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Deformation Twinning in Pure Nickel Induced by a High-Current Pulsed Electron Beam

机译:大电流脉冲电子束诱导纯镍中的形变孪晶

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摘要

Recent experimental evidence has shown that face-centered-cubic materials that are not normally associated with deformation twinning will twin during moderate high-current pulsed electron beam (HCPEB) processing. In this paper, we present an experimental investigation of deformation twinning in pure multi-crystalline nickel exposed to HCPEB irradiation from a Nadezhda-2 HCPEB device. The samples, which were irradiated with various numbers of pulses, were examined. The formation of a large number of twin lamellae on the treated surface was observed in the regions without surface melting. Moreover, a large strain located at the twin lamellae deformation was found. Transmission electron microscope analysis revealed that the deformation twinning was indeed triggered during the HCPEB irradiation. This suggests that the very high stresses and superfast strain rates induced via the rapid heating and cooling caused by the HCPEB irradiation lead to deformation twinning in coarse-grained nickel.
机译:最近的实验证据表明,通常不与形变孪晶相关的面心立方材料在中等强度的大电流脉冲电子束(HCPEB)加工过程中会孪生。在本文中,我们对Nadezhda-2 HCPEB装置暴露于HCPEB辐射的纯多晶镍中的形变孪晶进行了实验研究。检查了用各种脉冲数照射的样品。在没有表面熔化的区域中观察到在处理过的表面上形成了大量的孪晶薄片。此外,发现在双晶层形变处有较大的应变。透射电子显微镜分析表明,在HCPEB辐照期间确实触发了变形孪生。这表明,由HCPEB辐射引起的快速加热和冷却所引起的极高应力和超快应变速率会导致粗晶镍的变形孪生。

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