Surface modification and twinning behavior in gradient graphene-based TiC/Ti6Al4V composite
Surface modification and twinning behavior in gradient graphene-based TiC/Ti6Al4V composite
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DOI：
10.1016/j.apsusc.2022.152495
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发表时间：
2022-01
影响因子：
6.7
通讯作者：
Yingchen Wang;Daixiu Wei;Liqiang Wang;Ling Zhang;Jia Liu;Yujin Tang;Yuan-fei Fu;W. Lu
中科院分区：
文献类型：
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作者：
Yingchen Wang;Daixiu Wei;Liqiang Wang;Ling Zhang;Jia Liu;Yujin Tang;Yuan-fei Fu;W. Lu
梯度材料具有打破强塑性折衷的巨大潜力。石墨烯对钛合金具有很强的亲和性，在材料改性方面具有重要的应用价值。本文研究了石墨烯基TiC/Ti6 Al 4V复合材料在搅拌摩擦加工过程中的组织演变和变形行为。电子背散射衍射（EBSD）显示，在搅拌区（SZ）均匀的微观结构。透射电子显微镜（TEM）观察揭示了不同深度的加工表面不同的微观结构。SZ包括纳米/微米颗粒和TiC纳米片。在α基体和TiC中均存在孪晶结构。应力诱发马氏体相变被抑制。随着深度的增加，TiC逐渐消失，FSP诱导的{-2116}< 2-1-11 >织构略有增强。此外，还存在特殊的晶体取向关系：（111）TiC//（0001）Ti。在基底金属（BM）中，观察到较大的晶粒，并且位错结构成为主要的缺陷特征。纳米压痕结果表明，从加工表面到本体金属，硬度先降低后升高。硬度分布是TiC孪晶强化效应和α孪晶变形适应效应共同作用的结果。
Gradient materials have significant potential to break strong plastic tradeoffs. Graphene with a strong affinity for titanium alloys has an influential application value for material modification. In this study, microstructure evolution and deformation behavior of graphene-based TiC/Ti6Al4V composites processed by friction stir processing (FSP) have been investigated. Electron backscattered diffraction (EBSD) reveals uniform microstructure in the stir zone (SZ). Transmission electron microscopy (TEM) observations reveal distinct microstructures at different depths from the processed surface. The SZ includes nano/micro grains and TiC nanoplates. Twin structure exists in both α matrix and TiC. Stress-induced martensitic transformation is suppressed. As depth increases, TiC gradually disappears and the FSP-induced texture {-2116} < 2–1–11 > becomes slightly stronger. Moreover, there exists special crystallographic orientation relation: (1 1 1)TiC//(0001)Ti. In the base metal (BM), larger grains are observed, and dislocation structure becomes the dominant defect feature. Nanoindentation results show that hardness decreases first and then increases from the processed surface to the bulk metal. The distribution of hardness is the result of combined action of strengthening effect of TiC twins and deformation adaptation effect of α twins.