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Which two metal shows the significant strain hardening among Cu, Al, Mg, Zn?

Which two metal shows the significant strain hardening among Cu, Al, Mg, Zn? Correct Answer Cu, Al

Cu, Al=FCC; Mg, Zn=HCP So, with an increase in critical resolved shear stress, the glide shear strain also increases in HCP Material; whereas FCC glide shear strain variation with the cross is very low, which causes strain hardening.

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