稀土学报（英文版）
稀土學報（英文版）
희토학보（영문판）
JOURNAL OF RARE EARTHS
2014年
11期
1056-1063
,共8页
陈岩%程明%宋鸿武%张士宏%刘劲松%祝焱
陳巖%程明%宋鴻武%張士宏%劉勁鬆%祝焱
진암%정명%송홍무%장사굉%류경송%축염
as-cast pure copper%La%microstructure%mechanical property%rare earths
As-cast Cu-La alloys with La contents in the range of 0-0.32 wt.%were fabricated by vacuum melting method. The effects of La on microstructure and mechanical properties of as-cast pure copper were investigated using optical microscopy (OM), scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and tensile test. The results showed that La had obvious effects on the solidification microstructure and the grain refinement of as-cast pure copper. With the increase of La content, the ultimate tensile strength, the yield strength and the microhardness increased gradually, but the elongation increased first and then decreased while La content exceeded 0.089 wt.%. The improvement of mechanical properties was attributed to the ef-fect of grain refinement strengthening, solid solution strengthening, second phase strengthening and purifying. However, excessive adding La would deteriorate the elongation owing to the excessive Cu6La phases.
