quiz3fall01 - ENSC 3313, Fall 2001 .nswer I. any 4...

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ENSC 3313, Fall 2001 Quiz 3 .nswer any 4 Questions only, 1 point each I. The micrograph below shows the crystal grains in a metal at ~. Please determine the ASTM grain size number . The magnification is 200, so I will see only a quarter of those I would see in 1 " x 1" at 1 OOx , so either I can draw my 1" x 1 " unit and multiply by 4 or draw a 2" x 2" unit, as here. I count ~ 128 N 2n-l 7 = = 128 = 2 and n -8 2. If 1 lattice site in 10,000 of a particular metal is vacant at 1000°K and 1 lattice site in 100,000 is vacant at 900°K, what proportion of lattice sites are vacant at 600°K? Recollect that the number varies exponentially with temperature. The number increases exponentially with increasing temperature 10-4 = Ce-K/I000 10-5 = Ce-K/900 Substituting Dividing, 10 = e-K(toto~) fu(10) = 2.303 = 0.000111 K Hence, K = 20,723 and C -105 , Repeating NT = 1 Q5e-20,723/600 NT -1.0 x 10-10 Bronze is a solid solution alloy of tin (Sn) dissolved in copper (Cu). The tin content is quite low. If a
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quiz3fall01 - ENSC 3313, Fall 2001 .nswer I. any 4...

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