Hot isostatic pressing of in-situ TiB/Ti-6Al-4V composites with novel reinforcement architecture, enhanced hardness and elevated tribological properties

JOURNAL OF ALLOYS AND COMPOUNDS

卷:710

Article

Cai, Chao¹  Song, Bo¹  Qiu, Chunlei²  Li, Lifan¹  Xue, Pengju¹  Wei, Qingsong¹  Zhou, Jianxin¹  Nan, Hai³  Chen, Hongxia⁴  Shi, Yusheng¹ 

[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Mould Technol, Wuhan 430074, Peoples R China

[2] Cardiff Univ, Sch Engn, Cardiff CF24 3AA, S Glam, Wales

[3] Aviat Ind China, Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China

[4] Beijing Univ Sci & Technol, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

关键词: Hot isostatic pressing;    Titanium matrix composites;    Microstructure;    Microhardness;    Wear properties;   

DOI  :  10.1016/j.jallcom.2017.03.160

来源: Elsevier

【 摘 要 】

In this study, titanium borides reinforced Ti-6Al-4V composites have been successfully prepared by hot isostatic pressing (HIPing). The microstructure of the as-fabricated samples was investigated using X-ray diffraction technique, secondary electron microscopy and electron backscatter diffraction and the mechanical properties evaluated through micro-hardness and wear resistance measurements together with nano-indentation. It was found that during HIPing the additive particles TiB2 have transformed into TiB needles which tend to decorate at prior particle boundaries of the consolidated powder particles to form a network structure. Under the same HIPing condition, the needles became increasingly coarser and agglomerated with increased addition of TiB2. The micro-hardness of the synthesized materials increased with increased volume fraction of TiB. Nano-indentation measurement demonstrates that the TiB network structure shows much higher nanohardness than the surrounding matrix regions. The friction coefficient of the synthesized composites decreased continuously with increased volume fraction of TiB, indicating improved wear resistance. High resolution transmission electron microscopy analysis on wear debris revealed the formation of a series of oxides suggesting that chemical reaction between alloy elements and oxygen in air may have happened. It is thus believed that the wearing of the current samples is a result of both friction and chemical reaction. (C) 2017 Elsevier B.V. All rights reserved.

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