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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Ultrafine-grained and Heterostructured Materials (UFGH XI)
Presentation Title Size Dependent Strengthening in High Strength Nanotwinned Al/Ti Multilayers
Author(s) Yifan Zhang, Sichuang Xue, Qiang Li, Jin Li, Jie Ding, Tongjun Niu, Ruizhe Su, Haiyan Wang, Xinghang Zhang
On-Site Speaker (Planned) Yifan Zhang
Abstract Scope Here we report the study of magnetron-sputtered highly textured Al/Ti multilayers with various layer thicknesses (h = 1 - 90 nm). The hardness of Al/Ti multilayers increases monotonically with decreasing layer thickness without softening and exceeds 7 GPa, making it one of the strongest light-weight multilayer systems reported to date. High resolution transmission electron microscopy (TEM) and X-ray diffraction pole figure analyses confirm the formation of high-density nanotwins and 9R phase in Al layers. The density of nanotwins and stacking faults scales inversely with individual layer thickness. In addition, there is an HCP-to-FCC phase transformation of Ti when h ≤ 4.5 nm. And the post-indentation TEM analysis reveals deformation induced phase transformation in Ti layer. The high strength of Al/Ti multilayers primarily originates from incoherent interface, high-density twin boundaries, as well as stacking faults. Our findings have general implication for the design of high-strength and light-weight heterogeneous nanocomposite materials.
Proceedings Inclusion? Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume

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