In solidification it is quite common for materials showing faceting to solidify as two crystals in twin orientations.

In solidification it is quite common for materials showing faceting to

1.	In solidification it is quite common for materials showing faceting to solidify as two crystals in twin orientations.
A.	False
B.	True
Answer» C.

Discussion

No Comment Found

Related MCQs

The maximum velocity at the tip of growing dendrite occurs when ______ (r* is the critical radius)
Calculate the value of latent heat of fusion per unit volume if the thermal conductivities of solid and liquid are given as 15 and 20 kW/mK respectively and the temperature gradient of liquid and solid are given as 2K/m and 1.5K/m respectively? (Assume the rate of growth as 5m/s)
When the solidification takes place from the mould wall (cooler than melt), this leads to the heat conduction through the solids. However the heat flow into the liquid arises if a certain condition is satisfied. Which among the following corresponds to the same?
Let s take the tip of a growing dendrite. Here in this case it can be seen that the tip velocity tends to zero for a particular value of r known as______
Let us now take a closer look at the tip of a growing dendrite. The situation is different from that of a planar interface because heat can be conducted away from the tip in three dimensions. As a result of the Gibbs-Thomson effect equilibrium across a curved interface occurs at an undercooling Tr below Tm given by______ (Latent heat of fusion per unit volume)
In pure metals solidification is controlled by the rate at which the latent heat of solidification can be conducted away from the solid/liquid interface. Which among the following equation satisfies the heat flow and the interface stability? (Kl, Ks are respective thermal conductivities of liquids and solids, L the latent heat of fusion per unit volume, v growth rate).
In solidification it is quite common for materials showing faceting to solidify as two crystals in twin orientations.
If the solid contains dislocations that intersect the S/L interface the problem of creating new interfacial steps can be circumvented. A complete theoretical treatment of this situation shows that for spiral growth the normal growth rate v and the undercooling of the interface Ti are related by an expression given as_______ (K material constant)
Calculate the extent of interfacial undercooling if the value of k (Mobility) is given as 0.05(m/ (sec*Kelvin)) and the rate of solidification(R) is given as 5m/sec?
Calculate the interfacial undercooling if the melting temperature is 600K and the latent heat of melting is given as 30kJ/kg? (Assume the driving force for solidification as 45kJ/kg?

In solidification it is quite common for materials showing faceting to solidify as two crystals in twin orientations.

Discussion

No Comment Found

Related MCQs

Reply to Comment