Nb3Al超导线材在未来磁约束核聚变堆和其它高磁场磁体中具有广阔的应用前景，Nb3Al超导材料的制备技术及其低温、力学、电磁学性能的研究是实现其应用的关键。本项目拟在现有Nb3Al超导材料制备技术的基础上，探索一系列新的制备技术如电弧冶炼法、磁控溅射法、热等静压法、电解还原和渗透法、自蔓延高温合成法、真空蒸镀法等，通过调整反应工艺参数并结合掺杂工艺获得一系列不同结构和性能的Nb3Al超导材料。对所获得的Nb3Al超导材料的相结构、化学成分、超导性能、电磁性能及力学性能等进行全面表征，通过研究组成、晶体结构与超导性能、电磁性能和力学性能的关联，以及晶体结构、性能与制备工艺参数的关联，重点探讨Nb3Al超导材料的成相特征，归纳、总结系统的物理规律特性与结构相图，获得优化Nb3Al超导线材的制备工艺，以解决Nb3Al超导材料在磁约束核聚变堆磁体应用中存在的关键基础性问题。

Nb3Al superconductor has broad applications in future magnetic confinement fusion reactors and other high magnetic field magnets. The key to achieve these applications is to clarify the preparation technology and low temperature, mechanical, electromagnetic properties of Nb3Al superconductor. This proposal is aimed to develop of a series of new preparation technology, such as arc smelting method, magnetron sputtering, hot isostatic pressing, electrolytic reduction and infiltration technique, self-propagating high temperature synthesis, and vacuum deposition, to construct novel structure and performance materials on the basis of Nb3Al superconductor through adjusting the reaction process parameters and elemental doping. The phase structure, chemical composition, superconductivity, electromagnetic properties and mechanic properties of the Nb3Al superconductor are investigated in detail. Investigate the relations between the composition, crystal structure and superconductivity, electromagnetic properties and mechanic properties, as well as the relations between the crystal structure, performance and preparation process parameters. Emphasis is placed on the phase characteristics of Nb3Al superconductor. The preparation processes of Nb3Al superconductor are optimized to obtain the laws of physics features and structure of the phase diagram. This study is supposed to solve the key fundamental issues of the Nb3Al superconductor application to magnetic confinement fusion reactor magnets.