【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。更多还原

【Abstract】 A series of [Co₈₀Fe₁₀Ni₁₀]₂₀Cu_80-xCr_x Cu-based alloys were prepared by arc melting under purified argon atmosphere. By means of OM, TEM, FESEM and EP, microstructure and phase constituents were investigated for [Co₈₀Fe₁₀Ni₁₀]₂₀Cu_80-xCr_x alloys homogenized at 1000℃ for 6h, then quenched in water, subsequently tempered at 300～700℃ for 30～150min. The giant magnetoresistance of studied 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 giant magnetoresistance, the best GMR effect of [Co₈₀Fe₁₀Ni₁₀]₂₀Cu_80-xCr_x alloys reaches 8.61% after tempering at 600℃ for 90min. A small amount of Cr substituting for Cu which eliminates miscibility gap existing in Co-Fe-Ni-Cu alloy and improves its workability, but also decreases GMR effect in [Co₈₀Fe₁₀Ni₁₀]₂₀Cu_80-xCr_x alloys.更多还原