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- 저자 : Manfa Yuan (검색결과 2 건)
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Manfa Yuan,Yunlai Deng,Sen Lin,Xiaobin Guo,Yuankang Xie 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
In this work, Al–Mg–Si/Al–Zn–Mg laminated composite sheets were successfully produced first time by combining AA6082and AA7204 sheets through the cross accumulative roll bonding process. Two different starting materials were rolling bondedas alternate layers up to 8 rolling cycles with 408 °C pre-heating for 20 min before each cycle. In-situ corrosive surface wascharacterized by the electron backscattered diffraction to study the relationship between the grain orientation and the corrosionbehavior of Al–Mg–Si/Al–Zn–Mg composite sheets. 78.2% of the volume fraction of S-type ({123} <634>) texture,46.0% of R-Cubic-type ({001} <110>) texture and 18.8% of Brass-type ({110} <112>) texture reduced during in situ corrosivetests. Corrosion results indicated that the excellent corrosion resistance mainly contributed from grains near Brass-typetexture ({110} <112>). As the volume fraction of the Brass-type ({110} <112>) texture distributed in the Al–Zn–Mg alloyaround the interface increased from 0.18 to 4.16% with the rolling reduction increased from 93.7 to 99.2%, the corrosionresistance of the laminated rolling material improved.
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Manfa Yuan,Jin Zhang,Yunlai Deng,Xiaobin Guo,Liqun Guan 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.5
Noteworthy ductility Mg-8Gd-4Y-1Nd-0.5Si (wt.%) alloy with a strong non-basal texture was developed by 12 passes ofmulti-directional forging (MDF) combine with extrusion. The slip trace analysis indicated that deformation mechanism after3 passes of MDF and extrusion were basal < a > , pyramidal < a > and pyramidal < c + a > slips. The intensity of non-basaltexture increased from 5.37 to 8.03 with the MDF passes increased from 3 to 12, which means grain orientation tends tobe more consistent and makes the basal < a > slips easy to pass through grain boundaries to accommodate ductility. Withmore basal < a > slips crossing the grain boundaries, dislocation interaction in grain interior caused stress accumulation,exceeding the critical shear stress (CRSS) of slips with low schmidt factor (SF), and multiple slips appeared. The activationof slip cross grain boundary and multiple slip improved the elongation from 14.7% to 25.6% of MDFs-extruded Mg-8Gd-4Y-1Nd-0.5Si alloy.
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