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- 저자 : ZiBo Tang (검색결과 1 건)
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ZiBo Tang,Wei Xiong,Jin Zhang,Ying Zheng,Cheng Huang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.7
Stiffened cylindric components made by traditional block-welding processes are severely limited by their poor mechanicalproperties. Here, we present a novel spin-extrusion forming (SEF) process for manufacturing 2195 Al–Li alloy weld-freestiffened components. The grain configuration of 2195 Al–Li alloy was first tuned by different annealing temperaturesand subsequently modified by SEF and T8 treatments. The evolution of microstructure and mechanical properties of thestiffened cylindric component is studied in detail. The results show that the initial grain structure with large proportion ofrecrystallized grains are transformed into fine equiaxed grains after SEF, and the hardness is increased. After T8 treatment,the sample with higher proportion of deformed grains have the highest peak-aging hardness and the shortest peak-aging timedue to grain boundary strengthening. However, T1phases are enriched at the grain boundaries after T8 treatment, resultingin precipitation-free zones and thus lowering the strength and elongation of the samples. In clear contrast, the samples consistlargely of recrystallized grains achieves the highest tensile strength (602.1 MPa) and elongation (7%), simultaneouslyimproving the strength and ductility of the spin-extruded 2195 stiffened cylindric component.
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