Microanalysis and cell boundary velocity measurements for the cellular reaction in a Mg-9% Al alloy
Microanalysis and cell boundary velocity measurements for the cellular reaction in a Mg-9% Al alloy
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DOI：
10.1098/rspa.1978.0015
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发表时间：
1978-01
期刊：
影响因子：
--
通讯作者：
D. A. Porter;J. W. Edington
中科院分区：
文献类型：
--
作者：
D. A. Porter;J. W. Edington
镁铝合金在时效时通过胞状反应分解，产生大的晶胞(直径约5-50μm)，由细小的镁铝固溶体片层和Mg17Al12金属间化合物组成。本文报道了在一定温度范围内老化形成的细胞中个别点的直接、高分辨率显微分析。通过一种新的技术，首次将结果与在微观分析的相同区域进行的细胞边界速度的测量结合起来。结果表明，溶质重分布主要发生在晶胞边界。此外，由于晶界扩散系数或铝与晶界之间相互作用能的不同，不同晶界之间的分布关系也不同。
Mg-Al alloys decompose on ageing via a cellular reaction that produces large cells ( ca. 5-50 μm in diameter) consisting of alternating fine lamellae of Mg-Al solid solution and Mg17 Al12 intermetallic compound. This paper reports direct, high resolution microanalysis of individual points in cells formed by ageing over a range of temperatures. The results are combined for the first time with measurements, by a novel technique, of cell boundary velocity made in the same regions that were microanalysed. It is shown directly that solute redistribution occurs primarily in the cell boundary. Furthermore the relation between profiles varies for different cell boundaries, probably because of differences in the boundary diffusion coefficient or the interaction energy between aluminium and the grain boundary.