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.

中文翻译：

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层状和层状梯度Zr/Ti材料的组织和力学性能研究

复合金属是有前途的材料，其性能优于其对应物的总和。在此，层状和层状梯度（异质）Zr/Ti 材料是通过滚动结合和退火制造的。为了比较，还制造了 Zr/Zr、Ti/Ti 和均质 Zr-Ti 合金。使用扫描电子显微镜和电子背散射衍射表征微观结构。进行拉伸、压缩和显微硬度测试以评估 Zr/Ti 材料的机械性能。层状Zr/Ti复合材料由交替的Zr层/界面层/Ti层组成，界面层化学成分呈梯度分布。层状梯度Zr/Ti合金由多个界面层组成，呈现周期性成分梯度。发现层状和层状梯度Zr/Ti材料的强度随着层厚的增加而降低。层状 Zr/Ti 复合材料的屈服强度高于使用混合规则 (ROM) 计算的强度，表明额外强化。然而，层状梯度 Zr/Ti 合金的屈服强度低于基于 ROM 计算的强度。讨论了层状和层状结构对Zr/Ti材料力学性能的影响。该研究可能提供一种制造具有梯度化学成分的块状异质结构材料的方法。层状梯度 Zr/Ti 合金的屈服强度低于基于 ROM 的计算强度。讨论了层状和层状结构对Zr/Ti材料力学性能的影响。该研究可能提供一种制造具有梯度化学成分的块状异质结构材料的方法。层状梯度 Zr/Ti 合金的屈服强度低于基于 ROM 的计算强度。讨论了层状和层状结构对Zr/Ti材料力学性能的影响。该研究可能提供一种制造具有梯度化学成分的块状异质结构材料的方法。