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liquid magnesium is poured into a 2 cm times 2 cm times 24 cm mold and as a result of directional solidification all of
design an efficient risering system for the casting shown in figure 9-26 be sure to include a sketch of the system
1 write down the gibbs phase rule assuming temperature and pressure are allowed to change explain clearly the meaning
1 define the terms brazing and soldering2 what is the difference between fusion welding brazing and soldering3 what is
a liquid cast iron has a density of 765 gcm3 immediately after solidification the density of the solid cast iron is
1 what is a riser why should it be designed so as to freeze after the casting2 calculate the volume diameter and height
1 calculate the volume diameter and height of the cylindrical riser required to prevent shrinkage in a 4 in times 10 in
a cooling curve is shown in figure 9-22 determinea the pouring temperatureb the solidification temperaturec the
1 how can solid solutions form in ceramic systems2 do we need 100 solid solubility to form a solid solution of one
1 how many grams of nickel must be added to 500 grams of copper to produce an alloy that has a liquidus temperature of
suppose 1 at of the following elements is added to copper forming a separate alloy with each element without exceeding
a fiber-reinforced composite material is produced in which tungsten fibers are embedded in a nb matrix the composite is
1 what is brass explain which element strengthens the matrix for this alloy2 what is the composition of monel alloy3
1 briefly state the hume-rothery rules and explain the rationale2 based on hume-rotherys conditions which of the
1 what are the origins of chemical segregation in cast products2 how can microsegregation be removed3 what is
question 1 consider the combustion of methane which can be written as the following chemical reactionch4g 2o2gnbsprarr
1 what is spray atomization2 homogenization of a slowly cooled cu-ni alloy having a secondary dendrite arm spacing sdas
1 what are the requirements of a matrix and precipitate for dispersion strengthening to be effective2 what is an
1 what are some of the major problems in the utilization of intermetallics for high-temperature applications2 define
a hypothetical phase diagram is shown in figure 11-25a are there any intermetallic compounds present if so identify
the cu-zn phase diagram is shown in figure 11-26a are any intermetallic compounds present if so identify them and
the al-li phase diagram is shown in figure 11-27a are any intermetallic compounds present if so identify them and
calculate the total beta and the eutectic microconstituent at room temperature for the following lead-tin alloys 10
consider an al-25 si alloy see figure 11-19 determinea if the alloy is hypoeutectic or hypereutecticb the composition
1 a pb-sn alloy contains 23 primary a and 77 eutectic microconstituent determine the composition of the alloy2 an al-si