True/False: Water and ice have the same chemical formula, so they are the same p

Question

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 A cylindrical metal specimen having an original diameter of 10 mm and gauge length of 40 mm is pulled in tension until fracture occurs. The diameter at the point of fracture is 7 mm, and the fractured gauge length is 60 mm. Calculate the ductility in terms of percent reduction in area; the ductility in terms of percent elongation. Consider a metal single crystal oriented such that the normal to the slip plane and the slip direction are at angles of 50 degree and 40 degree, respectively, with the tensile axis. If the critical resolved shear stress is 5 MPa, will an applied stress of 12 MPa cause the single crystal to yield? If not what stress will be necessary?

Explanation / Answer

7) False. Same chemical formula means same components not phases.

8) True, hardness directly depends on tensile strength of the material

9) True, recovery is the first stage of annealing- cold working

10) False. True stresses are always greater than the engineering stresses

11) True, small imputies are always tend to concentrations at dislocations

Pls post remaining questions separately.

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