Study Of Non-equilibrium Solidification To Fe-Ga Alloy Magnetostriction Performance

This article has studied the different ingredient and the different preparation craft to the Fe-Ga alloy phase structure and the magnetostriction performance influence, seeks for the special nature which they have, to form the mechanism and other related natures. Used the vacuum arc furnace to smelt the law to prepare different ingredient key metal Fe100-xGax (x=16,17,18,19,20), the use self-restraint's rapid orientation coagulation law has prepared different ingredient Fe100-xGax (x=17,18,19) alloy test specimen, after Fe81Ga19 alloy deep underheating processing, obtained the alloy test specimen the deep underheating melt stimulation directional freeze, obtained the following main result:1. Ga content has the obvious influence to the alloy magnetostriction performance, the Ga content is 18% cast condition Fe-Ga alloy magnetostriction is biggest, achieves 62×10-6; The Ga content is 16% cast condition Fe-Ga alloy magnetostriction is smallest, only then 39×10-6.2. Fe-Ga alloy magnetostriction performance not only related moreover also has the connection with the phase structure with the crystal grain growth orientation. In order to inquire about that between them the relations, used the rapid orientation coagulation installment to prepare the Fe-Ga test specimen, the test specimen by parallel the big columnate crystals which grew along the gradient of temperature have been composed mutually, columnar grain's size was situated between 150μm to 400μm between. After the transmission electron microscope discovered that in the alloy is distributing the non-uniform phase structure, by a2 phase structure primarily, meanwhile has by the B2 unit cell constitution ultra lattice form existence attachment.3. used the fusing glass purification and circulation overheated compound method causes the Fe81Ga19 alloy to obtain the degree of supercooling respectively beδT=157k,80k,30k deep underheating melt.4. uses the rapid orientation coagulation installment to take the stimulation source, makes the deep underheating melt stimulation directional freeze to grow, the material magnetostriction value which obtains has the huge promotion, usesδT=157k after the deep underheating melt direction detection stimulates, the material saturated magnetostriction strain achieves 181×10-6.