Accession Number : AD0018771


Title :   MAGNETOSTRICTION CONSTANTS IN IRON-COBALT ALLOYS


Corporate Author : CARNEGIE INST OF TECH PITTSBURGH PA LAB FOR MAGNETIC RESEARCH


Personal Author(s) : Urquhart, Helen M A ; Azumi, K ; Goldman, J E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/018771.pdf


Report Date : Aug 1953


Pagination or Media Count : 23


Abstract : The single crystal magnetostriction constants in the Fe-Co system from 0-70% Co were measured using the resistance strain gage method. Small single crystals in the form of oblate spheroids were employed for the measurements. In the composition range for which no single crystals could be obtained, the constants were obtained from polycrystalline measurements using the method of Bates and Lee. The results obtained by the 2 methods give continuous curves for the 2 significant magnetostriction constants lambda 100 and lambda 111 over the entire composition range of interest. The curve for lambda 100 reaches a maximum near 30% Co and gives a value of 150x10-6 which represents the highest measured magnetostriction constant obtained in a metallic sample; the curve for lambda 111 goes through zero at approximately 40% Co which is near the composition at which the magnetic crystalline anisotropy reverses sign.


Descriptors :   *COBALT ALLOYS , *MAGNETOSTRICTION , RESISTANCE , SINGLE CRYSTALS , METAL CRYSTALS , STRAIN GAGES , POLYCRYSTALLINE , MAGNETIC FIELDS , MEASUREMENT , ANISOTROPY


Subject Categories : Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE