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Lingying Ye,Yu Dong,Shengdan Liu,Haichun Jiang,Daxiang Sun,Xinming Zhang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5
The effects of pre-ageing on the microstructure and mechanical properties of T9I6 treated 2519A aluminium alloy wereinvestigated by hardness testing, tensile testing, transmission electron microscope, high resolution transmission electronmicroscope and differential scanning calorimetry. With the increase of pre-ageing time from 40 min to 4 h, the strength tendsto increase fi rst and then decrease; the pre-ageing time of 80 min results in the highest 0.2% proof strength and ultimatetensile strength of 491.9 and 513.8 MPa, respectively, and a high elongation of 14.6%. Pre-ageing is favorable for the formationof a number of primary GP zones, which can greatly improve the distribution of dislocations introduced by subsequentpre-deformation and secondary GP zones introduced by subsequent interrupted ageing. As a result, the number of precursorsfor θ′ hardening precipitates is maximized and the mechanical properties is improved after fi nal re-ageing.