The contribution of long-period stacking-ordered structure (LPSO) to high strength-high ductility combination and nanoscale deformation behavior of magnesium-rare earth alloy

Li, K.; Injeti, V.S.Y.; Misra, R.D.K.; Li, Meng; Zhang, X.G.

doi:10.1016/j.msea.2017.12.056

Cited by 39 publications

(5 citation statements)

References 31 publications

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“…15 µm, which was commonly observed in magnesium alloys after twinning deformation [31]. Greater lanthanum addition led to a refined alloy matrix and therefore effectively hindered the generation and growth of cleavage cracks, due to which the AZ91-1.0La showed the least density of cleavage plane on the fracture surface and the highest elongation among the three AZ91-La alloys [32]. Apart from the normal ductile fracture morphology, we also found two kinds of fractured particles with bright contrast (Figure 8).…”

Section: Fracture Behaviormentioning

confidence: 89%

“…The particles mostly segregated along the grain boundaries and were identified as Zn containing intermetallics (Mg4Zn7 and MgZn2) by EDS analysis. The fracture morphology analysis hinted that fracture initiation sites mainly distributed around these Greater lanthanum addition led to a refined alloy matrix and therefore effectively hindered the generation and growth of cleavage cracks, due to which the AZ91-1.0La showed the least density of cleavage plane on the fracture surface and the highest elongation among the three AZ91-La alloys [32].…”

Section: Fracture Behaviormentioning

confidence: 99%

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The Evolution of Microstructure, Mechanical Properties and Fracture Behavior with Increasing Lanthanum Content in AZ91 Alloy

Tie

Jiang

Guan

et al. 2020

Metals

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AZ91 alloy is a widely applied commercial magnesium alloy due to its good castability, balanced mechanical properties and acceptable price, and lanthanum alloying has been proven to be one of the most effective methods to further improve its mechanical properties. Therefore, we reveal the evolution of microstructure, mechanical properties and fracture behavior with increasing lanthanum content in AZ91 alloy in this study. The magnesium matrix was significantly refined by lanthanum content, and this effect became more evident with increasing addition of lanthanum. The presence of Al3La precipitates significantly reduced the grain mobility and suppressed the formation of Mg17Al12 discontinuous precipitates along the grain boundaries. The rheo-cast alloys exhibited improved and balanced tensile strength and ductility after aging treatment. The fracture type of AZ91-La alloys could be classified as ductile fracture due to the presence of less quasi-cleavage planes and more dimples with a mixture of tear ridges and micropores. Due to the fully refined microstructure and the balanced mechanical properties, the AZ91–1.0La (mass%) alloy presented the greatest potential for industrial applications among the three studied AZ91-La alloys.

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Section: Fracture Behaviormentioning

confidence: 89%

Section: Fracture Behaviormentioning

confidence: 99%

The Evolution of Microstructure, Mechanical Properties and Fracture Behavior with Increasing Lanthanum Content in AZ91 Alloy

Tie

Jiang

Guan

et al. 2020

Metals

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“…Outstanding progress was achieved recently in the engineering of magnesium alloys with a long-period stacking-ordered phase (LPSO-phase): the ultimate tensile strength and ductility of Mg-LPSO alloys were increased to the values ∼600–800 MPa [ 1 , 2 ] and ∼15–20 % and higher [ 2 , 3 ], respectively. However, the LPSO-phase led to the electric potential differences of the order of 60–250 mV between the α-Mg and the LPSO-phase [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

The effect of silica NPs incorporation on protective properties of oxide layers formed by PEO on Mg97Y2Zn1 alloy with LPSO-phase

Krishtal,

Katsman,

Polunin

et al. 2023

Heliyon

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“…However, in fact, there is still controversy over the true contribution of LPSO phases when it comes to the mechanical properties of experimental alloys. Although some studies [22][23][24][25] have attributed their high plasticity to a combination effect such as that of fine grains and LPSO phase deformation, there are still studies [20,26] proposing that LPSO phases destroy the plasticity of alloys while strengthening them with fiber reinforcement. The main reason for this controversy is that the excellent mechanical properties of the alloys are usually the result of a combination of factors such as grain size, texture, LPSO phases, and other precipitations.…”

Section: Introductionmentioning

confidence: 99%

Effects of Bulk LPSO Phases on Mechanical Properties and Fracture Behavior of As-Extruded Mg-Gd-Y-Zn-Zr Alloys

Chen,

Li,

Sun

et al. 2023

Materials

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Despite the consensus on the constructive effect of LPSO (long-period stacking-ordered) phases, the true effect of bulk LPSO phases on strengthening and toughening in deformed magnesium alloys is still controversial. This article, which introduces the alloys Mg-8Gd-4Y-0.6Zn-0.5Zr, without bulk LPSO phases, and Mg-8Gd-4Y-1.6Zn-0.5Zr, containing bulk LPSO phases, details a systematically comparative analysis conducted to clarify the true contribution of bulk LPSO phases to the properties of as-extruded alloys. The results indicate that bulk LPSO phases significantly improve strength by refining grain sizes remarkably. But contrary to expectations, bulk LPSO phases themselves only provide a small strengthening effect and deteriorate plasticity, ascribed to the poor compatible plastic deformation of bulk LPSO phases. More importantly, this work may offer new insights into the strengthening and toughening of LPSO phases for further research and engineering applications of this series of alloys. Additionally, an example of a design strategy for Mg-Gd-Y-Zn alloys with superior strength and excellent plasticity is proposed at the end of this article.

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The contribution of long-period stacking-ordered structure (LPSO) to high strength-high ductility combination and nanoscale deformation behavior of magnesium-rare earth alloy

Cited by 39 publications

References 31 publications

The Evolution of Microstructure, Mechanical Properties and Fracture Behavior with Increasing Lanthanum Content in AZ91 Alloy

The Evolution of Microstructure, Mechanical Properties and Fracture Behavior with Increasing Lanthanum Content in AZ91 Alloy

The effect of silica NPs incorporation on protective properties of oxide layers formed by PEO on Mg97Y2Zn1 alloy with LPSO-phase

Effects of Bulk LPSO Phases on Mechanical Properties and Fracture Behavior of As-Extruded Mg-Gd-Y-Zn-Zr Alloys

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