Theoretical investigation of typical fcc precipitates in Mg-based alloys

Tang, Bi‐Yu; Wang, Na; Yu, Weiyang; Zeng, Xiaoqin; Ding, Wenjiang

doi:10.1016/j.actamat.2008.03.014

Cited by 46 publications

(19 citation statements)

References 31 publications

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“…The obtained results of the zero pressure bulk modulus B 0 and the pressure derivation B 0 are 40.3 GPa and 4.55, respectively. For the fcc Mg 3 Gd, the calculated bulk modulus B 0 is 40.7 GPa [16], which is close to the present result of ␤ phase Mg 3 Gd. The results of EOS fit also prove the validity of the present calculation.…”

Section: Structural Parameters and Stabilitysupporting

confidence: 90%

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First-principles investigation of the structural and mechanical properties of β″ phase in Mg–Gd alloy system

Tang

Chen

et al. 2010

Journal of Alloys and Compounds

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Section: Structural Parameters and Stabilitysupporting

confidence: 90%

“…It is shown that the mechanical properties of Mg alloys could be improved remarkably by the addition of rare earth metal [3]. Therefore, Mg-rare earth alloys have received great interest from both the experiment and theory [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

First-principles investigation of the structural and mechanical properties of β″ phase in Mg–Gd alloy system

Tang

Chen

et al. 2010

Journal of Alloys and Compounds

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“…The brittle of Mg-RE compounds has also been reported in the past, e.g. Ganeshan et al [31] and Tang et al [27] have reported the brittle characteristics of Mg 2 Y, Mg 3 La, and Mg 3 Gd.…”

Section: Resultsmentioning

confidence: 85%

“…The calculated Poisson's ratio of β′-Mg 7 Gd is 0.21, suggesting that β′-Mg 7 Gd is a material with predominantly central interatomic forces [27]. Table 3 indicates that the β′-Mg 7 Gd precipitate possesses a higher elastic stiffness than the surrounding α-Mg matrix, which contributes to the precipitation strengthening.…”

Section: Resultsmentioning

confidence: 97%

First-principles calculations of the β′-Mg7Gd precipitate in Mg-Gd binary alloys

et al. 2011

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The metastable β′ phase is often the most effective hardening precipitate in Mg-Gd based alloys. In this paper, the structural, elastic and electronic properties of the recently identified β′-Mg 7 Gd precipitate in Mg-Gd binary alloys were investigated using first-principles calculations based on density functional theory. The lattice mismatches between the coherent β′-Mg 7 Gd precipitate and α-Mg matrix are discussed and used to rationalize the experimentally observed morphology of the precipitate. The mechanical properties were investigated through analysis of the single-crystal elastic constants and the polycrystalline elastic moduli. It is found that β′-Mg 7 Gd is brittle in nature. Strong covalent bonding in β′-Mg 7 Gd, as inferred from its electronic structure, further explains its mechanical properties. Our theoretical results show good agreement with experimental measurements. precipitates, electronic structure, elastic properties, first-principles calculations Citation: Gao L, Zhou J, Sun Z M, et al. First-principles calculations of the β′-Mg 7 Gd precipitate in Mg-Gd binary alloys.

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“…Of the many techniques used for achieving UFG microstructures, such as equal channel angular extrusion (ECAE) [6], friction stir processing(FSP) [7], accumulative roll bonding (ARB) [8], high-pressure torsion (HPT) [9] and powder metallurgy (PM) [10], PM was an effective technique to synthesize high strength UFG Mg alloys [11][12][13][14][15]. A UFG structure is more easily achieved in precipitate-hardened Mg alloys or Mg-based composites due to the effective pining effect from the precipitates or added ceramic particles on the grain boundaries [16][17][18][19]. For pure Mg or solute-solution hardened Mg alloys (such as AZ31) with a low content of alloying elements, it is difficult to achieve a UFG microstructure due to the rapid growth kinetics of the singlephase grains.…”

Section: Introductionmentioning

confidence: 99%

Effect of ball milling time on nanocrystalline powders and bulk ultrafine-grained Mg-3Al-Zn alloy

Feng

Sun

Fang

2015

MATEC Web of Conferences

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Abstract. Bulk ultrafine-grained Mg-3Al-Zn alloy has been made of elemental powders by mechanical milling, vacuum hot pressing and warm extrusion sequentially. As the only variable, ball milling time was 20 h, 40 h, 60 h and 80 h, respectively. Microstructural studies and mechanical strength were characterized by SEM, XRD, TEM and tensile tests. At 60 h, the particle size of the milled powders decreased to 10 m. With extension of time, the grain sizes of nanocrystalline powders were 41, 39.5, 38.5 and 38 nm. Under the same hot pressing and extrusion conditions, the grain sizes of extruded materials were 600, 565, 555 and 550 nm, respectively. The results of tensile tests showed that increasing milling time under 60 h improved the strength of the extruded alloys, however, reduced the ductility due to lower relative density and more defects. This also indicated that better ductility with high strength should be obtained if densification process was further improved. Meanwhile, the high ultimate strength of 419 MPa results from oxide dispersion strengthening and dislocation strengthening besides grain refinement strengthening.

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Theoretical investigation of typical fcc precipitates in Mg-based alloys

Cited by 46 publications

References 31 publications

First-principles investigation of the structural and mechanical properties of β″ phase in Mg–Gd alloy system

First-principles investigation of the structural and mechanical properties of β″ phase in Mg–Gd alloy system

First-principles calculations of the β′-Mg7Gd precipitate in Mg-Gd binary alloys

Effect of ball milling time on nanocrystalline powders and bulk ultrafine-grained Mg-3Al-Zn alloy

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