W A T K I N S - J O H N S O N C O M P A N Y Semiconductor Equipment Group

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Engineering 45
MT2 Exam Review
Bruce Mayer, PE Registered Electrical
Mechanical EngineerBMayer_at_ChabotCollege.edu
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Paper Creep
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Paper Creep
Find a LINEAR equation, e(t), that approximates
the creep of paper over 1-100 minutes
A. Dwan, Paper Complexity And The Interpretation
Of Conservation Research , Journal of the
American Institute of Conservation, Vol. 26, No.
1, pp. 1-17), 1987
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Draw Good Line, Find 2-pts
?2.47
?2.16
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Lever-Law vs. T Problem

• Pb-Mg Alloy ? 45 wt Pb
• Quenched from Hi-Temp at Which The Alloy is a
  solid with Phase Fractions
• Wa 65 and WMg2Pb 35
• Find the Approximate Temperature from Which the
  Alloy was Quenched

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• Freeze-In Problem

• Freeze In

• For Troom Equil

45
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• T for Pure a 26.5Pb

• Freeze in from 360C

360
25.6
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Lever-Law vs. T Problem Ans
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Prob 10.9 ? Avrami Eqn

• Given that A?P Transformation obeys the Avrami
  Eqn

• Given Xform Data

• Then find the time Required for 95 Transformation

Xformed, y Time, t (S)
20 420
60 425
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P10.9 MATLAB Solution
gtgt Y1 log(log(1/0.8)) Y1 -1.4999 gtgt Y2
log(log(1/0.4)) Y2 -0.0874 gtgt X1
log(280) X1 5.6348 gtgt X2 log(425) X2
6.0521 gtgt P X1, 1 X2, 1 5.6348
1.0000 6.0521 1.0000 gtgt Q Y1 Y2 Q
-1.4999 -0.0874
gtgt z P\Q z 3.3849 -20.5732 gtgt n z(1) n
3.3849 gtgt k exp(z(2)) k
1.1620e-009 gtgt t ((log(1/.05))/k)(1/n) t
603.0849
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Pb-Sn Solders