Three dimensional microstructures and wear resistance of Al-Bi immiscible alloys with different grain refiners
Three dimensional microstructures and wear resistance of Al-Bi immiscible alloys with different grain refiners
复制标题
不同晶粒细化剂Al-Bi难混溶合金的三维显微组织及耐磨性
DOI：
10.1007/s11431-015-5816-1
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发表时间：
2015-04
期刊：
影响因子：
--
通讯作者：
Tingju Li
中科院分区：
文献类型：
--
作者：
Jing Zhu;Yanan Fu;Tiqiao Xiao;Tingju Li
采用同步x射线显微断层扫描技术研究了不同晶粒细化剂（Al-5Ti-B、Al-3B和Al-3Ti） Al-Bi合金的三维显微组织。通过摩擦磨损试验验证了微观组织与相应磨损行为之间的关系。采用扫描电子显微镜（SEM）对15和60 N载荷下晶粒细化试样的磨损表面进行了分析。结果表明，晶粒细化剂的加入有利于Al-Bi合金中富bi颗粒的尺寸和分布。与Al-5Ti-B和Al-3B晶粒细化剂相比，添加Al-3Ti晶粒细化剂后，富bi颗粒分布更均匀，呈球形，尺寸更小。Al- 3ti细化后的Al-20wt%Bi合金比Al- 5ti - b和Al- 3b细化后的Al-20wt%Bi合金具有更好的耐磨性，这与Al基体中富Bi颗粒细小且分布均匀的组织相对应。
The three dimensional (3D) microstructures of Al-Bi alloys with different grain refiners (Al-5Ti-B, Al-3B and Al-3Ti) have been studied using synchrotron X-ray microtomography. The relationships between the microstructures and the corresponding wear behavior are verified through the friction and wear tests. The worn surfaces of the samples with grain refiners tested under 15 and 60 N loads are analyzed using Scanning Electron Microscopy (SEM). The results indicate that the addition of grain refiners is beneficial to the size and distribution of the Bi-rich particles in Al-Bi alloys. Compared with Al-5Ti-B and Al-3B grain refiners, the Bi-rich particles are more uniformly distributed and spherical with finer size with the addition of Al-3Ti grain refiner. The refinement renders the Al-20wt%Bi alloy refined by Al-3Ti the superior wear resistance with respect to those refined by Al-5Ti-B and Al-3B grain refiners, corresponding to the microstructures with fine and uniformly distributed Bi-rich particles in the Al matrix.
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