Abstract

In this study, the microstructure, intermetallic phase, microhardness and wear resistance of unheated and heat-treated Mg-6Al-1Zn-xCu (x = 0, 0.5, 1, 2, and 4) alloys were investigated. The selective laser melted Mg-6Al-1Zn alloy that contained Cu had a typical continuous network structure that consisted of fine α-Mg grains and a eutectic phase. Uniformly distributed Mg2Cu was the main strengthening phase before heat treatment, and the analysis showed that the Mg2Cu was mainly present in the form of particles in the alloy. Most of the eutectic dissolved into the α-Mg matrix, and a granular Al2Cu phase was formed in the matrix after solution treatment. Al2Cu played a significant role in improving the high-temperature properties and wear resistance of the alloy. During the aging treatment, a helical phase (H phase) was formed that was rich in Cu and Al. Compared with those for the other Cu contents, the Mg-6Al-1Zn-2Cu alloy had the best wear resistance and antifriction properties.

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Acknowledgements

This research was funded by the State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology [Grant Number SKLAB02014006]; the Suzhou Science and Technology Bureau [Grant Number SYG201642]; the open fund for Jiangsu Key Laboratory of Advanced Manufacturing Technology [Grant Number HGAMTL-1701]; and the Jiangsu province 333 talent project [Grant Number BRA2017098].

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Advanced Manufacturing Technology, Huaiyin Institute of Technology, Huaian, 223001, China

    Xingcheng Wang, Changjun Chen & Min Zhang

  2. Laser Processing Research Center, School of Mechanical and Electric Engineering, Soochow University, Suzhou, 215131, China

    Xingcheng Wang, Changjun Chen & Min Zhang

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  1. Xingcheng Wang
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  2. Changjun Chen
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  3. Min Zhang
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Contributions

XW: Experiment design, development and paper writing. CC: Theoretical suggestions, language modification. MZ: Experiment idea and suggestions, language modification.

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Correspondence to Changjun Chen.

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Wang, X., Chen, C. & Zhang, M. Effect of Cu addition and heat treatment on the microstructure and microwear of selective laser melted Mg–Al–Zn alloy. Appl. Phys. A 126, 714 (2020). https://doi.org/10.1007/s00339-020-03917-4

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