Quiz3 MatE210 spring05 Niebuhr - Cal Poly State University...

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Unformatted text preview: Cal Poly State University, SLO D. Nicbuhr Materials Engineering Dept. Spring 2005 MatE 210 Quiz if 3 Namr , , - (please print) Section (10 points) 1. You are given 650 kg of copper and 350 kg of silver to make an alloy. Afier combining the mixture you heat it to 1075°C. Determine the following: a. Temperature and composition of the first solid to form upon slow cooling. (2) 4’5: QSD°C amél abou‘i’ 51“}0/945 a”) 6" “+17“ C“ / b. Fraction and composition of alpha and beta at -0.5° C below the eutectic isotherm.(4) ’; 0 0 ., “’3‘ - ea Woe? -~> V49)“ ‘“ 4°? - aw q - - - 4 35—? o/ Cy/‘VA 4°/ C . - A a. -—---_-> . a a 4 fi ' 97%,... q " 3 é b /3 97 . ‘1 (. z , '3 >’" M/WWWW 4 (. z , 7, .. Atomic percent silver 0 ”C 10 20 3o 40 50 60 7o 80 90 F y r“ l 1 r E T— r I 102543 { ‘ » 1900 mm 961.893" 1700 you mm 800 ~ I400 700 June 600 .v 1000 500 . ) 850 400 w ‘ W ...... (.‘n m 20 30 40 50 ~60 70 8f) 90 Ag Weight percent silver was» wmlvmdmmm mimnu-I- mama:...
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