Microstructure evolution and properties of in situ synthesized TiB 2 -reinforced aluminum alloy by laser surface alloyin
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ARTICLE Microstructure evolution and properties of in situ synthesized TiB2-reinforced aluminum alloy by laser surface alloying Tingting Zhang Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; and Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China
Zhuguo Lia) Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China; and Shanghai Innovation Institute for Materials, Shanghai 200444, China
Kai Feng and Hiroyuki Kokawa Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Yixiong Wu Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; and Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China (Received 13 August 2018; accepted 9 October 2018)
In the present work, the TiB2-reinforced AA6061 composites were successfully in situ synthesized by laser surface alloying using a mixture of Ti and AlB2 powders. The microstructure evolution and properties of the composites were systematically studied. The results showed that TiB2 particles displayed a homogeneous distribution in the aluminum matrix with controllable contents and morphologies. By adjusting the molar ratio of alloying powders, phase constitution of the composites was varied. Thermodynamic calculation was used to analyze the phase selection during the solidification. It was found that the morphology of TiB2 particles was converted from hexagonal plate into rod-like structure with an increase of Ti contents. Transmission electron microscopy results illustrated that the in situ synthesized TiB2 particles exhibited a well-bonded interface with the Al matrix. Properties characterization revealed a significant enhancement in microhardness and abrasion resistance compared with the aluminum substrate attributed to the presence of the TiB2 reinforcements. The strengthening and wear mechanism were also discussed.
I. INTRODUCTION
Aluminum alloys are extensively used in automobile and aerospace industries, where a combination of lightweight and good formability is required.1–3 Unfortunately, due to the low hardness and poor abrasive resistance, the properties of aluminum alloys are insufficient to fulfill the increased requirements and the application is therefore limited.4,5 In recent years, ceramic-particles-reinforced metal matrix composites (MMCs) have received widespread attention because they exhibit good mechanical properties su
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