Mechanical Properties and Microstructure of Extruded 2198 Al-Li Alloy Bars
Source abstract
Abstract
Al-Li alloy is widely used in aircraft manufacturing due to its high specific strength. The micro-strengthening mechanisms have been investigated widely, including precipitate and solute strengthening. However, the influence of crystallographic texture on mechanical properties remains unclear, because current researches are based on rolled sheet. In this paper, 2198 Al-Li alloy bars were processed using hot extrusion to obtain a texture different from rolling. The mechanical properties were tested via uniaxial tension. The microstructure was observed using scanning electron microscopy, electron backscattered diffraction, and transmission electron microscopy. The results show that the yielding strength and ultimate tensile strength (UTS) of extruded 2198 Al-Li alloy bars are greatly improved due to the precipitation of T1 precipitate after artificial aging. With the increasing of pre-deformation, the number of T1 increases, and the size of T1 precipitate is close to each other, leading to a remarkable increase in strength. When the pre-deformation is 6%, the UTS reaches 611 MPa. 2198 Al-Li alloy bars possess two types of fiber textures: <100> // extrusion direction and <111> // extrusion direction. The presence of <111> fibrous texture with a low Schmid factor can increase the strength of extruded 2198 Al-Li alloy bars. The fracture mechanism of the bar is ductile fracture after artificial aging, while the fracture mechanism is a mix of micropore aggregation and cleavage after natural aging.
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Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Aluminum Alloys Composites Properties · Microstructure and mechanical properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
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