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Effect of small/large alternative extrusion cycles and precipitates on the super high strength of A800 (Al-Zn-Mg-Cu) aluminium alloys

International Conference on Metal, Mining and Magnetic Materials

November 01-02 , 2018 Paris , France

Tsai Fu Chung , Wayne Hong, Chien Nan Hsiao, Chan Tung Chen, Manny Lin, Wei Chih Li and Jer Ren Yang

National Taiwan University, Taiwan Advanced Material Specialty, Inc., Taiwan National Applied Research Lab, Instrument Technology Research Center, Taiwan E A Fischione Instruments Inc, USA

ScientificTracks Abstracts: J Mat. Sci

DOI: 10.4172/2321-6212-C7-032


The Al-Zn-Mg aluminium alloys subjected to the one step ageing treatments were recognized as the high mechanical strength aluminium alloys (i.e., the tensile strength~550 MPa) in the world. Recently, the A800 (Al-8.9 Zn- 2.1Mg, wt %) aluminium alloys possessing the highest mechanical strength in aluminium alloys (i.e., the tensile strength~784 MPa) have been successedly developed. The newly developed heat treatment (i.e., small/large alternative extrusion cycles) combined with nano-scaled precipitates apparently resulted the higher mechanical strength. Complementary to the electron backscattered diffraction (EBSD) investigation on the grain size distribution, Cs-corrected high-angle annular dark-field scanning transmission electron microscopy (Cscorrected HAADF-STEM) extrapolate the contribution of precipitate evolution on the mechanical properties


PhD student under Prof. Jer-Ren, Yang’s Lab in Department of Materials Science and Engineering, National Taiwan University. The research mainly focus on the exploration and characterization of microstructural evolution of precipitates in Al-Cu-Li and Al-Zn-Mg-Cu series aluminium alloys by highresolution transmission electron microscopy (HRTEM) and Cscorrected high-angle-annular-dark-field scanning-transmissionelectron microscopy (Cs-corrected HRSTEM). Complementary to micrograph analysis, the quantitative measurement in precipitates accompanying with variable ageing treatment has been characterised by small-angle X-ray scattering (SAXS).

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