The 267th CMSM Special Seminar 
Unveiling microstructure-property relationships in functional and structural materials by TEM and 3DAP
Dr. Keita Nomoto
ARC DECRA Fellow,
School of Aerospace, Mechanical and Mechatronic Engineering,
The University of Sydney, Australia
Date & Time: 15:30 - 16:30, September 25th (Wed), 2024.
Place: 8th floor middle seminar room, 8F, Main Bldg., Sengen site.
Abstract:
The atomic arrangement and local chemistry of materials are crucial in determining their structural and functional properties, such as mechanical strength, corrosion resistance, and electrical conductivity. Microstructural characterisation techniques, including TEM and APT, provide a deep understanding of the microstructure-property relationships. In this talk, I will explore these relationships in three materials: silicon nanocrystals (Si NCs), bulk metallic glass (BMG), and laser powder bed fusion (L-PBF) copper alloy. APT reveals the dopant atom distribution in Si NCs, which is critical for tuning the optoelectronic properties [1,2]. In BMG, the excellent mechanical strength is linked to the size and volume fraction of medium-range order clusters, analysed via nano-beam electron diffraction and APT cluster analysis [3,4]. For L-PBF copper alloy, I will discuss the tin (Sn)-rich phase formation in Cu-10Sn and its impact on mechanical properties. Furthermore, the powder-structure-property relationship offers insights for designing alloys with enhanced mechanical and conductive properties.
[1] K. Nomoto et al., Nanoscale 12 (2020) 7256
[2] K. Nomoto et al., Acta Mater. 178 (2019) 186
[3] K. Nomoto et al., Phys. Rev. Mater., 6 (2022) 043603
[4] K. Nomoto et al., Materials Today, 44 (2021) 48
(Contact)
Taisuke Sasaki (Ext. 2466), Nanostructure Analysis Group, CMSM. E-mail:
SASAKI.Taisuke[at]nims.go.jp
