In the semiconductor industry, A1 wiring is sometimes alloyed with Cu to improve

Question

In the semiconductor industry, A1 wiring is sometimes alloyed with Cu to improve its long-term performance as an electrical conductor. Which of the following will likely have the highest mechanical strength? 100 wt.% Al 99.5 wt.% Al, 0.5 wt.% Cu 99.0 wt.% Al, 1.0 wt.% Cu 98.5 wt.% Al, 1.5 wt.% Cu No difference During two successive flexural strength tests of a brittle ceramic, the separation distance (L) between support points was decreased by 2x. What effect would this have on the measured tensile load at fracture? Increased by 2x Decreased by 2x Increased by 4x Decreased by 4x No effect In which of the following systems is diffusion likely to occur by an interstitial mechanism? There can be more than one correct answer. Cu in Cu Fe in Cu C in Cu Zn in Cu H in Cu

Explanation / Answer

6) The correct answer is (c) 99.0 wt% Al, 1.0 wt% Cu will likely to have the highest mechanical strength.

7) The correct answer is (a) The measured tensile load at fracture will be increased by 2x.

8) The correct answers are (c) C in Cu and (e) H in Cu .

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