【作者】 王璐；

【导师】 丁雨田；

【作者基本信息】 兰州理工大学 ， 材料加工工程， 2011， 硕士

【摘要】 本文研究了不同成分和不同制备工艺对Fe-Ga合金相结构和磁致伸缩性能的影响,寻找它们具有的特殊性质、形成机制和其它相关物性。采用真空电弧炉熔炼法制备了不同成分的母合金Fe100-xGax(x=16,17,18,19,20),使用自制的快速定向凝固法制备了不同成分的Fe100-xGax(x=17,18,19)合金试样,Fe81Ga19合金深过冷处理后,将深过冷熔体激发定向凝固获得合金试样,得到如下主要结果：1.Ga含量对合金的磁致伸缩性能有明显的影响,Ga含量为18%的铸态Fe-Ga合金的磁致伸缩最大,达到62×10-6；Ga含量为16%的铸态Fe-Ga合金的磁致伸缩最小,只有39×10-6。2.Fe-Ga合金磁致伸缩性能不仅与相结构有关而且还与晶粒的生长取向也有关联。为了探寻它们之间的关系,采用快速定向凝固装置制备了Fe-Ga试样,试样由相互平行的沿着温度梯度生长的大的柱状晶组成,柱状晶粒的大小介于150μm到400μm之间。经过透射电镜发现合金中分布着不均匀的相结构,以A2相结构为主,同时还有以B2单胞构成的超点阵形式存在的附加相。3.采用熔融玻璃净化和循环过热复合法使Fe81Ga19合金获得了过冷度分别为ΔT=157k,80k,30k的深过冷熔体。4.使用快速定向凝固装置作为激发源,使深过冷熔体激发定向凝固生长,获得的材料磁致伸缩值有巨大提升,其中使用ΔT=157k的深过冷熔体定向激发后材料饱和磁致伸缩应变λ达到181×10-6。更多还原

【Abstract】 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.更多还原