Three alloys were found to have the hall-petch parameters shown in the following table. alloy σ0 (mpa) ky (mpa mm1/2) a 90 9.2 b 75 6.1 c 170 2.3 which alloy has the highest yield strength for a grain size of 20 microns? which alloy will benefit the most from grain refinement? explain your answer.

fanswer:

explanation:

f

the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only

answer:

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