TRUE OR FALSE Phase diagram gives us important information on melting. crystalli
ID: 515960 • Letter: T
Question
TRUE OR FALSE Phase diagram gives us important information on melting. crystallization. and casting. _Metal parts subjected to repetitive stresses will fail due to fatigue loading at a much lower stress than that which the material can withstand under the application of a single static stress _The factors that cause a metal to experience a brittle to ductile transition are exposure to stresses at relatively low temperatures, high strain rate and the presence of a sharp notch _Brittle fracture is also knows as cup and cone fracture. _Fracture Toughness decreases as the temperature increases. _Crazing is a very localized plastic deformation in thermoplastic polymers. _Creep is a form of failure that occurs in structures subjected to dynamic and fluctuating stress. _In polycrystalline materials the crystal with largest T_R yields first and other crystals yield later _As cold work is increased yield strength decreases and increases.Explanation / Answer
a. True
Phase diagram shows the pressure and temperature conditions at which thermodynamically distinct phases occur at equillibrium.
b.true
weakening of material occurs if it is subjected to repetitive loads, hence fatigue occurs.
c. false
ductile materials tend to become brittle at lower temperatures
d.false
ductile fractures are known as cup and cone fractures because it is a slant fracture which originates from tiny internal fractures called as microvoids.
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