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Effect of Thin TaN on Tensile Characteristics of Tantalum

机译：稀TaN对钽拉伸性能的影响

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The purpose of this study is to reveal the effect of surface nitriding on the tensile characteristics and fracture morphology of tantalum. In this study, two types of gas nitride treatment, with different surface hardness, were introduced to cold rolling tantalum. A constant tensile speed was given in the specimen until fracture. In order to investigate the nominal strain and surface strain distribution, an image measurement system was used. Hardness distribution in across the thickness of the specimen and surface morphology of fractured specimens were also evaluated. Test results showed that the fracture state of the nitride specimens could be divided into 3 stages. At the first stage, in the elastic region, due to the presence of a TaN layer, the Young’s modulus of the specimen increased as compared to that of pure tantalum. At the second stage in the strain hardening region, the tiny crack of the TaN layer was propagated due to the increase in strain. Therefore, pseudo-strain hardening would be observed because of the progressive propagation of surface cracks. At the final stage, the surface crack propagated across the width, and thus, the deformation was concentrated.
机译：这项研究的目的是揭示表面氮化对钽的拉伸特性和断裂形态的影响。在这项研究中，将两种具有不同表面硬度的氮化物气体处理方法引入到冷轧钽中。在试样中给出恒定的拉伸速度直至断裂。为了研究名义应变和表面应变分布，使用了图像测量系统。还评估了整个试样厚度的硬度分布和断裂试样的表面形态。测试结果表明，氮化物试样的断裂状态可以分为三个阶段。在第一阶段，在弹性区域，由于存在TaN层，与纯钽相比，样品的杨氏模量增加了。在应变硬化区域的第二阶段，由于应变的增加，TaN层的细小裂纹扩展了。因此，由于表面裂纹的逐步传播，将观察到伪应变硬化。在最后阶段，表面裂纹扩展到整个宽度，因此变形集中。

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