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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.
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Study on the Evolution Law of Sandstone Porosity under Soaking-Drying Cycles
Zuosen Luo,Zuoxiang Zhu,Qiao Jiang,Xiaoliang Xu,Daxiang Liu,Meiling Zhou 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.1
In view of the problem whereby the rock masses in water-level fluctuation zones of reservoir banks are susceptible to deterioration due to soaking-drying cycles, the sandstone of a typical landslide in the Three Gorges Reservoir area is selected as the test object to determine the ion concentration of an immersion solution and rock sample via periodic water-rock microscopic images, quantitative back analysis of the porosity changes caused by the dissolution of rock minerals under soaking-drying cycles, and evaluation of the sandstone porosity evolution. The results show that, 1) in the first two soaking-drying cycles, the generation rate of each ion is relatively high, and after 6 soaking-drying cycles, the ion generation rate tends to remain stable. 2) The volume reduction in calcite is the largest, followed by that in albite and potash feldspar. 3) Small porosity changes result in a considerable decrease in the compressive strength. 4) Sandstone porosity increase leads to an increase in rock pores, which is manifested as a deterioration of the macroscopic rock mechanical properties. Relevant research results could provide a reliable data basis for the study of large-scale reservoir bank slope protection and geological disaster evaluation and prediction.
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