For extruded bars of the magnesium alloy AZ61A, the Metals Handbook (ASM, v. 1, 8th ed. p. 1106) reports the tensile yield strength as 35,000 psi and the compressive yield strength as 19,000 psi. Deduce how the c axis must be oriented relative to the rod axis in these extrusions, assuming the difference is due to the directionality of twinning.

 

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