Herein, heterostructured (HS) Zr/Ti materials with layered or layered?gradient microstructure are reported. The effects of the microstructure on the mechanical properties of HS Zr/Ti are studied. Layered Zr/Ti materials show additional strengthening based on the rule of mixture, which may be caused by the heterodeformation?induced hardening. The attempt is to provide a method to fabricate bulk heterostructured materials.Composite metals are promising materials displaying better properties than the sum of their counterpart. Herein, layered and layered gradient (heterogeneous) Zr/Ti materials are fabricated via rolling bonding and annealing. For comparison, Zr/Zr, Ti/Ti, and homogeneous Zr?Ti alloys are also fabricated. The microstructures are characterized using scanning electron microscopy and electron backscatter diffraction. Tensions, compressions and microhardness tests are performed to evaluate the mechanical properties of Zr/Ti materials. Layered Zr/Ti composite is composed of alternated Zr layer/interface layer/Ti layer, and chemical composition is gradient distributed in the interface layer. Layered gradient Zr/Ti alloy is composed of multi interface layers, showing periodic composition gradient. It is found that the strengths of the layered and layered gradient Zr/Ti materials decreased with the increase of layer thickness. The yield strength of the layered Zr/Ti composite is higher than the strength calculated with the rule of mixture (ROM), indicating extra strengthening. However, the yield strength of the layered gradient Zr/Ti alloy is lower than the calculated strength based on ROM. The effects of the layered and layered structures on the mechanical property of Zr/Ti materials are discussed. This study may provide a method to fabricate bulk heterostructured materials with gradient chemical composition.

» Author: Jiateng Ma, Yang Zhou, Weijun He, Bin Jiang, Qing Liu

» Publication Date: 21/03/2022

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