Assignment3 - [100 a[110 a[111 and a[211 direction(d The...

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1 Assignment #3 ME264 Materials Science for Mechanical Engineering Spring 2009 Due Date: 4 March 2009 (5 pts) 1. (1pt) (a) Calculate the density of an f.c.c. packing of spheres of unit density. (b) If these same spheres are packed to form a glassy structure, the arrangement is called “dense random packing” and has a density of 0.636. If crystalline f.c.c. nickel has a density of 8.90 Mg m -3 , calculate the density of glassy nickel. 2. (2pts) (a) Sketch three-dimensional view of the unit cell of b.c.c. crystal, showing a (100) plane, a (110) plane, a (111) plane and a (210) plane. (b) The slip planes of b.c.c. iron are the {110} planes: sketch the atom arrangement in these planes, and mark the <111> slip directions. (c) Sketch three-dimensional views of the unit cell of an f.c.c. crystal, showing a
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Unformatted text preview: [100], a [110], a [111] and a [211] direction. (d) The slip planes of f.c.c. copper are the {111} planes: sketch the atom arrangement in these planes and mark the <110> slip directions. 3. (2pts) (a) The atomic diameter of an atom of nickel is 0.2492 nm. Calculate the lattice constant a of f.c.c. nickel. (b) The atomic weight of nickel is 58.71 kg kmol-1 . Calculate the density of nickel. (Calculate first the mass per atom, and the number of atoms in a unit cell.) (c) The atomic diameter of an atom of iron is 0.2482 nm. Calculate the lattice constant a of b.c.c. iron. (d) The atomic weight of iron is 55.85 kg kmol-1 . Calculate the density of iron....
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