作　　者： ; ; ; ; ; ;

机构地区： 华南理工大学机械与汽车工程学院

出　　处： 《功能材料》 2004年第1期42-45,共4页

摘　　要： 　在氩气气氛中用熔炼法制备了[Co80Fe10Ni10]20Cu80-xCrx系列Cu基巨磁电阻合金,通过光学显微镜、透射电子显微镜、场致发射扫描电镜和电子探针研究了[Co80Fe10Ni10]20Cu80-xCrx合金在1000℃均匀化处理6h后水淬,以及随后的300～700℃,30～150min回火处理的微观结构及组分。用直流四探针法测量了合金的室温巨磁电阻效应(GMR)。结果表明,合金在回火时从基体相中析出了高度弥散的含Fe、Ni、Co的纳米磁性新相。回火温度对合金的磁电阻效应影响很大,样品在600℃温度回火90min时,合金的室温GMR效应最好,可达8.61%。少量合金元素Cr的添加替代(Cr代Cu)消除了Co Fe Ni Cu合金中的混溶裂隙,改善了合金的加工性但也降低了合金的磁电阻效应。 A series of [Co80Fe10Ni10]20 Cu80-xCrx Cu-based alloys were prepared by arc melting under purified argon atmosphere. By means of optical microscopy (OM), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM) and EP, microstructure and phase constituents were investigated for [Co80Fe10Ni10]20 Cu80-xCrx alloys homogenized at 1000°C for 6 h, then quenched in water, subsequently tempered at 300-700°C for 30-150 min. The giant magnetoresistance (GMR) of the alloys were measured by a DC four-point method at room temperature. The results show that, the nanometer-sized magnetic new phase contains Fe, Ni, Co, which precipitated in the matrix phase. The tempering temperature has great influence on GMR, the best GMR effect of [Co80Fe10Ni10]20 Cu80-xCrx alloys reaches 8.61% after tempering at 600°C for 90 min. A small amount of Cr substituting for Cu which eliminates miscibility gap existing in Co-Fe-Ni-Cu alloy and improves its workability, but decreases GMR effect in [Co80Fe10Ni10]20 Cu80-xCrx alloys.

关 键 词： 巨磁电阻效应 钴基合金 纳米磁性颗粒 巨磁电阻材料 块体合金

领　　域： [电气工程] [一般工业技术]