Real time investigation of the grain refinement dynamics in zinc alloy by synchrotron microradiography
Real time investigation of the grain refinement dynamics in zinc alloy by synchrotron microradiography
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DOI：
10.1016/j.jallcom.2015.01.021
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发表时间：
2015-05
影响因子：
6.2
通讯作者：
Fei Chen;F. Mao;Zhenjing Xuan;G. Yan;Jingyu Han;Tongmin Wang;Z. Cao;Ya-nan Fu;T. Xiao
中科院分区：
文献类型：
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作者：
Fei Chen;F. Mao;Zhenjing Xuan;G. Yan;Jingyu Han;Tongmin Wang;Z. Cao;Ya-nan Fu;T. Xiao
通过在␣合金中加入原位生成的Al-TiB2中间合金，研究了二硼化钛颗粒在锌合金中的细化性能。结果表明，TiB2颗粒能显著细化ZA27的组织。加入1.1%TiB_2后，TiB_2的平均晶粒尺寸从205.4μm显著减小到65.8nμm。为了研究TiB_2细化晶粒的机理，首次用同步辐射显微照相技术研究了TiB_2对晶粒形核和生长动力学的影响。实时观察表明，TiB2颗粒通过促进异质形核、促进枝晶破碎和抑制枝晶生长来细化ZA27。
The grain refining performance of titanium diboride particles in zinc alloy was investigated by adding in␣situ formed Al–TiB2master alloy into ZA27 alloy. The results showed that TiB2particles could significantly refine the structure of ZA27. After adding 1.1% TiB2, the average grain size decreased markedly from 205.4 μm to 65.8 μm. To characterize the mechanism by which TiB2refines the grain size, synchrotron microradiography technique was used for the first time to investigate the effect of TiB2on the grain nucleation and growth kinetics. Real-time observations revealed that TiB2particles refine ZA27 by facilitating heterogeneous nucleation, enhancing dendrite fragmentation and constraining the dendrite growth.