Recent developments on corrosion behaviors of Mg alloys with stacking fault or long period stacking ordered structures

This review presents an overview of the recent developments in the synthesis of layered double hydroxide (LDH) on the anodized films of Mg alloys prepared by either conventional anodizing or plasma electrolytic oxidation (PEO) and the applications of the formed composite ceramics as smart chloride traps in corrosive environments. In this work, the main fabrication approaches including co-precipitation, in situ hydrothermal, and an anion exchange reaction are outlined. The unique structure of LDH nanocontainers enables them to intercalate several corrosion inhibitors and release them when required under the action of corrosion-relevant triggers. The influences of different variables, such as type of cations, the concentration of salts, pH, and temperature, immersion time during the formation of LDH/anodic film composites, on the electrochemical response are also highlighted. The correlation between the dissolution rate of PEO coating and the growth rate of the LDH film was discussed. The challenges and future development strategies of LDH/anodic films are also highlighted in terms of industrial applications of these materials.

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Achieving ultra-strong Mg alloys via a novel hierarchical long-period stacking ordered architecture

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2021.159343 ◽

2021 ◽

Vol 870 ◽

pp. 159343

Author(s):

Shuaijun Ding ◽

Xuecheng Cai ◽

Zhongjie Li ◽

Lidong Xu ◽

Kangkang Wen ◽

...

Keyword(s):

Mg Alloys ◽

Long Period

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Document supply and resource sharing in Portuguese libraries: the role of the National Library

Interlending & Document Supply ◽

10.1108/02641611011025343 ◽

2010 ◽

Vol 38 (1) ◽

pp. 31-36 ◽

Cited By ~ 4

Author(s):

Elisa Maria Gaudêncio Soares

Keyword(s):

Information Technology ◽

Resource Sharing ◽

Design Methodology ◽

Public Library ◽

Supply System ◽

National Library ◽

Content Type ◽

Long Period ◽

Recent Developments

PurposeThe purpose of the paper is to describe the development of the Portuguese document supply system with particular emphasis on the role of the National Library but also in its academic and public library sectors.Design/methodology/approachThe paper is descriptive in nature.FindingsPortugal emerged from a long period of monarchy and dictatorship, profited from being a EU member, and libraries are now exploiting the advantages of information technology particularly for the benefit of remote users.Originality/valueThis is probably the first overview of historical and recent developments in document supply in Portugal.

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On the room temperature deformation mechanisms of a Mg–Y–Zn alloy with long-period-stacking-ordered structures

Acta Materialia ◽

10.1016/j.actamat.2014.09.036 ◽

2015 ◽

Vol 82 ◽

pp. 414-423 ◽

Cited By ~ 97

Author(s):

Jin-Kyung Kim ◽

Stefanie Sandlöbes ◽

Dierk Raabe

Keyword(s):

Room Temperature ◽

Deformation Mechanisms ◽

Temperature Deformation ◽

Ordered Structures ◽

Long Period ◽

Zn Alloy

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Effect of Long-Period Stacking Order Phase and α-Mg Phase on Strength and Ductility of Mg-Zn-Y Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.706-709.1237 ◽

2012 ◽

Vol 706-709 ◽

pp. 1237-1242 ◽

Cited By ~ 1

Author(s):

Masafumi Noda ◽

Yoshihito Kawamura

Keyword(s):

Mechanical Properties ◽

Yield Strength ◽

High Temperatures ◽

Mg Alloys ◽

Tensile Yield Strength ◽

Block Type ◽

Lpso Phase ◽

Long Period ◽

Stacking Order ◽

Type Phase

Mg alloys are lightweight structural alloys that normally have a good castability and machinability as well as an excellent specific strength and rigidity. However, the mechanical properties of Mg alloys are inferior to those of Al alloys, and their range of industrial applications is limited. Recently, Mg–Zn–Y alloy has been found to show a high tensile yield strength with a good elongation. The alloy has a long-period stacking order (LPSO) phase as the secondary phase in an α-Mg phase. In general, the tensile yield strengths of LPSO-type Mg alloy are known to be markedly enhanced by the formation of kink bands in the LPSO phase and by microstructural refinement of the α-Mg phase during plastic deformation. The separate roles of the LPSO phase and the α-Mg phase in relation to the mechanical properties of high-strength LPSO-type Mg alloy were investigated at ambient and high temperatures. For high strengths at ambient and high temperatures, it was important that the α-Mg phase consisted of a fine-grain region and a nonrecrystallized region, and that the LPSO phase remained as a block-type phase. On the other hands, it was necessary to change the LPSO phase from a block-type phase into a plate-type phase by heat treatment before tensile testing to improve the ductility of the alloy while maintaining its tensile yield strength. Microstructural control of the LPSO phase and the α-Mg phase is necessary to obtained Mg–Zn–Y alloy with superior mechanical properties at ambient-to-high temperatures.

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