Question

Hypothetical phase diagram for A-B system is given below. A and B are both metals and atomic mass of B is much higher than that of A. ㄒ 421°C A 10.2 24.3 i) il in the boxes in the figure with proper phases. The following transformation reaction for the eutectic point for α and β phases is given; 1s3a123+B20.1 at 421°C iii) For an A-B mixture with a wt% of 18 at 420°C (alloy 1) and that with wt% of 18 at 180°C (alloy Il) (both weigh 100 g), compare the following: a) the amount of proeutectic phase b) the amount of overall α phase c) overall density d) the composition of proe utectic phase (the weight% of B in the proeutectic phase) iv) Calculate the amount of A for a 100 g A-B mixture with 18wt% of B at 180°C for the following: a) in α phase b) in B phase

Answer 1

I8oc PD1 d-421 с B she-on maxs D a) Amout- evtecti >ill be same

C. es.xun od, 1 .:. '.. ,.เ,-e .to X100 Amamt od x100 =26。92 ao.1-123 10 0 qmou

っ am B is muek hi mic MA Iven . ウAtomic -) mora amourct v dmait 얼 !8.it.. Bat 420 c. ¡S

om ouwn 2x3-10.2 4448 x 82 g am ouu わ