Improvement of mechanical behaviors of a superlight Mg-Li base alloy by duplex phases and fine precipitates

Zou, Yun; Zhang, Lehao; Li, Yang; Wang, Hongtao; Liu, Jiabin; Liaw, Peter K.; Bei, Hongbin; Zhang, Zhongwu

doi:10.1016/j.jallcom.2017.12.025

Cited by 88 publications

(25 citation statements)

References 39 publications

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“…Research [ 47 ] showed that, at 135 kJ/mol, the lattice self-diffusion activation energy of magnesium takes place, and, at the 92 kJ/mol grain boundary, diffusion activation energy takes place. In the presented work, with the addition of Li as an alloying element, the axial ratio (c/a) decreased, causing an increase in the activity of the non-basal slips and a reduction in activation energy Q [ 48 , 49 ].…”

Section: Resultsmentioning

confidence: 99%

Hot Deformation Treatment of Grain-Modified Mg–Li Alloy

et al. 2020

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In this work, a systematic analysis of the hot deformation mechanism and a microstructure characterization of an as-cast single α-phase Mg–4.5 Li–1.5 Al alloy modified with 0.2% TiB addition, as a grain refiner, is presented. The optimized constitutive model and hot working terms of the Mg–Li alloy were also determined. The hot compression procedure of the Mg–4.5 Li–1.5 Al + 0.2 TiB alloy was performed using a DIL 805 A/D dilatometer at deformation temperatures from 250 °C to 400 °C and with strain rates of 0.01–1 s−1. The processing map adapted from a dynamic material model (DMM) of the as-cast alloy was developed through the superposition of the established instability map and power dissipation map. By considering the processing maps and microstructure characteristics, the processing window for the Mg–Li alloy were determined to be at the deformation temperature of 590 K–670 K and with a strain rate range of 0.01–0.02 s−1.

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Section: Resultsmentioning

confidence: 99%

Hot Deformation Treatment of Grain-Modified Mg–Li Alloy

et al. 2020

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“…As reported by many researches [26,48], texture also greatly influences the strength and ductility of the Mg alloys. As revealed in the XRD patterns of the alloys, the (101 0), (101 1), and (112 0) peaks of the ECAPed alloys were strengthened.…”

Section: Texture Strengtheningmentioning

confidence: 92%

“…For the Mg-9Li alloy, due to the bcc structure and its softer essence of β-Li phase, it will be firstly deformed with lots of dislocations accumulated in the α/β phase interface, which inhibits the recovery of the β-Li phase but stores up enormous distortion energy [39]. With increase in ECAP passes and induced strain, a large number of dislocations will concentrate inside the deformed β-Li phase grains [26,40]. The increase in dislocation density leads to the sub-grain boundary becoming the nucleation point of recrystallization, eventually growing up to from new grains [18,41].…”

Section: Grain-boundary Strengthening and Dislocation Strengtheningmentioning

confidence: 99%

“…This makes it easy to induce stresses when rolling at large strain rates which results in very low yield of magnesium alloy sheets [25]. However, the addition of lithium to the magnesium alloy forming Mg-Li alloy results in the formation of a β-rich Li phase which greatly increases the dislocation slip system and improves the plastic deformation ability of the Mg-Li alloys [26]. The results obtained from the reported research [27,28] show that, the use of rolling technique leads to an improvement in the strength properties of the Mg-Li alloy, activate more slip systems, enhance the ability of intergranular co-opening and improve the ability of plastic deformation at room temperature (RT).…”

Section: Introductionmentioning

confidence: 99%

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Development of a High Strength Mg-9Li Alloy via Multi-Pass ECAP and Post-Rolling

Klu

Song

et al. 2019

Metals

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In this study, a high-strength Mg-9Li alloy was developed via multi-pass equal-channel-angular-pressing (ECAP) and post rolling, of which the yield tensile stress (YTS) and ultimate tensile stress (UTS) were 166 MPa and 174 MPa representing about 219% and 70% increase in YTS and UTS respectively, compared to the cast alloy. The cast alloy was ECAP processed at 200 °C for 4, 8, and 16 passes, followed by room-temperature rolling to a total thickness reduction of 50%. The 8-passes ECAPed (E8) alloy presented the best strength of all the ECAPed alloys, and the post rolling endowed the alloy (E8R) further strengthening and the best strength of all the alloys. Grain-boundary strengthening and dislocation strengthening were the two major factors for the high strength of the processed alloys. The α-Mg phase grains were greatly refined to about 2 μm after 8-passes ECAP, and was further refined to about 800 nm ~1.5 μm after rolling. Significant grain refinement endowed the alloy with sufficient grain-boundary strengthening. Profuse intragranular dislocation accumulated in the deformed matrix, leading to the significant dislocation hardening of the alloy. Rolling-induced strong basal texture of the α-Mg phase also enhanced the further strengthening of the E8R alloy.

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“…In terms of magnesium alloy plates, normally melted in the inert argon gas and produced by rolling processes, their strengthening mechanism includes solid-solution, grain-refinement and secondary-phase precipitations to improve the mechanical properties of magnesium alloys. Al and Zn are the most common alloying elements for Mg-Li base alloys [5,6]. For the LZ91 plates, which are processed by rolling and heat treatments, their microstructure and mechanical behavior was investigated.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of mechanical properties for Mg-9Li-1Zn alloy by accumulative roll bonding

Saufan

Wang

2020

Mater. Res. Express

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The microstructures and mechanical properties of LZ91 alloys by accumulative roll bonding (ARB) were firstly investigated. The results show that the cycle numbers of ARB process and preheating temperatures before ARB process have an impact on the microstructures and mechanical properties of LZ91 alloys. The microstructures of LZ91 sheets after ARB perform two main phases of α and β in the fibrous form. ARB process can drive more numbers of crystallographic planes for α and β phases in LZ91 alloys to proof the grain refinement after ARB. More cycle numbers of ARB on LZ91 sheets makes the fibrous microstructures finer and increases the mechanical properties such as hardness and ultimate tensile strength due to the mechanism of strain hardening and grain refinement.

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Improvement of mechanical behaviors of a superlight Mg-Li base alloy by duplex phases and fine precipitates

Cited by 88 publications

References 39 publications

Hot Deformation Treatment of Grain-Modified Mg–Li Alloy

Hot Deformation Treatment of Grain-Modified Mg–Li Alloy

Development of a High Strength Mg-9Li Alloy via Multi-Pass ECAP and Post-Rolling

Enhancement of mechanical properties for Mg-9Li-1Zn alloy by accumulative roll bonding

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