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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Correlation of dynamic impact properties with adiabatic shear banding behaviour in Ti-15Mo-5Zr-3Al alloy
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Correlation of dynamic impact properties with adiabatic shear banding behaviour in Ti-15Mo-5Zr-3Al alloy

机译：Ti-15Mo-5Zr-3Al合金动态冲击性能与绝热剪切带行为的相关性

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摘要

A compressive split-Hopkinson pressure bar is used to investigate the impact properties of Ti-15Mo-5Zr-3Al alloy under strain rates ranging from 800 to 8000 s~(-1) at temperatures between 25 and 900 ℃. The morphologies of the deformed microstructures and the fracture features of the adiabatic shear bands on the fracture surfaces are examined using optical and scanning electron microscopes. Based on the macroscopic and microscopic observations, the dynamic impact properties of the alloy are correlated with its adiabatic shear banding behaviour. The experimental results indicate that the strain rate and testing temperature both have a significant effect on the mechanical properties of Ti-15Mo-5Zr-3Al alloy. At a constant temperature, the flow stress increases with increasing strain rate. However, at a given strain rate, the flow stress reduces as the temperature increases. Furthermore, the fracture strain decreases with increasing temperature prior to phase transformation at 785 ℃, but increases thereafter as the temperature is further increased. The temperature-dependent variation of the fracture strain is thought to be related to the amount of a phase in the deformed microstructure, which increases with increasing temperature prior to phase transformation, but dissolves entirely at higher temperatures and is replaced by a pure β phase. Fractographic analysis reveals that the specimens fracture as a consequence of adiabatic shear band formation. Specimens impacted at higher strain rates and lower temperatures are more likely to form adiabatic shear bands. The width of the shear band decreases with increasing temperature prior to phase transformation, but increases with increasing temperature thereafter. The microhardness within the adiabatic shear band is found to increase slightly in the specimens tested at higher strain rates and temperatures. The fracture surfaces of the impacted specimens exhibit both dimple-like and cleavage-like features. Finally, the splats and knobble-like features observed on the fracture surfaces of specimens deformed at the highest strain rate of 8 × 10~3 s~(-1) and temperatures of 300 ℃ or higher, indicate that significant melting takes place during deformation under high strain rate and high temperature loading conditions prior to specimen fracture.
机译：利用压裂霍普金森压力棒研究了Ti-15Mo-5Zr-3Al合金在25至900℃之间的应变速率为800至8000 s〜（-1）时的冲击性能。使用光学和扫描电子显微镜检查变形显微组织的形貌和断面上绝热剪切带的断裂特征。基于宏观和微观观察，该合金的动态冲击性能与其绝热剪切带行为有关。实验结果表明，应变速率和测试温度均对Ti-15Mo-5Zr-3Al合金的力学性能有重要影响。在恒定温度下，流动应力随着应变率的增加而增加。但是，在给定的应变率下，流动应力随着温度的升高而降低。此外，在785℃相变之前，断裂应变随着温度的升高而减小，但随着温度的进一步升高，断裂应变随之增加。断裂应变的温度相关变化被认为与变形的微结构中的相量有关，相变在相变之前随温度的升高而增加，但在更高的温度下完全溶解并被纯β相替代。分形分析表明，样品由于绝热剪切带的形成而破裂。在较高的应变速率和较低的温度下受到冲击的试样更可能形成绝热剪切带。剪切带的宽度在相变之前随温度升高而减小，但在其后随温度升高而增大。在较高的应变速率和温度下测试的样品中，发现绝热剪切带内的显微硬度略有增加。受到冲击的试样的断裂表面既表现出凹痕状特征又表现出分裂状特征。最后，在8×10〜3 s〜（-1）的最高应变速率和300℃或更高的温度下变形的试样断裂面上观察到的裂片和棘突状特征表明变形期间发生了明显的熔化在高应变率和高温载荷条件下断裂之前。

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