Synthesis and Properties of Bulk Nanostructured Metallic Materials

Ahn, Byungmin

doi:10.3390/met8100855

Cited by 3 publications

(1 citation statement)

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“…UFG materials are structurally identified by a large volume fraction of grain boundaries, which significantly affect their physical and mechanical characteristics such that mechanical strength of metals can be substantially improved by this grain size refinement into the sub-micrometer range [13] [14]. Particularly, UFG aluminum alloys are seeing as a lightweight substitute to the conventional heavy materials used in the automotive and the aerospace industries [15].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Quasi-Static Mechanical Behavior of Cryoforged AA2519 Alloy

Azimi¹,

Owolabi²,

Fallahdoost³

et al. 2019

MSA

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In this study, AA2519 alloy was initially processed by multi axial forging (MAF) at room and cryogenic temperatures. Subsequently, the microstructure and the mechanical behavior of the processed samples under quasi-static loading were investigated to determine the influence of cryogenic forging on alloys' subgrains dimensions, grain boundaries interactions, strength, ductility and toughness. In addition, the failure mechanisms at the tensile rupture surfaces were characterized using scanning electron microscope (SEM). The results show significant improvements in the strength, ductility and toughness of the alloy as a result of the cryogenic MAF process. The formation of nanoscale crystallite microstructure, heavily deformed grains with high density of grain boundaries and second phase breakage to finer particles were characterized as the main reasons for the increase in the mechanical properties of the cryogenic forged samples. The cryogenic processing of the alloy resulted in the formation of an ultrafine grained material with tensile strength and toughness that are ~41% and ~80% higher respectively after 2 cycles MAF when compared with the materials processed at ambient temperature. The fractography analysis on the tested materials shows a substantial ductility improvement in the cryoforged (CF) samples when compared to the room temperature forged (RTF) samples which is in alignment with their stress-strain profiles. However, extended forging at higher cycles than 2 cycles led only to increase in strength at the expense of ductility for both the CF and RTF samples.

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Section: Introductionmentioning

confidence: 99%