Effects of lanthanum addition on microstructure and mechanical properties of as-cast pure copper
来源期刊：JOURNAL OF RARE EARTHS2014年第11期
论文作者：陈岩 程明 宋鸿武 张士宏 刘劲松
文章页码：1056 - 1063
摘 要：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 effect of grain refinement strengthening, solid solution strengthening, second phase strengthening and purifying. However, excessive adding La would deteriorate the elongation owing to the excessive Cu6 La phases.
陈岩1，程明1，宋鸿武1，张士宏1，刘劲松2
1. Institute of Metal Research, Chinese Academy of Sciences2. School of Materials Science and Engineering, Shenyang Ligong University
摘 要：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 effect of grain refinement strengthening, solid solution strengthening, second phase strengthening and purifying. However, excessive adding La would deteriorate the elongation owing to the excessive Cu6 La phases.
关键词：
