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Unformatted text preview: ENSC 3313, Fall 2001 Quiz 12 Name Answer any 4 Questions only, 1 point each This loop is for an Fe -45% Ni alloy, called Pennalloy. Correlate the diagram to the name! This is a loop for a Rennanent magnet. We see that very little magnetism is lost when the applied field is reduced to zero. Also, the loop is broad, needing a significant reversed field to reduce the magnetism to zero. 45 Permalloy ~ .. e ~ I Q. e G 2 ~ 0 20 H, amp -turns /m 40-40-20 2 Fe can be alloyed with AI, Ni and Co and heat treated to produce powerful peffi1anent "Alnico" magnets. The micrograph below shows the microstructure of an Alnico magnet x 50,000. Please explain how the microstructure contributes to the peffi1anent retention of magnetic properties. Pemlanent magnets can lose their magnetic properties if domain walls move. One strategy to prevent domain wall movement is by introducing phase boundaries. The intimate two-phase structure of Alnico has a lot of phase boundary to hinder any domain wall movement....
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This note was uploaded on 01/10/2012 for the course ENSC 3313 taught by Professor Staff during the Fall '11 term at Oklahoma State.
- Fall '11