Which one of the following statements is true? Explain your answer. a] When copp

Question

Which one of the following statements is true? Explain your answer.
a] When copper is stresses to just below its ultimate tensile strength, all the deformation is plastic.
b] The critical resolved shear stress of copper is increased by the additional of small amounts of nickel.
c] Necking only occurs in metals that are subjected to a stress strain test in which true stress plotted against true strain.
d] The hardenability expontent of some steels is equal to .15
e] If material A has a higher stiffness than material B, materiel A must also have a higher proportional limit than material B.

Explanation / Answer

Add nickel to copper, strength goes up, ductility goes down - for the same

b] The critical resolved shear stress of copper is increased by the additional of small amounts of nickel.

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