Work Softening of Aluminum Base Alloys Containing Nanoscale Icosahedral Phase

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  • Work Softening of Aluminum Base Alloys

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Melt-spun Al93Mn5Ce2, Al92Mn6Ce2 and Al94.5Cr3Ce1Co1.5 ribbons consist of nanoscale icosahedral (I) particles surrounded by fcc-Al phase without grain boundaries. The ribbons were cold rolled to 70% reduction in thickness (Re) and the rolling causes significant decreases in hardness and tensile strength. The particle size and interparticle spacing of the I-phase decrease by rolling, accompanying the increase in the area of the I/Al interface. However, no dislocation was observed in the cold-rolled Al and I phases. The absence of dislocations is because the interface acts as a sink of dislocations, leading to the work-softening. The softening phenomenon reflects an inverse Hall-Petch relation in which the yield strength and hardness decrease with decreasing grain size in the size region below about 30 nm because the interparticle spacing of the I-phase decreases from 15–25 nm to 5–10 nm by cold rolling to 30 to 70% reduction in thickness. This phenomenon is important for better understanding of deformation and strengthening mechanisms of the nanostructure alloys.

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