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

Zhang, S.; Lü, Chen; Ding, Wei

doi:10.1002/9781118062029.ch30

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…Depending on Zn/Gd ratio, basically three ternary equilibrium phases emerge in the cast Mg-Zn-Gd alloys, namely W-Mg3Gd2Zn3 phase, X-Mg12GdZn phase and I-Mg3Zn6Gd phase [37]. Although the strengthening and toughening mechanisms of several Mg-Zn-Gd alloys with X-phase or I-phase have been widely carried out, the available information concerning their corrosion properties and mechanism is incomplete.…”

Section: Introductionmentioning

confidence: 99%

Improving the corrosion resistance of MgZn1.2Gd Zr0.18 (x = 0, 0.8, 1.4, 2.0) alloys via Gd additions

et al. 2020

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Effects of Gd addition on microstructure, corrosion behavior and mechanism of cast and extruded MgZn1.2GdxZr0.18 alloys are investigated through microstructure observation, weight loss and electrochemical tests. Increasing Gd from 0 to 2.0 at.%, grains are refined, MgZn2 phase, W-phase and X-phase are formed successively, and basal texture intensity is decreased. The significantly decreased grain size by extrusion and Gd addition induces formation of protective Gd2O3 and MgO layer. The extruded MgZn1.2Gd2.0Zr0.18 alloy shows decreased corrosion rate of 3.72 ± 0.36 mm/year, owing to fine and homogeneous microstructure, dual-role (micro-anode and barrier) of Xphase, compact oxidation layer and basal crystallographic texture.

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Section: Introductionmentioning

confidence: 99%

Improving the corrosion resistance of MgZn1.2Gd Zr0.18 (x = 0, 0.8, 1.4, 2.0) alloys via Gd additions

et al. 2020

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“…have been developed and their microstructure and properties investigated. Among these systems, Mg-Gd-Zn is one of the very important systems as its microstructure consists of many different phases, such as I, W, Z and laves phases, depending upon the ratio of Zn and Gd contents, thus resulting in different mechanical behaviours [2]. In the present study, microstructure, mechanical and corrosion properties of Mg-10Gd-2Zn and Mg-10Gd-6Zn were evaluated in the ascast condition, and the properties were correlated with their microstructures.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Mechanical and Corrosion Properties of Mg-Gd-Zn Alloys

Srinivasan

Huang

Mendis

et al. 2013

MSF

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Microstructure, mechanical and corrosion properties of Mg-10Gd-2Zn and Mg-10Gd-6Zn (all in wt.%) were evaluated in the as-cast condition. The microstructures of both alloys contained (Mg, Zn)3Gd phase at the interdendritic regions and long period stacking ordered (LPSO) phase distributed in the matrix. The Mg-10Gd-6Zn alloy consisted of a high volume fraction of (Mg,Zn)3Gd intermetallic phases continuously distributed along the grain boundaries. The tensile properties, especially the elongation to failure of the Mg-10Gd-6Zn alloy were slightly lower than those of Mg-10Gd-2Zn. An enhancement in creep resistance was observed with Mg-10Gd-2Zn alloy with the post creep tested microstructure showing dynamic precipitation. Corrosion studies indicated that increased Zn content, from 2 to 6 % in Mg-10Gd alloys, significantly reduced the corrosion resistance.

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“…Many experimental alloys based on Mg-Gd-Y, Mg-Gd-Y-Nd, Mg-Gd-Zn, and Mg-Gd-Y-Zn systems have been developed, and their microstructure and mechanical properties are investigated [7][8][9][10][11][12]. Among these systems, Mg-Gd-Zn is one of the interesting systems as its microstructure consists of different phases, such as I, W, Z and laves phases, depending on the ratio of Zn and Gd resulting in different mechanical behavior [13,14]. Thus, the mechanical properties of these alloys can be tailored accordingly by altering the Zn and Gd contents.…”

mentioning

confidence: 99%

Creep behavior of Mg–10Gd–xZn (x=2 and 6 wt%) alloys

Srinivasan

Dieringa

Mendis

et al. 2016

Materials Science and Engineering: A

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Creep behavior of Mg-10Gd-xZn alloys was investigated with two Zn contents, 2 and 6 wt%. The as cast microstructure of alloys contained (Mg, Zn)3Gd phase at the interdendritic regions and long period stacking ordered (LPSO) phase in the matrix. Increase in the Zn content from 2% to 6%, increased the volume fraction and morphology of second phase [(Mg,Zn) 3 Gd]. Creep testing at 250 and 300 • C with stress levels between 50 and 120 MPa indicated that increase in Zn content or temperature reduced the creep performance of the Mg-10Gd-xZn alloys. The minimum creep rate of Mg-10Gd-2Zn was one order less that of Mg-10Gd-6Zn. Dynamic precipitation was found in both the alloys during creep deformation at 250 • C and strengthened the alloys: prismatic platelets (Mg 5 Gd) were observed perpendicular to the LPSO phase in Mg-10Gd-2Zn alloy whereas basal oval precipitates (ternary composition) parallel to the LPSO occurred in Mg-10Gd-6Zn alloy. The dynamic precipitates were not observed in alloys during creep at 300 • C. Ternary bulk precipitates at the LPSO phase was observed in both alloys and at all testing conditions which facilitated the cracking during deformation. More continuous second phase at the interdendritic boundaries facilitated easy cracking in Mg-10Gd-6Zn alloy and hence reduced the creep performance.

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

Cited by 3 publications

References 13 publications

Improving the corrosion resistance of MgZn1.2Gd Zr0.18 (x = 0, 0.8, 1.4, 2.0) alloys via Gd additions

Improving the corrosion resistance of MgZn1.2Gd Zr0.18 (x = 0, 0.8, 1.4, 2.0) alloys via Gd additions

Microstructure, Mechanical and Corrosion Properties of Mg-Gd-Zn Alloys

Creep behavior of Mg–10Gd–xZn (x=2 and 6 wt%) alloys

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