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通过电子通道对比成像揭示的Fe-Mn高合金中冷却过程中堆垛层错聚集构成FCC-HCP马氏体相变

Stacking fault aggregation during cooling composing FCC-HCP martensitic transformation revealed by electron channeling contrast imaging in an Fe-high Mn alloy.

作者信息

Koyama Motomichi, Seo Misaki, Nakafuji Keiichiro, Tsuzaki Kaneaki

机构信息

Institute for Materials Research, Tohoku University, Sendai, Miyagi, Japan.

Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Kyoto, Japan.

出版信息

Sci Technol Adv Mater. 2021 Mar 15;22(1):135-140. doi: 10.1080/14686996.2021.1877570.

DOI:10.1080/14686996.2021.1877570
PMID:33795973
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7971214/
Abstract

To understand the mechanism of FCC-HCP martensitic transformation, we applied electron channeling contrast imaging under cooling to -51°C and subsequent heating to 150°C. The stacking faults were randomly extended and aggregated during cooling. The stacking fault aggregates were indexed as HCP. Furthermore, the shrink of stacking faults due to reverse motion of Shockley partials was observed during heating, but some SFs remained even after heating to the finishing temperature for reverse transformation (A: 104°C). This fact implies that the chemical driving force of the FCC/HCP phases does not contribute to the motion of a single SF but works for group motion of stacking faults.

摘要

为了理解面心立方（FCC）-密排六方（HCP）马氏体相变的机制，我们在冷却至-51°C并随后加热至150°C的过程中应用了电子通道对比成像技术。在冷却过程中，堆垛层错随机扩展并聚集。堆垛层错聚集体被标定为HCP结构。此外，在加热过程中观察到由于肖克莱不全位错的反向运动导致堆垛层错的收缩，但即使加热到逆转变的终了温度（A：104°C）后仍有一些堆垛层错存在。这一事实表明，FCC/HCP相的化学驱动力并非有助于单个堆垛层错的运动，而是作用于堆垛层错的集体运动。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/383225553dab/TSTA_A_1877570_F0005_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/45ef47dc3b07/TSTA_A_1877570_UF0001_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/0a13269b7b6a/TSTA_A_1877570_F0001_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/188c8ce72438/TSTA_A_1877570_F0002_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/74f1abb145bd/TSTA_A_1877570_F0003_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/d42220135502/TSTA_A_1877570_F0004_B.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/383225553dab/TSTA_A_1877570_F0005_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/45ef47dc3b07/TSTA_A_1877570_UF0001_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/0a13269b7b6a/TSTA_A_1877570_F0001_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/188c8ce72438/TSTA_A_1877570_F0002_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/74f1abb145bd/TSTA_A_1877570_F0003_OC.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/d42220135502/TSTA_A_1877570_F0004_B.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bbf4/7971214/383225553dab/TSTA_A_1877570_F0005_OC.jpg

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An unconventional hydrogen effect that suppresses thermal formation of the hcp phase in fcc steels.一种抑制面心立方（fcc）钢中密排六方（hcp）相热形成的非常规氢效应。
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Fundamental and experimental aspects of diffraction for characterizing dislocations by electron channeling contrast imaging in scanning electron microscope.用扫描电子显微镜中的电子通道衬度成像对位错进行特征分析的衍射的基础和实验方面。
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