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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Grain Size on the Tensile Deformation Mechanisms of Commercial Pure Titanium as Revealed by Acoustic Emission
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Effect of Grain Size on the Tensile Deformation Mechanisms of Commercial Pure Titanium as Revealed by Acoustic Emission

机译：声发射显示晶粒尺寸对商业纯钛拉伸变形机制的影响

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摘要

The effect of grain size on the deformation mechanisms during different tensile stages in commercial pure titanium was investigated by acoustic emission (AE) at room temperature. The deformation mechanisms, dislocation slip, and mechanical twinning were found to be the two AE sources for all grain sizes throughout the experiments. Based on the AE features of frequency and energy, the AE signals stemming from the two deformation mechanisms were classified. As grain size increased, the AE activity and intensity attributed to twinning increased. The twinning activity was confirmed by optical microscope and scanning electron microscopy. The results showed that for the specimen with small-sized grains, the entire tensile deformation was mainly achieved by slip, and only slightly assisted by twinning. Deformation of the specimen with medium-sized grains was accomplished by combined slip and twinning. For the specimen with large grains, twinning was the more active mechanism during the early stages of the tensile tests, while slip played a larger role in the later stages of the tensile tests. This larger role of slip in the later stages occurred despite the notable increase in the amount of twinning.
机译：通过室温下的声发射（AE）研究了晶粒尺寸对商品纯钛不同拉伸阶段变形机制的影响。在整个实验过程中，发现变形机理，位错滑移和机械孪晶是所有晶粒尺寸的两个AE源。根据频率和能量的AE特征，对源自两种变形机制的AE信号进行分类。随着晶粒尺寸的增加，归因于孪晶的AE活性和强度增加。通过光学显微镜和扫描电子显微镜确认孪晶活性。结果表明，对于具有小晶粒的试样，整个拉伸变形主要通过滑移实现，而仅通过孪生稍微辅助。通过结合滑移和孪晶来完成具有中等晶粒度的试样的变形。对于具有大晶粒的试样，孪晶在拉伸试验的早期阶段是更活跃的机制，而滑移在拉伸试验的后期阶段起更大的作用。尽管孪晶数量显着增加，但在后期的滑动中起了更大的作用。

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