3313Q2Sp02 - 3 ENSC 3313 Spring 2002 Answer any 4 Questions...

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ENSC 3313, Spring 2002 Quiz 2 Name Answer any 4 Questions only, 1 point each Identify the six 2-fold symmetry axes in a hexagonal crystal. There are 6 side faces and 6 side edges. Join the midpoints of the opposite faces and edges (- the 6 pair up). One exanlple of each is depicted. 2. How many lattice points/atoms per mm are there in the <110> direction of the FCC metal, aluminum, a = 0.04049 nm? This direction is the face diagonal. We have 2 lattice points/atoms in the distance .J2 a, 0.0573 nm. mm = 10-3 m nm = 10-9 m Hence, have 2 x 106 =34.9xlO6 0.0573 Draw the plane {013) and the direction [331 3 in a cubic unit cell. a) For planes, we use reciQrocals, hence the intercepts on the axes are 00, -1, -1/3. With origin at 0, the plane is as sketched. b) For direction, dividing by 3 to keep in 1 cell, we go from top rear left origin, 1, 1, - (1/3) -as shown. Note the direction lies in the plane. Thence, "hv+kv+fw
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3313Q2Sp02 - 3 ENSC 3313 Spring 2002 Answer any 4 Questions...

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