Given a Cu-Ag alloy with a bulk composition of 30wt% Ag, answer the following: a. At what temperature does the first solid start to form? units: units: units: b. What is the elemental composition of this solid phase when it first appears? c. At what temperature does the material become fully solid? d. What is the elemental composition of the very last portion of liquid that is present just before the system fully transforms to solid? Temperature (°C) 1200 1000 800 A α B 8.0 (CE) units: Composition (at% Ag) 20 40 60 80 100 2200 -Liquidus Liquid 2000 -Solidus a +L 1800 F 1600 779°C (TE) B+L E G 71.9 91.2 1400 β (CE) (CBE) 600 Solvus α + β 400 C 200 0 20 40 (Cu) 1200 1000 800 600 H 400 60 80 100 (Ag) Composition (wt% Ag) Temperature (°F)

34 If the following diagram represents the sintering of the ceramic MgO, what could the curves x and y refer to? increase in property X 1000 1200 1600 sintering temperature (°C) (A) = grain size; y porosity (B) x grain size; y = strength O(C) x porosity; y-grain size 1400 O (D) x strength; y grain size 1800

1. A 65 wt% Ni -35 wt% Cu alloy is heated to a temperature within the a + liquid phase region. If the composition of the a phase is 70 wt % Ni, determine i. The temperature of the alloy ii. The composition of the liquid phase iii. The mass fraction of both phases Composition (at% Ni) 20 40 60 80 100 1600 H 2800 1500 Liquid 1453°C 2600 1400 Solidus line Liquidus line 2400 1300 a +L 1200 2200 1100 A 2000 1085°C 1000 20 40 60 80 100 (Cu) Composition (wt% Ni) (Ni) Temperature (°C) Temperature (F)

View Policies Current Attempt in Progress Using the Animated Figure 10.40, the isothermal transformation diagram for a 0.45 wt% C steel alloy, specify the nature of the final microstructure (in terms of the microconstituents present) of a small specimen that has been subjected to the following temperature treatments. In each case assume that the specimen begins at 845 °C and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. a) Rapidly cool to 700 degrees C, hold for 100,000 s, then quench to room temperature. b) Rapidly cool to 450 degrees C, hold for 10 s, then quench to room temperature. proeutectoid ferrite + pearlite proeutectoid ferrite + martensite proeutectoid ferrite + pearlite + martensite eT proeutectoid ferrite + pearlite + bainite + martensite all spheroidite Save all bainite Attempts: 0 of 5 used Submit Answer all martensite bainite + martensite