TrueFalse Water and ice have the same chemical formula so th

True/False: Water and ice have the same chemical formula, so they are the same phase. True/False: Hardness is proportional to tensile strength. True/False: Recovery is the first stage in the in the removal of the effects of cold working when a cold-worked metal is slowly heated. True/False: True stress is always smaller than the engineering stress. True/False: Impurities tend to concentrate at dislocations. Short answer: A solid phase transforms into two other solid phases upon cooling, and the reverse reaction occurs upon heating. It is called a __ reaction. Short answer: The temperature at which recrystallization reaches completion in is called recrystallization temperature. Short answer: As cold work is increased, ductility _, tensile strength, yield strength _.

Solution

7. False

8.true

9.true

10.false

True stress is lower for uniaxial stresses in compression and greater for uniaxial stresses in tension. Poisson\'s ratio effects means that in the compression case the material expands laterally, increasing the area over which the applied force acts, while in the tensile case the material contracts laterally so decreasing the area. For a general, multi-axial stress case, one can\'t say whether the true stress is greater than the engineering stress or not, one must evaluate whether the lateral strain is expansive or contractile

11.true

12.eutectoid reaction

13.1 hour

14.ductility decreased , tensile strength increased , yeild strength increased