1 Plastic Deformation Occurs Through Dislocation Motion... ...so in order to make a material stronger, we should prevent dislocations from moving. For each of the following alloys, identify the strengthening mechanism and explain how it impedes dislocation motion: A. An aluminum alloy "inoculated" with TiB2 during solidification, producing a large number of small grains. B. Monel, a corrosion-resistant solid solution of Ni and Cu. C. An aluminum-lithium aerospace alloy containing precipitates of AlzLi. D. Wrought iron, which is often worked into complex shapes such as railings or furniture.

Question-6. For solidification of a piece of FCC-metal at 860 °C. The melting point of the metal is 1260 °C. The latent heat of fusion and surface free energy are -2.16 x108 J/m³ and 0.126 J/m², respectively. If nucleation is homogeneous, answer the following questions: (a) Compute the critical radius r* in nm (b) Compute the activation free energy AG* in J (c) If the lattice parameter is 0.26 nm at the melting temperature, compute the number of atoms found in a nucleus of critical size (d) Compute the critical radius at the supercooling degree of 260 K.

Cite the phases that are present and the phase compositions for the following alloys: 15 wt% Sn–85 wt% Pb at 100°C

Sketch following modes of dislocation motion and name conditions that help them occur: 1. Cross slip 2. Climb up & climb down

do not provide wrong solution

What process will result in Ferrite plus Pearlite microstructure? List the reasons why this structure will have low strength.

Select barriers to the motion of dislocations: Other dislocations Precipitates Grain boundaries between the same or different phases Strains in crystal lattices Interstitial and substitutional alloying elements

Identify 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 farenheight

Calculate the approximate total dislocation line length(or range of lengths) expected in a cubic cm of a very highlycold-worked metal.

room temperature plastic deformation of pure lead (pb), with recrystallization temperature of -4, will enhance its: a. tensile strength b. modulus of elasticity c.ductility d. none of the above   please explain