Room-temperature tensile behaviour of bronze-processed multi-filamentary Nb3Sn superconducting materials
Room-temperature tensile behaviour of bronze-processed multi-filamentary Nb3Sn superconducting materials
复制标题
青铜加工多丝Nb3Sn超导材料的室温拉伸行为
DOI：
10.1007/bf01117390
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发表时间：
1986
影响因子：
4.5
通讯作者：
T. Uehara
中科院分区：
文献类型：
--
作者：
Shojiro Ochiai;K. Osamura;T. Uehara
用室温拉伸试验研究了青铜法制备的多相Nb_3Sn超导复合材料的结构及其与断裂行为的关系。有两种类型的骨折模式。第一类表现出高的延伸率，伴随着明显的塑性变形的复合材料作为一个整体和Nb 3Sn层表现出多个断裂。II型没有表现出明显的塑性变形和复合材料断裂的脆性方式。当Nb_3Sn层的分数很小时，发生I型，并且由于Nb_3Sn层的断裂而导致的承载能力的下降可以主要通过Nb、Cu-Sn和Cu的韧性组分的应变硬化来补偿。另一方面，当Nb_3Sn层的分数较大时，发生II型，Nb_3Sn层的断裂导致复合材料整体断裂。为了描述这两种类型的复合材料的拉伸强度，提出了一个模型，该模型很好地解释了实验结果。结果表明，Nb_3Sn层的强度随着复合材料直径的增大、退火温度的升高和退火时间的延长而降低。
Structure and its relation to fracture behaviour of multi-filamentary Nb3Sn superconducting composite materials prepared by the bronze method were studied by tensile testing at room temperature. There were two types of fracture mode. Type I showed high elongation, accompanied by apparent plastic deformation of composites as a whole and the Nb3Sn layer exhibited multiple fracture. Type II showed no apparent plastic deformation and the composites fractured in a brittle manner. Type I occurred when the fraction of the Nb3Sn layer was small and the drop of load-bearing capacity due to fracture of Nb3Sn layer could be compensated mainly by strain hardening of ductile constituents of Nb, Cu-Sn and Cu. On the other hand, Type II occurred when the fraction of Nb3Sn layer was large and the fracture of the Nb3Sn layer caused fracture of composites as a whole. To describe the tensile strength of composites for both types, a model was proposed, which explained well the experimental results. It was found that the strength of the Nb3Sn layer decreases with increasing diameter of composites and with increasing annealing temperature and time.