# Recent questions in Materials science

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# For the following process, draw the materials flow diagram, write the independent reactions, do the degree of freedom analysis and complete the materials and energy balances

5000 kg/hr of iron pyrite is roasted in 30% excess air to obtain Fe2O3 and SO2. Calculate the flame temperature of the flue gases.4FeS + 11O2 = 2Fe2O3 + 8SO2
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# A hypothetical A–B alloy of composition 55 wt% B–45 wt% A at some temperature is found to consist of mass fractions of 0.5 for both α and β phases. If the composition of the β phase is 90 wt% B–10 wt% A, the composition of the α phase in wt% of B is

A hypothetical A–B alloy of composition 55 wt% B–45 wt% A at some temperature is found to consist of mass fractions of 0.5 for both α and β phases. If the composition of the β phase is 90 wt% B–10 wt% A, the composition of the α phase in wt% of B is _________
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over 4 years ago

# Why are we given in the university common subjects that have nothing to do with the major ?

Why are we given in the university common subjects that have nothing to do with the major even though you may have determined your major since the foundation year and this material will not be useful to you ??
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# Hollomon’s equation , Determine n

(1) A polycrystalline metal has a plastic stress--strain curve that obeys Hollomon’s equation,σ = K ε nDetermine n, knowing that the flow stresses of this material at 2% and 10% plastic deformation (offset) are equal to 175 and 185 MPa, respectively.(2) You are traveling in an airplane. The engineer who designed it is, casually, on your side. He tells you that the wings were designed using the von Mises criterion. Would you feel safer if he had told you that the Tresca criterionhad been used? Why?
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# gold. operate a Frank--Read source, compute the dislocation density

Consider dislocations blocked in gold. If the flow stress is controlled by the stress necessary to operate a Frank--Read source, compute the dislocation density ρ in the crystal when it is deformed to a point where the resolvedshear stress on the slip plane is 45 MPa. Take the shear modulus G = 27 GPa.
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