Lu, XiaochenXiaochenLuYu, JunquanJunquanYuYardley, VictoriaVictoriaYardleyWu, ZZWuLiu, HHLiuShi, ZhushengZhushengShiLin, JianguoJianguoLin2023-01-232023-01-232022-12-19IOP Conference Series: Materials Science and Engineering, 2022, 1270, pp.1-71757-8981http://hdl.handle.net/10044/1/101344Differential velocity sideways extrusion (DVSE) is a novel process for fabricating curved profiles; welding quality during extrusion is an important issue for its industrial application. In this study, solid bars of aluminium alloy AA1070 were extruded from multiple billets at 500 °C using the novel process and the microstructure and mechanical properties of the extrudate were investigated. The weld formed between the billets includes longitudinal and transverse solid-state weld regions formed as the metal was extruded. The longitudinal welds have better mechanical properties than the transverse welds. Dynamic recrystallisation (DRX) occurred in areas with high dislocation density during the extrusion process and as a result, grains across the bonding interfaces of longitudinal welds have been formed, which improves the weld quality. In the areas with the transverse welds, macro weld defects can be observed at the weld front. With further progress of sideways extrusion, the defect density reduced and new grains formed at the bonding surface.© 2022 The Author(s). Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.Conference Paperhttps://www.dx.doi.org/10.1088/1757-899X/1270/1/012091