Friction Stir Back Extrusion (FSBE) is evolving as a novel extrusion process for producing high strength ultrafine-grained tubes from a range of metallic alloys. This investigation focuses on developing a high-fidelity experimental methodology to control the critical process parameters of the FSBE process for manufacturing high strength ZE41 magnesium alloy tubes. The crucial parameters of FSBE required to manufacture highly reliable ZE41 tubes were determined with solid evidence obtained through a wide range of thorough experimental trials on ZE41 magnesium round rods. The metallurgical characterisation was performed at key regions across the tubes obtained using the ideal process conditions to understand the influence of FSBE process parameters on the microstructural formation. Mechanical properties of the tubes were evaluated and found that the tubes produced at optimum conditions have achieved high tensile and hoop strengths. The microstructure-mechanical property correlation confirmed that the FSBE process driven with the controlled process parameters enable to produce defect-free high strength ZE41 magnesium tubes with a significant enhancement in grain refinement.

摩擦搅拌反挤压 (FSBE) 正在发展成为一种新型挤压工艺，用于从一系列金属合金生产高强度超细晶粒管。本研究的重点是开发一种高保真实验方法，以控制用于制造高强度 ZE41 镁合金管的 FSBE 工艺的关键工艺参数。制造高度可靠的 ZE41 管所需的 FSBE 的关键参数是通过对 ZE41 镁圆棒进行广泛彻底的实验试验获得的确凿证据确定的。在使用理想工艺条件获得的管子上的关键区域进行冶金表征，以了解 FSBE 工艺参数对微观结构形成的影响。对管子的机械性能进行了评估，发现在最佳条件下生产的管子具有很高的拉伸强度和环向强度。微观结构-机械性能相关性证实，以受控工艺参数驱动的 FSBE 工艺能够生产出无缺陷的高强度 ZE41 镁管，晶粒细化显着增强。