Evolution of long-period stacking order (LPSO) in Mg97Zn1Gd2 cast alloys viewed by HAADF-STEM multi-scale electron tomography

Kazuhisa Sato, Shunya Tashiro, Shuhei Matsunaga, Yohei Yamaguchi, Takanori Kiguchi, Toyohiko J. Konno

研究成果: Article査読

4 被引用数 (Scopus)


We have studied three-dimensional (3D) structures and growth processes of 14H-type long-period stacking order (LPSO) formed in Mg97Zn1Gd2 cast alloys by single tilt-axis electron tomography (ET) using high-angle annular dark-field scanning transmission electron microscopy. Evolution of the solute-enriched stacking faults (SFs) and the 14H LPSO by ageing were visualised in 3D with a high spatial resolution in multi-scale fields of views from a few nanometres to ~10 μm. Lateral growth of the solute-enriched SFs and the LPSO in the (0 0 0 1)Mg plane is notable compared to the out-of-plane growth in the [0 0 0 1]Mg direction. The 14H LPSO grows at the cost of decomposition of the (Mg, Zn)3Gd-type precipitates, and accompany a change of in-plane edge angles from 30 to 60°. We have updated the Time–Temperature–Transformation diagram for precipitation in Mg97Zn1Gd2 alloys: starting temperatures of both solute-enriched SFs and LPSO formation shifted to a shorter time side than those in the previous diagram.

ジャーナルPhilosophical Magazine
出版ステータスPublished - 2018 7 23

ASJC Scopus subject areas

  • Condensed Matter Physics

フィンガープリント 「Evolution of long-period stacking order (LPSO) in Mg<sub>97</sub>Zn<sub>1</sub>Gd<sub>2</sub> cast alloys viewed by HAADF-STEM multi-scale electron tomography」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。