3D X-Ray Diffraction Characterization of Grain Growth and Recrystallization in Rolled Braze Clad Aluminum Sheet,Advanced Engineering Materials

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3D X-Ray Diffraction Characterization of Grain Growth and Recrystallization in Rolled Braze Clad Aluminum Sheet
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2021-05-27 , DOI: 10.1002/adem.202100126
Torkel Stenqvist _{1,

2} , Johan Hektor _{3,

4,

5} , Sara Bylund ₁ , Robert Moberg ₆ , Mårten O. M. Edwards , Stephen A. Hall _{7,

8} , Lars-Åke Näslund _{1,

2}

Affiliation

Braze clad on aluminum (Al) sheets has enabled fast and convenient brazing assembly of complex heat exchangers. However, there are details in the brazing process that are not fully understood. Herein, 3D X-ray diffraction (3DXRD) is used to investigate the grain position, size, and orientation before and after controlled atmosphere brazing (CAB). The outcomes are presented as maps of center-of-mass positions with relative grain size distribution and color-coded grain orientations. The results show that, for braze clad Al sheets exposed to CAB simulation, it is possible to distinguish grains from the solidified AlSi alloy from those in the core Al alloy. It is also possible to distinguish new grains obtained through recrystallization during CAB. Hence, the study shows that stretching of the rolled Al sheet by 6% provides enough stored energy in the core material so that recrystallization occurs during CAB and, in addition, provides conditions for AlSi alloy grain growth into the core material. While the phenomenon is well known, it is poorly understood for processes in connection with brazing of mechanically formed Al alloy components in heat exchanger assemblies, and these results demonstrate the potential for gaining deeper insights through 3DXRD.

中文翻译：

轧制钎焊复合铝板中晶粒生长和再结晶的 3D X 射线衍射表征

铝 (Al) 板上的钎焊包覆使复杂换热器的钎焊组装变得快速而方便。然而，钎焊过程中还有一些细节尚未完全了解。在此，3D X 射线衍射 (3DXRD) 用于研究可控气氛钎焊 (CAB) 前后的晶粒位置、尺寸和取向。结果显示为具有相对粒度分布和颜色编码晶粒取向的质心位置图。结果表明，对于暴露于 CAB 模拟的钎焊复合铝板，可以区分晶粒与凝固的铝Si合金来自那些以Al合金为核心的合金。还可以区分在 CAB 过程中通过再结晶获得的新晶粒。因此，研究表明，轧制铝板拉伸 6% 为芯材提供了足够的储存能量，从而在 CAB 过程中发生再结晶，此外，还为 Al  Si 合金晶粒生长到芯材中提供了条件。虽然这种现象是众所周知的，但对与热交换器组件中机械成型的铝合金部件的钎焊相关的工艺知之甚少，这些结果证明了通过 3DXRD 获得更深入见解的潜力。

更新日期：2021-05-27

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