Effect of Zr on twin roll cast-hot rolled Mg-Zn alloy

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Effect of Initial Texture and Alloying Elements on the Deformation Behavior of Mg Alloys

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Development of Mg Alloys Formable at Room Temperature

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Effect of Al addition on corrosion behavior of high-purity Mg in terms of processing history

In this study, the effects of Al addition on the corrosion behavior of pure Mg with controlled impurity contents were systematically analyzed according to the processing history. The results revealed that the corrosion behavior of high-purity Mg-Al alloys is strongly related to changes in the microstructure, including the β phase and Al-Mn or Al-Fe phases, and the protectiveness of the surface film according to the Al content and processing history. In the as-cast alloys, the corrosion rate increased due to the increase of β phase as the Al content increased, but in the as-extruded alloys, the corrosion rate, which was high due to intermetallic compounds caused by impurities in the low Al alloy, decreased as the Al content increased, and then increased again. This is due to the combined effect of the increase of the β phase and decrease of the impurity effect, and the increase of the dissolved Al content. The results suggest that it is necessary to analyze the effect of alloying elements on the corrosion behavior of pure Mg with information concerning the impurity content and processing history

Improved Formability due to a Change in the Deformation Band of Magnesium Alloy

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Effect of Deformation Twins on Recrystallization Behavior of Magnesium Alloy Sheets

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Structure and properties of twin-roll cast Mg alloy sheets

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Deformation behavior of duplex austenite and epsilon-martensite high-Mn steel

Deformation and work hardening behavior of Fe-17Mn-0.02C steel containing epsilon-martensite within the austenite matrix have been investigated by means of in situ microstructural observations and x-ray diffraction analysis. During deformation, the steel shows the deformation-induced transformation of austenite -> epsilon-martensite -> alpha'-martensite as well as the direct transformation of austenite -> alpha'-martensite. Based on the calculation of changes in the fraction of each constituent phase, we found that the phase transformation of austenite -> epsilon-martensite is more effective in work hardening than that of epsilon-martensite -> alpha'-martensite. Moreover, reverse transformation of epsilon-martensite -> austenite has also been observed during deformation. It originates from the formation of stacking faults within the deformed epsilon-martensite, resulting in the formation of 6H-long periodic ordered structure.open111216sciescopu

Effect of Sn addition on the microstructure and deformation behavior of Mg-3Al alloy

Mg alloys generally suffer from their poor formability at low temperatures due to their strong basal texture and a lack of adequate deformation systems. In the present study, a small amount of Sn was added instead of Zn to Mg-3Al alloy to modify its deformation behavior and improve the stretch formability. Microstructural examinations of the deformed Mg-3Al-1Sn (AT31) alloy by electron back scatter diffraction and transmission electron microscopy show that prismatic slip is quite active during deformation, resulting in much lower r-values and planar anisotropy than the counterpart Mg-3Al-1Zn (AZ31) alloy. Polycrystal plasticity simulation based on visco-plasticity self-consistent (VPSC) model also shows that prismatic slip is the dominant deformation mode in AT31 alloy besides basal slip. As a consequence, AT31 alloy shows a much higher stretch formability than AZ31 alloy. On the other hand, AZ31 alloy shows the development of intense shear bands during stretch forming, and these shear bands act as crack propagating paths, limiting the stretch formability of AZ31 alloy. (c) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.112112sciescopu

Tensile strain-hardening behavior and related deformation mechanisms of pure titanium at cryogenic temperature

The tensile strain-hardening behavior of pure Ti at 100 K was investigated using X-ray diffraction line-profile analysis and plasticity simulation. The strain hardening was significantly increased at 100 K, compared with that observed at 298 K. Thus, at 100 K, necking was suppressed during tensile testing, which greatly increased material ductility. The remarkable increase in strain hardening at 100 K was attributed to the dominant activation of prismatic slip and the exceptionally increased rate of its activation stress with tensile strain at 100 K. This finding significantly advances the understanding of the strain-hardening behavior of pure Ti at low temperatures, and it can also guide the development of texture-engineering strategies to increase the low-temperature ductility of pure Ti