In a laboratory creep experiment at 1273K, a steady-state creep rate of 5 ××10-1 %, per hour is obtained in a metal alloy. The creep mechanism for this alloy is known to be dislocation climb with an activation energy of 200 kJ>mol. Predict the service temperature in (°C) for a creep rate of 8.68 ×10-5 %, per hour. (Assume that the laboratory experiment duplicated the service stress.)

It has been found that 'pyrex' cookware made of borosilicate glass does not shatter during baking or cooking around 300°F. However, shattering of cookware made of soda-lime-silicate glass was frequently reported during the years 2012-2013. Find and explain the possible reasons for cookware shattering. Show your calculation. Assume that the cookwares are free of pores, cracks, and scratches. Given: Material/properties Borosilicate Soda-lime-silicate glass glass Thermal expansion coefficient (x106/°C) Elastic modulus (GPa) Failure stress (MPa) 3 9. 62 68 30 30

One.