摘要
采用粉末冶金反应烧结结合高能球磨的方式制备了MgB_2超细粉末,烧结后X射线衍射(XRD)表明合成MgB_2的纯度较高,球磨后由于晶粒尺寸减小以及晶体中微观应力增加使得MgB_2衍射峰的强度下降而且宽度增加,但球磨后颗粒的高分辨透射电镜像及相应的选区电子衍射表明球磨后MgB_2的晶体结构依旧完整。采用粉末冶金工艺制备了MgB_(2p)/Cu复合材料,扫描电镜观察表明MgB_2颗粒在铜基体中分布均匀。线扫描结果表明在MgB_2颗粒与铜基体之间存在Mg、Cu元素的互扩散现象。性能测试结果表明,相同体积分数情况下,MgB_(2p)/Cu复合材料的相对密度、硬度、拉伸强度以及导电性能优于TiN_p/Cu复合材料和AlN_p/Cu复合材料,是一种有效的弥散强化相。
MgB2 powders were fabricated by powder metallurgy reaction followed by high energy ball milling. X-ray diffraction of MgB2 after sintering showed the produced MgB2 with high purity. The intensities of the diffraction peaks for MgB2 decreased but their width increased as a the result of reduced grain size and the presence of microstress introduced during the high energy ball milling. High-resolution electron microscopy （HREM） and selected area diffraction showed the MgB2 particles were single crystals. MgB2p/Cu composites were fabricated by powder metallurgy. The MgB2 particles uniformly distributed in the copper matrix. Line scanning and EDS revealed the occurrence of mutual-diffusing at the interface of the MgB2 particles and copper matrix. Mechanical testing showed that the relative density, hardness and tensile strength of the MgB2p/Cu composites was higher than those of the TiN p/Cu and AlN p/Cu composites with the same concentrations of the particulate phases. The above results demonstrated that the MgB2 particle is an effective dispersion-strengthened phase for making copper matrix composites.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A01期330-333,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50572068)
天津市高等学校科技发展基金(20060904)
关键词
MGB2
铜基复合材料
制备
性能
MgB2
copper-matrix composites
fabrication
properties
