aluminum alloy 2014-O is a copper- aluminum alloy with a copper composition of 4

Question

aluminum alloy 2014-O is a copper- aluminum alloy with a copper composition of 4.5%. determine the phases, and and percentages of each phase , of the alloy T= 550 degrees celsius and T= 0 degrees celsius. assume the material state at T = 0 degrees celsius is approximately the same as the state at T = 300 degrees celsius. use the phase diagram given below. PROBLEM #3 (15 pts) Aluminum alloy 2014-O is a copper-aluminum alloy with a copper composition of 4.5%. Determine the phases, and percentages of each phase, of the alloy at T 550 oC and T 0 oC. Assume the material state at T 0°C is approximately the same as the state at T- 300 oC. Use the phase diagram given below. Composition (at% Cu) 10 700 1200 600 a L L 1000 500 (cuAl2) a 400 300 Composition (wt% Cu) (Al)

Explanation / Answer

At 0oC, since the phase is same as that of 300oC, according to graph no copper exists at that temperature. only pure aluminium exists at that temperate and at solid state. so 100% is solid Al.

At 550oC we get the azeotropic point. at azeotropic point each of the every possible phase exists. here we can have solid Al, then solid Cu, then a mixtture of Al and Cu in solid form, then Al in solid and liquid Cu, then liquid Cu and solid Al and then completely homogenous iquid mixture of both metals. Also the metals react to form Cu(Al)2.

so there are 7 phasespossible in total.

At 550oC four phases can exist i.e homogenous liquid mixture, Al in solid and liq copper, Cu in solid and lig Al and a solid alloy of Cu and Al,hence percentage of each phase is 25%. and remaining phases is zero.

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