急冷Al-Si合金超导电性的研究

本文研究了热处理对急冷Al-11.3at％Si合金的微观结构及超导电性的影响,结构分析表明,液态淬火的样品由两相组成:过饱和α-Al(Si)固溶体晶体相和Al,Si原子按统计分布的非晶相,经100℃/50小时热处理后,α-Al(Si)固溶体贫化,非晶相中析出Si的小颗粒,经200℃/100小时热处理的样品已趋向平衡态结构,测量了样品的临界温度,在研究磁场中的超导-正常转变时发现了反常的磁阻效应,它可以用样品中存在两个超导相的模型予以解释。关键词：

A STUDY OF THE SUPER-CONDUCTIVITY OF FAST QUENCHED Al-Si ALLOY

The effect of heat treatment on the microstrueture and Superconducting properties of the eutectic alloy Al- 11.3 at % Si prepared by the splat quenching technique has! been studied. The results of structure analyses indicated that the rapidly cooled Al-11.3 at % Si alloy consists of two phases: a supersaturated α-Al(Si) solid solution and an amorphous phase of Al and Si atoms which are distributed statistically. After annealing at 100℃ for 50 hr. the Si content of the solid solution phase is reduced and some dispersive Si granules separate out from the amorphous phase. After annealing at 200℃ for 100 hr. the specimens precipitated completely. Superconducting transition temperature T_c was measured. The anomalous magnetoresistivity in supereondueting-normal transitions has been found in the sample after annealing at 100℃ for 50hr. Our results reveal the existence of two superconducting phases in this sample.