多道次摩擦搅拌处理和镁添加对Al 1050合金的微观结构和拉伸性能的影响

研究了多道次搅拌摩擦加工 (FSP) 和镁粉添加对 Al 1050 合金不同微观结构部分的影响，包括搅拌区 (SZ)、热影响区 (HAZ) 和热机械影响区 (TMAZ)等。对微观结构分析结果表明，随着 FSP 道次的增加，非复合样品和复合样品中 SZ 的晶粒尺寸减小，而非复合样品中 TMAZ 和 HAZ 的晶粒尺寸增加。此外，镁粉的加入导致了大程度的晶粒细化，增加 FSP 道次的数量导致原位复合样品中 Al–Mg 金属间化合物的分布更均匀。拉伸试验结果表明，与母材和复合材料样品相比，经过四道 FSP 的非复合材料样品表现出更高的伸长率和韧性断裂。然而，与母材和非复合样品相比，该样品表现出脆性断裂和更高的拉伸强度。与经过 FSP 的母材和非复合材料样品相比，复合材料样品的制造显着提高了硬度。

Effects of multipass friction stir processing and Mg addition on the microstructure and tensile properties of Al 1050 alloys

The effects of multipass friction stir processing (FSP) and Mg powder addition on the different microstructure parts, including the stir zone (SZ), heat-affected zone (HAZ), and thermomechanically affected zone (TMAZ) of Al 1050 alloy were investigated. Microstructural observations revealed that with the increase in the number of FSP passes, the grain size of the SZ decreased in the non-composite and composite samples, whereas that of the TMAZ and HAZ increased in the non-composite sample. Furthermore, the addition of Mg powder resulted in considerable grain refinement, and increasing the number of the FSP passes resulted in a more uniform distribution of Al–Mg intermetallic compounds in the in-situ composite sample. Results of the tensile test showed that the non-composite sample that underwent four passes of FSP exhibited a higher elongation percentage and a ductile fracture in comparison with those of the base metal and the composite sample. However, this sample exhibited a brittle fracture and a higher tensile strength in comparison with the base metal and the non-composite sample. The fabrication of composite samples resulted in a remarkable enhancement in hardness in comparison with the base metal and the non-composite samples that underwent FSP.