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(a) for a fe-0.4 wt% c alloy at 900 and 600c: (i) plot the constitution points on the phase diagram. (ii) identify the phases present, and find their compositions in wt%. (iii) if the temperature is slowly reduced from 900 to 600c, at what temperatures are phase boundaries crossed? identify the phases present after each boundary is crossed. (b) how does slow cooling from 900 to 600c differ for a fe-0.8 wt% c alloy?

Sagot :

Alloy metals can exist in different phases. Phases are physically homogeneous states of an alloy. A phase has a precise chemical composition – a certain arrangement and bonding between the atoms.

This structure of atoms imparts different properties to different phases. We can choose the phase we want and use it in our applications. Only some special alloys can exist in multiple phases. Heating the metal to specific temperatures using heat treatment procedures results in different phases. Some special alloys can exist in more than one phase at the same temperature.

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