Question 1 1 pts Considering the solidification of an alloy from a melt, the supercooling values necessary for homogeneous nucleation are smaller than those for heterogeneous nucleation. True O False Question 2 2 pts Assume we are cooling down our alloy from a melt. A transformation from liquid to solid at large undercooling values will yield a fine-grained microstructure, while a transformation from liquid to solid at small undercooling values will yield a coarse-grained microstructure. Question 3 1 pts If a particular nucleus/cluster of atoms is not greater than the critical radius, it can still continue to grow. True O False Question 4 1 pts With increasing supercooling values, the critical radius necessary for a nucleus/baby crystal to grow: o increases is unchanged O decreases D Question 5 1 pts At a particular supercooling value, the critical radius associated with homogeneous nucleation is the critical radius associated with heterogeneous nucleation. O the same as O larger than smaller than D Question 6 1 pts If we cool an alloy down from a melt very quickly to low temperatures, we can prevent it from reaching an equilibrium microstructure. O True O False D Question 7 1 pts The rate of phase transformation is defined as: O the inverse of the time necessary to reach 50% transformation O the time necessary to reach 100% transformation the time necessary to reach 50% transformation O the inverse of the time necessary to reach 100% transformation D Question 8 1 pts As the radius of a nucleus/baby crystal increases in size, the magnitude of the volume free energy grows at a faster rate than the magnitude of the surface free energy. O True O False