微观结构
材料科学
极限抗拉强度
铜
扫描电子显微镜
延伸率
压痕硬度
镧
透射电子显微镜
冶金
光学显微镜
拉伸试验
粒度
复合材料
化学
纳米技术
无机化学
作者
Yan Chen,Ming Cheng,Hong-Wu Song,Shihong Zhang,Jinsong Liu,Yan Zhu
标识
DOI:10.1016/s1002-0721(14)60183-6
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 Cu6La phases.
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