Grain nucleation and growth behavior of a Sn-Pb alloy affected by direct current: An in situ investigation
| Autor: | Fei Cao, Fenfen Yang, Tiqiao Xiao, Yanan Fu, Wanxia Huang, Zongning Chen, Tongmin Wang, Qingxi Yuan, Huijun Kang, Rong Fan |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Polymers and Plastics Mechanical Engineering Direct current Metallurgy Alloy Metals and Alloys Nucleation 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Grain size Mechanics of Materials 0103 physical sciences Materials Chemistry Ceramics and Composites engineering Electric current Composite material 0210 nano-technology Current density Intensity (heat transfer) |
| Zdroj: | Journal of Materials Science & Technology. 33:1134-1140 |
| ISSN: | 1005-0302 |
| Popis: | In situ synchrotron X-ray radiography was used to study the effect of direct current (DC) on the grain nucleation and growth of Sn-50 wt.%Pb alloy. The results showed that applying DC adequately during solidification could effectively enhance the grain nucleation and inhibit its growth. Imaging of comparative experiments with varying DC intensity indicated that the final grain size, determined by the competition between grain nucleation and growth, was sensitively dependent on the DC intensity. It was found that the average grain size was decreased from 1632 to 567 μm with DC density of 1.5 A/mm 2 compared to the case without DC. Beyond this value, raising the current density may cause a significant decrease in the nucleation rate, and thus lead to a coarsening of the grain structure. |
| Databáze: | OpenAIRE |
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