*Article* **Microstructure and Wear of W-Particle-Reinforced Al Alloys Prepared by Laser Melt Injection**

**Zhidong Xu, Dengzhi Wang \*, Wenji Song, Congwen Tang, Pengfei Sun, Jiaxing Yang, Qianwu Hu and Xiaoyan Zeng**

> Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China; m202073063@hust.edu.cn (Z.X.); wjsong@hust.edu.cn (W.S.); m201972902@hust.edu.cn (C.T.); d202181055@hust.edu.cn (P.S.); m202073085@hust.edu.cn (J.Y.); huqw@hust.edu.cn (Q.H.); xyzeng@hust.edu.cn (X.Z.)

**\*** Correspondence: dzwang@hust.edu.cn; Tel.: +86-189-711-93217

**Abstract:** W-particle-reinforced Al alloys were prepared on a 7075 aluminum alloy surface via laser melt injection to improve their wear resistance, and the microstructure, microhardness, and wear resistance of the W/Al layers were studied. Scanning electron microscopy (SEM) results confirmed that a W/Al laser melting layer of about 1.5 mm thickness contained W particles, and Al4W was formed on the surface of the Al alloys. Due to the reinforcement of the W particles and good bonding of the W and Al matrix, the melting layer showed excellent wear resistance compared to that of Al alloys.

**Keywords:** laser melting injection; W particles; Al alloys; wear
