Question

Problem 10.19 x Incorrect. A magnesium-lead alloy of mass 9.7 kg consists of a solid a phase that has a composition just slightly below the solubility limit at 300°C (570°F). The magnesium-lead phase diagram is shown in Animated Figure 10.20. (a) What mass of lead is in the alloy? 41.649 1.649 | kg (b) If the alloy is heated to 400°C (750°F), how much more lead may be dissolved in the a phase without exceeding the solubility limit of this phase? 12.1382 kg Click if you would like to Show Work for this question: Open Show Work

A magnesium-lead alloy of mass 9.7 kg consists of a solid α phase that has a composition just slightly below the solubility limit at 300°C (570°F). The magnesium-lead phase diagram is shown in Animated Figure 10.20.

(a) What mass of lead is in the alloy?

kg

(b) If the alloy is heated to 400°C (750°F), how much more lead may be dissolved in the α phase without exceeding the solubility limit of this phase?

wt%Pb = (m_Pb + m_add / m_alloy + m_add) , m_add = ?

kg

Answer 1

Answer: (9) This portion of the probler asks that we calculate for a Pb-mg alloy the mass of lead in a rig of the solid. a phare at 300°c Just below the solubilly limit froi sigure 10.20 The Carposition of an alloy at this turprature in about. 17 low. pb. Therefore the mass of pb in the alley is sust 0 17x9.2 kg = 1.649. mass of lead = 1.7kg / At 400°c the solworking limit of the a prese increasses. to approximately 32%. pb . in order to dermine the additional amount of pb that may be added (mob), we utilize a modified from of Equanar as 1.7 + mpo a 100 9.7 +mpo' 1.7 + m = 327. 0.32 = 1.7 + 2 9.7 + x 0.32 (9.772) = 1.7+2 3.1 +0.32n = 1.7+ se 3.11-1.7 = re-0322 1.4- 0.682 2= 2.06 Impor 2.06 kg

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