The mechanism of Fe-rich intermetallic compound formation and growth on inoculants revealed by electron backscattered diffraction and X-ray imaging
The mechanism of Fe-rich intermetallic compound formation and growth on inoculants revealed by electron backscattered diffraction and X-ray imaging
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DOI：
10.1016/j.matdes.2023.112110
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发表时间：
2023-08
期刊：
影响因子：
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通讯作者：
S. Feng;Zelong Jin;W. Du;Insung Han;A. Lui;Xiaoping Zhou;P. Shearing;P. Grant;E. Liotti
中科院分区：
文献类型：
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作者：
S. Feng;Zelong Jin;W. Du;Insung Han;A. Lui;Xiaoping Zhou;P. Shearing;P. Grant;E. Liotti
富铁金属间化合物对铝合金的力学性能和可回收性有着重要的影响。越来越多的努力已经花在这些金属间化合物的孕育，希望促进更精细的分布。最近Al-5 Ti-1B（wt.%），最初开发的是对α-Al进行再结晶，现已证明可以再结晶Al 13 Fe 4，这是一种存在于各种铝合金中的金属间相。然而，孕育剂上金属间化合物的形成和生长机制尚不清楚。本文通过在含铁铝合金中添加Ti，使Al-5 Ti-1B合金中产生大量的活性孕育剂Al 3 Ti颗粒。我们使用电子背散射衍射，原位同步辐射X射线照相和后固化X射线计算机断层扫描相结合，调查初级Al 13 Fe 4的形成和生长的Al 3 Ti孕育剂，首先在模型Al-Fe合金，关键的见解，然后在高含铁，回收6xxx合金确认。综合分析了Al_（13）Fe_4和Al_3 Ti之间的晶体取向关系，揭示了Al_（13）Fe_4在Al_3 Ti上的形成和生长动力学。一个强有力的链接之间的形成Al 13 Fe 4的Al 3 Ti和孪生相关的伪对称性的Al 13 Fe 4。最后，提出了一种提高回收合金中Fe含量的潜在策略，以减少金属间化合物和α-Al。
Fe-rich intermetallics affect critically the mechanical properties and recyclability of aluminium alloys. Increasing effort has been spent on the inoculation of these intermetallics, hoping to promote a finer distribution. Recently Al-5Ti-1B (wt.%), originally developed to rene α-Al, has been shown to rene Al13Fe4, an intermetallic phase present in a variety of Al alloys. However, mechanisms of the formation and growth of the intermetallics on the inoculants are unclear. In this paper, Ti is added to Fe-containing Al alloys to produce a large number of potent Al3Ti particles, the active inoculant in Al-5Ti-1B. We use a combination of electron backscattered diffraction, in situ synchrotron X-ray radiography and post-solidication X-ray computed tomography to investigate the formation and growth of primary Al13Fe4 on Al3Ti inoculants, first in a model Al-Fe alloy, with key insights then confirmed in a high Fe-containing, recycled 6xxx alloy. Crystallographic orientation relationships between Al13Fe4 and Al3Ti are analysed comprehensively, and the formation and growth dynamics of Al13Fe4 on Al3Ti is also unveiled. A strong link is revealed between the formation of Al13Fe4 on Al3Ti and a twinning-related pseudo-symmetry of Al13Fe4. Finally, a potential strategy to rene both intermetallics and α-Al in recycled alloys with elevated Fe concentration is proposed.