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Research Work

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Atomic configuration of an eta precipitate.

01

Al-Zn-Mg-Cu aluminium alloys

Multi-types of precipitates can be created in the advanced high-strength 7xxx series (Al-Zn-Mg-Cu) aluminium alloys, subjected to ageing treatments. Employed high-resolution transmission electron microscopy (HR-TEM) and Cs-corrected high angle annular dark-field scanning transmission electron microscopy (Cs-corrected HAADF STEM), it can elucidate the microstructure evolutions of precipitates and further to correlated their mechanical properties.

02

Al-Cu-Mg-(Li) aluminium alloys

Cs-corrected HAADF-STEM was employed to investigate the microstructure evolutions of nanometer-sizes precipitates such as T1, theta' and S phases; and the corresponding three GP zones, respectively, in the Al-Cu-Mg-Li aluminium alloy. Two nucleation mechanisms of GP zones were characterized as the separated nucleation, and the sympathetic nucleation. The more detailed information...

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03

High-Entropy alloys

After cold-rolling and annealing, an FeCoNiCr high-entropy alloy had a bimodal-grained structure with two peak size distributions, as well as micro-scaled and nanometer-scaled annealing twins. After a Hopkinson bar compression deformation at strain rates of 7000 s-1 at 25 °C. The ultra-fine annealing-nanotwin of 5.2 nm thickness was revealed to be further partitioned by two variants of deformation-nanotwins of 0.6 nm thickness. The hierarchical structures, composed of micrometer, nanometer and sub-nanometer twins, are herewith reported.

04

Bainitic Steels

Si-Mn containing steels were treated by the low-temperature isothermal transformation of bainite.

It can be produce sub-unit plates of bainitic ferrite and film-type austenite.

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Semiconductor and Antique Materials

We also employ Cs-STEM to focus on the microstructure evolution of 2D materials (i.e., InS), Ge quantum dots and Nephrite (和闐玉).  

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和闐玉-STEM image

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