Structural characteristics of β1′ precipitates in Mg–Zn-based alloys

Singh, Alok; Tsai, An‐Pang

doi:10.1016/j.scriptamat.2007.07.028

Cited by 81 publications

(50 citation statements)

References 5 publications

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“…The proposed crystal structure and the orientation relationship are subsequently confirmed in separate studies on precipitates in Mg-Zn-Y alloys. [66][67][68] In these latest electron microscopy studies, it is revealed that the Mg 4 Zn 7 phase has a complex substructure and planar defects elongated along the long axis of b 0 1 rods ( Figure 5(d)). In a very recent study, [69] it was reported that the b .…”

Section: Phase Equilibria and Precipitationmentioning

confidence: 96%

Precipitation and Hardening in Magnesium Alloys

Nie

2012

Metall Mater Trans A

1,351

519

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Magnesium alloys have received an increasing interest in the past 12 years for potential applications in the automotive, aircraft, aerospace, and electronic industries. Many of these alloys are strong because of solid-state precipitates that are produced by an age-hardening process. Although some strength improvements of existing magnesium alloys have been made and some novel alloys with improved strength have been developed, the strength level that has been achieved so far is still substantially lower than that obtained in counterpart aluminum alloys. Further improvements in the alloy strength require a better understanding of the structure, morphology, orientation of precipitates, effects of precipitate morphology, and orientation on the strengthening and microstructural factors that are important in controlling the nucleation and growth of these precipitates. In this review, precipitation in most precipitation-hardenable magnesium alloys is reviewed, and its relationship with strengthening is examined. It is demonstrated that the precipitation phenomena in these alloys, especially in the very early stage of the precipitation process, are still far from being well understood, and many fundamental issues remain unsolved even after some extensive and concerted efforts made in the past 12 years. The challenges associated with precipitation hardening and age hardening are identified and discussed, and guidelines are outlined for the rational design and development of higher strength, and ultimately ultrahigh strength, magnesium alloys via precipitation hardening.

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Section: Phase Equilibria and Precipitationmentioning

confidence: 96%

Precipitation and Hardening in Magnesium Alloys

Nie

2012

Metall Mater Trans A

1,351

519

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“…The β 1 precipitate is not an equilibrium phase but rather a transition phase that can be designed as MgZn , which is the main strengthening phase in the Mg-Zn alloys. Transition from β 1 to β 2 coincides with the onset of over-ageing [14]. The β 2 precipitate that forms during over-ageing is the equilibrium MgZn phase.…”

Section: Microstructurementioning

confidence: 96%

“…[14]. Moreover, they are about several hundreds of nanometers long, 10-20 nm in thickness and with a large aspect ratio of 20 or higher.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructural characterization and mechanical properties of a Mg–6Zn–3Sn–2Al alloy

Chen

Yan

et al. 2009

Journal of Alloys and Compounds

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“…The quasicrystalline phase particle has a strong and matching interface with the matrix, i.e., a coherent interface, on all sides. 18,32) On the contrary, some parts of the interface are incoherent in the precipitates 33) and the W-phase. 34) The dislocation movement is easily interrupted, as does a conventional second-phase particle, regardless of the interface structures.…”

Section: )mentioning

confidence: 99%

High Strength and Fracture Toughness Balances in Extruded Mg-Zn-RE Alloys by Dispersion of Quasicrystalline Phase Particles

et al. 2008

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Six kinds of Mg-2.5 at%Zn-0.5 at%RE (RE: rare earth element, Y, Gd, Tb, Dy, Ho and Er) alloys with grain size of 1$2 mm and containing a quasicrystalline icosahedral phase were prepared by casting and extrusion. These alloys had high strength and high fracture toughness balances, due to the synergetic effect of grain refinement and the dispersion of quasicrystalline phase particles. Microstructural observations showed a ductile fracture pattern, and that the origin of void nucleation was not the quasicrystalline phase particles but the conventional precipitates and the W-phase particles, because of the difference in the interface structure between the matrix and the particles.

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Structural characteristics of β1′ precipitates in Mg–Zn-based alloys

Cited by 81 publications

References 5 publications

Precipitation and Hardening in Magnesium Alloys

Precipitation and Hardening in Magnesium Alloys

Microstructural characterization and mechanical properties of a Mg–6Zn–3Sn–2Al alloy

High Strength and Fracture Toughness Balances in Extruded Mg-Zn-RE Alloys by Dispersion of Quasicrystalline Phase Particles

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