High throughput crystal structure and composition mapping of crystalline nanoprecipitates in alloys by transmission Kikuchi diffraction and analytical electron microscopy
Journal Article
·
· Ultramicroscopy
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. Paris-Saclay, Gif-sur-Yvette (France)
Statistically significant crystal structure and composition identification of nanocrystalline features such as nanoparticles/nanoprecipitates in materials chemistry and alloy designing using electron microscopy remains a grand challenge. In this paper, we reveal that differing crystallographic phases of nanoprecipitates in alloys can be mapped with unprecedented statistics using transmission Kikuchi diffraction (TKD), on typical carbon-based electron-transparent samples. Using a case of multiphase, multicomponent nanoprecipitates extracted from an improved version of 9% chromium Eurofer-97 reduced-activation ferritic-martensitic steel we show that TKD successfully identified more than thousand M23C6, MX, M7C3, and M2X (M=Fe, Cr, W, V, Ta; X = C, N) nanoprecipitates in a single scan, something that is currently unachievable using a transmission electron microscope (TEM) without incorporating a precision electron diffraction (PED) system. Precipitates as small as ~20–25 nm were successfully phase identified by TKD. We verified the TKD phase identification using high-resolution transmission electron microscopy (HRTEM) and convergent beam electron diffraction (CBED) pattern analysis of a few precipitates that were identified by TKD on same sample. TKD study was combined with state-of-art analytical scanning transmission electron microscopy (STEM)-energy dispersive X-ray (EDX) spectroscopy and multivariate statistical analysis (MVSA) which provided the complete crystal structure and distinct chemistries of the precipitates in the steel in a high throughput automated way. This technique should be applicable to characterizing any multiphase crystalline nanoparticles or nanomaterials. Furthermore the results highlight that combining phase identification by TKD with analytical STEM and modern data analytics may open new pathways in big data material characterization at nanoscale that may be highly beneficial for characterizing existing materials and in designing new materials.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1505331
- Alternate ID(s):
- OSTI ID: 1636489
OSTI ID: 23137821
- Journal Information:
- Ultramicroscopy, Journal Name: Ultramicroscopy Journal Issue: C Vol. 202; ISSN 0304-3991
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
A transmission Kikuchi diffraction study of cementite in a quenched and tempered steel
AEM with a convergent beam
Elevated temperature transmission Kikuchi diffraction in the SEM
Journal Article
·
Fri Apr 15 00:00:00 EDT 2016
· Materials Characterization
·
OSTI ID:22587133
AEM with a convergent beam
Conference
·
Sun Jul 01 00:00:00 EDT 1984
·
OSTI ID:6481750
Elevated temperature transmission Kikuchi diffraction in the SEM
Journal Article
·
Tue May 15 00:00:00 EDT 2018
· Materials Characterization
·
OSTI ID:22804996