Briefly describe the phenomenon of coring (also known as segregation) that occurs during solidification in isomorphous alloys and why it occurs? b) Cite one undesirable consequence of coring?
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- What type of grain structure in terms of chemical composition does non equlibrium cooling produces for isomorphous binary alloys?What kinds of dispersion hardened alloys can retain their strength up to 1000 ° C?List the phase(s) that are present, the phase composition(s) and the weight fractions of the phase(s) for each of the following alloys:(a) 70 wt% Zn-30 wt% Cu at 300 C (b) 90 wt% Pb-10 wt% Sn at 325 C (c) 2.5 kg Cu and 5.0 kg Ag at 900 C (d) 37 lbm Pb and 6.5 lbm Mg at 500 C
- Cite the phases that are present and the phase compositions for the following alloys: 85 wt% Ag–15 wt% Cu at 800°CCite the phases that are present and the phase compositions for the following alloys: 15 wt% Sn–85 wt% Pb at 100°CBriefly describe how precipitation hardening happens in Al alloys (how the microstructure evolves as annealing time increases). Why it first forms q” then q’ before q is finally formed? How does the alloy’s strength change during this process? What are the strengthening mechanisms?
- 1. What temperature does a Fe-C metal with less than 4 weight percent C melt at? 2. What temperature does a Fe-C metal with less than two weight percent C melt at? 3. What climate causes delta-Fe to change into gamma-Fe? 4. What percentage of proeutectoid Fe 3C is present in a steel with 1.15 wt% carbon at 727.1 o C?In the carburization treatment of steels, what are the diffusing species?When alloys A, B, and C are gently cooled from 1000 o C in the following temperature ranges, sketch their microstructures. (equilibrium cooling). List every phase present in the microstructures. Comment on the constituent phases of the resulting alloy and its mechanical characteristics. Please keep it brief.
- 3 Materials Science. From picture below.Describe in detail the phase transformations (showing cooling curves, corresponding optical backgrounds, etc.) that takes place during solidification of the following alloys:(a) 99% Cu - 1% Al(b) 96% Cu - 4% Al(c) 80% Cu - 20% AlIdentify the microstructures of each of expected to be found in each of these alloys 1095 furnace cooled from 1650 farenheight 1095 air cooled from 1650 farenheight 1095 water quenched from 1650 farenheightThe microstructure of eutectic alloys is always heterogeneous.true or false.