One metal sample is hot worked 40%; a second sample is hot worked 50%; a third sample is cold worked 40%; a fourth sample is cold worked 50%.  Select all of the following that are true.   Group of answer choices The 40% hot worked sample would have the highest tensile modulus. The two cold worked samples would have the highest tensile modulus and the cold worked moduli are equal. The 50% cold worked sample would have the highest tensile modulus. The 50% hot worked sample would have the highest tensile modulus. The 40% cold worked sample would have the highest tensile modulus. The two hot worked samples would have the highest tensile modulus and the hot worked moduli are equal. The tensile modulus of all the samples would be about the same.

One metal sample is hot worked 40%; a second sample is hot worked 50%; a third sample is cold worked 40%; a fourth sample is cold worked 50%.  Select all of the following that are true.   Group of answer choices The 50% cold worked sample would have the highest yield strength. The two hot worked samples would have the highest yield strength and the hot worked yields are equal. The yield strength of all the samples would be about the same. The 40% hot worked sample would have the highest yield strength. The two cold worked samples would have the highest yield strength and the cold worked yields are equal. The 50% hot worked sample would have the highest yield strength. The 40% cold worked sample would have the highest yield strength.

The engineering stress-strain curve below was obtained for a precipitation hardened Aluminum alloy. What is the approximate Yield Strength for this alloy in psi? Engineering Stress Based on Original Area (psi) 50,000 45,000 40,000 35,000 30,000 25,000 20,000 15,000 10,000 5,000 0 O 0.02 0.04 0.06 Aluminum 6061-T6 0.08 0.1 0.12 Engineering Strain (in/in) 0.14 X 0.16 0.18