Abstract Non-melting tube-to-tube joining techniques between copper and steel are of significance for the development of monoblock type divertor components for future DEMO. In this study, tube-to-tube joining between T91 and ODS-Cu (reference materials), which is difficult to accomplish by traditional fusion welding, has been successfully realized with a rotary friction welding manner. The junctions are free of defects such as microcracks. Asymmetric diffusion of elements has been observed. Very narrow soft regions were found in ODS-Cu at the vicinity of the interfaces in all specimens. All the specimens have appreciable tensile strengths (290 to 330 MPa) but exhibit brittle characteristics. Both two as-received specimens were not broken after the scheduled rotary bending fatigue testing. Relationships among tensile properties (brittleness), microhardness (narrow soft region) and microstructures (asymmetric diffusion) have been tried to establish.

中文翻译：

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ODS-Cu/T91 管与管旋转摩擦焊连接的实现

摘要 铜与钢之间的非熔化管对管连接技术对于未来DEMO的整体式偏滤器组件的开发具有重要意义。在这项研究中，T91 和 ODS-Cu（参考材料）之间的管对管连接是通过旋转摩擦焊接方式成功实现的，这是传统熔焊难以实现的。连接处没有缺陷，例如微裂纹。已经观察到元素的不对称扩散。在所有样品的界面附近的 ODS-Cu 中发现了非常窄的软区域。所有样品都具有可观的拉伸强度（290 至 330 MPa），但表现出脆性。在预定的旋转弯曲疲劳测试后，两个原样都没有断裂。拉伸性能（脆性）之间的关系，