Enhanced ductility of B4C/Al composites by controlling thickness of interfacial oxide layer through high temperature oxidation of B4C particles

Jiang, Longtao; Xue, Wei; Kang, Pengchao; Chao, Zhenlong; Han, Hwataik; Zhang, Runwei; Du, Shanqi; Han, Binzhuo; Zhao, Qingliang; Wu, Guanglei

doi:10.1016/j.jallcom.2022.168486

Cited by 7 publications

(1 citation statement)

References 38 publications

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“…Unfortunately, the limited strength and wear resistance restrict their applications. To overcome this dilemma, numerous Al matrix composites (AMCs) reinforced with various ceramic particles such as Al 2 O 3 , SiC, TiB 2 , B 4 C, and TiC [ 4 , 5 , 6 ] have been developed due to their high wear resistance, high specific modulus, and low thermal expansion [ 7 , 8 ]. Over the past decades, researchers have been trying to improve the homogeneous distribution of reinforcements in AMCs to create high-performance particle-reinforced AMCs.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior of Nacre-Inspired (TiBw-TiB2)/Al Composites Fabricated by Freeze Casting

Zhang,

Qian,

Yang

et al. 2024

Materials

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Nacre-inspired metal matrix composites have received much attention due to their excellent deformation coordination ability, which can achieve the synergy of strength and ductility. The preparation of nacre-like Al matrix composites by freeze casting has been a promising application, but the continuous ceramic-rich layer affects the corrosion resistance of the composites, facing complex corrosion problems during service. In this work, the microstructure and corrosion behavior of the nacre-inspired (TiBw-TiB2)/Al composites fabricated by freeze casting and squeeze casting were systematically studied. The results indicated that the Al layers and ceramic-rich layers had little change, about 35 μm and 31 μm, respectively, with an increasing ratio of the Ti/TiB2. Meanwhile, a high Ti/TiB2 ratio resulted in an increase in the Fe-Ti intermetallic phases, which was detrimental to the corrosion performance of the composites and was prone to pitting. The electrochemical test results showed that the 3Ti7TiB2 composite had the lowest corrosion current density (15.9 μA) and intergranular corrosion depth (231 μm), indicating that it had the best corrosion resistance, which can be attributable to its stable and dense passivation film. Two different corrosion phenomena during the intergranular corrosion test existed in the present nacre-inspired (TiBw-TiB2)/Al composites: intergranular corrosion in the Al matrix layer and pitting corrosion in the ceramic-rich layer. Among all the composites, the corrosion depth of the 3Ti7TiB2 composite was the smallest and significantly less than that of the 2024Al alloy. In addition, the continuous ceramic-rich layer acted as a corrosion channel during corrosion, significantly degrading the corrosion resistance of the nacre-like Al composites.

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