The microstructure evolution with lamellar 14H-type LPSO structure in an Mg96.5Gd2.5Zn1 alloy during solid solution heat treatment at 773K

Wu, Yujuan; Zeng, Xiaoqin; Lin, Dongliang; Peng, Liming; Ding, Wenjiang

doi:10.1016/j.jallcom.2008.10.126

Cited by 142 publications

(43 citation statements)

References 19 publications

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“…According to the XRD patterns (Fig. 2) of the alloys A and C, the eutectic phases are confirmed as (Mg,Zn) 3 Gd phases, which is consistent with previous studies [4,5] . The morphologies of α-Mg grains and eutectic phases of the alloys change with different Li content.…”

Section: Methodssupporting

confidence: 91%

“…Based on the analyses mentioned above and the XRD peaks in Fig. 2, both the coarse continuous phase and lamellar phase were identified as 14H-LPSO structure phases, which were in agreement with previous investigations [4][5] . With the addition of Li, the microstructure of solid-solution treated MgGd 3 Zn 1 alloy changed significantly.…”

Section: Microstructures Of As-cast Alloys a B C And Dsupporting

confidence: 90%

“…That is to say the composition of the residual liquid reaches the point B where (Mg,Zn) 3 Gd phases crystallize first. Therefore, during the subsequent cooling and solidification, (Mg,Zn) 3 Gd rather than (Mg,Zn) 5 Gd phases crystallize until the end of the solidification. The microstructures at higher magnification are shown in Fig.…”

Section: Microstructures Of As-cast Alloys a B C And Dmentioning

confidence: 99%

“…Nevertheless, as a kind of second phase, the coarse block-like LPSO phase usually precipitates at grain boundaries during traditional solidification or subsequent solid solution treatment [4][5] , which was reported to cause a decrease in strength [6][7] . Recently, various processes, such as extrusion [8][9] , friction stir processing (FSP) [10][11] and severe plastic deformation [12][13] , have been applied to achieve refined microstructure and enhanced mechanical properties.…”

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Effect of Li on formation of long period stacking ordered phases and mechanical properties of Mg-Gd-Zn alloy

et al. 2016

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M g-Re-Zn alloys have attracted increasing attention due to their superior mechanical properties, attributing to the formation of lamellar long period stacking ordered (LPSO) phases within an α-Mg matrix [1][2][3] . Nevertheless, as a kind of second phase, the coarse block-like LPSO phase usually precipitates at grain boundaries during traditional solidification or subsequent solid solution treatment [4][5] , which was reported to cause a decrease in strength [6][7] . Recently, various processes, such as extrusion [8][9] , friction stir processing (FSP) [10][11] and severe plastic deformation [12][13] , have been applied to achieve refined microstructure and enhanced mechanical properties. However, the coarse LPSO phase with excellent plasticity is hard to be broken. What's worse, all these methods will raise the production cost. Hence, there is a great importance to develop an effective and simple technology to decrease the detrimental influence of the coarse second phase.Alloying treatment is a simple and economical method to improve the properties of alloys. To further improve the Abstract: Alloys with composition of Mg 96-x Gd 3 Zn 1 Li x (at.%) (x=0, 2, 4, and 6) were prepared by conventional casting. The microstructures of these alloys under as-cast and solid-solution conditions have been observed, and the mechanical properties were investigated. The results showed that Li is an effective element to refine the grains and break the eutectic networks in as-cast MgGd 3 Zn 1 alloy. During solid solution treatment, these broken eutectic networks are spheroidized and highly dispersed. In addition, plentiful lamellar long period stacking ordered (LPSO) phases are precipitated in an α-Mg matrix when the Li addition is not more than 4%. Solid-solution treated Mg 92 Gd 3 Zn 1 Li 4 alloy exhibits an optimal ultimate tensile strength (UTS) of 226 MPa and elongation of 5.8%. The strength of MgGd 3 Zn 1 alloy is improved significantly, meanwhile, the toughness is apparently increased. properties, heat treatment is usually adopted following the alloying treatment, which gives another simple and effective property improving method. Therefore, a proper combination of alloying and heat treatment is needed to obtain optimal mechanical properties. It has been demonstrated that Mn, Sr and Li are effective elements to modify the size and morphology of the second phases in cast aluminum alloys [14][15][16] . After heat treatment, the modified A380 aluminum alloy shows a significant improvement in tensile properties [17] . The method and principle of alloying and heat treatment for magnesium and aluminum alloys are similar. So, is it possible that the addition of these elements could modify the eutectic networks of as-cast Mg-Re-Zn alloy or turn the coarse second phase into less harmful forms during the following heat treatment? Furthermore, the addition of Li can decrease the lattice constant ratios (c/a) through the substitution of Mg atoms by Li atoms, which will improve the ductility [18][19][20] . The reduction of the atomic...

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Section: Methodssupporting

confidence: 91%

Section: Microstructures Of As-cast Alloys a B C And Dsupporting

confidence: 90%

Section: Microstructures Of As-cast Alloys a B C And Dmentioning

confidence: 99%

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Effect of Li on formation of long period stacking ordered phases and mechanical properties of Mg-Gd-Zn alloy

et al. 2016

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“…It is known that the Mg 12 ZnY LPSO phase exhibits several different crystal structures characterized by changing the stacking sequence of the closepacked (0001) plane and by the peculiar chemical modulation of the Zn and Y atoms on the close-packed plane; such a structure is called a "synchronized LPSO structure" 26) . In this paper, operative non-basal slip in the Mg 12 ZnY phase with the synchronized LPSO structure is described first, and then its variation depending on the crystal structure is discussed.…”

Section: Introductionmentioning

confidence: 99%

Non-Basal Slip Systems Operative in Mg<sub>12</sub>ZnY Long-Period Stacking Ordered (LPSO) Phase with 18R and 14H Structures

et al. 2013

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Non-basal slip systems in the Mg 12 ZnY long-period stacking ordered (LPSO) phase, the operational frequency of which is increased at high-temperatures and affects the mechanical properties, were clarified. The f1 100gh11 20i prism slip was identified in both 18R and 14H LPSO phases, even though they have the different lattice systems. This behavior is different from that observed in a Ni-based LPSO phase. The peculiar chemical modulation in the Mg 12 ZnY LPSO phase may affect the selection of operative slip systems.

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Effect of Zn/Gd Ratio on Phase Constitutions in Mg‐Zn‐Gd Alloys

Zhang¹,

Lü²,

Ding³

2011

Magnesium Technology 2011

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The microstructure evolution with lamellar 14H-type LPSO structure in an Mg96.5Gd2.5Zn1 alloy during solid solution heat treatment at 773K

Cited by 142 publications

References 19 publications

Effect of Li on formation of long period stacking ordered phases and mechanical properties of Mg-Gd-Zn alloy

Effect of Li on formation of long period stacking ordered phases and mechanical properties of Mg-Gd-Zn alloy

Non-Basal Slip Systems Operative in Mg<sub>12</sub>ZnY Long-Period Stacking Ordered (LPSO) Phase with 18R and 14H Structures

Effect of Zn/Gd Ratio on Phase Constitutions in Mg‐Zn‐Gd Alloys

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