Ultra-high strength Mg-Li alloy with B2 particles and spinodal decomposition zones

Zhang, Shun; Wu, Ruizhi; Zhong, Fei; Ma, Xiaochun; Xiang, Wang; Wu, Qiang

doi:10.1016/j.fmre.2022.01.023

Cited by 5 publications

(2 citation statements)

References 22 publications

(24 reference statements)

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“…[20] Its formation can be attributed to the local segregation of Li atoms under thermal effects (Li-rich means Mg-poor). [21,22] In the bright-field TEM mode, after the incident electron beam penetrates through the Mg-poor spinodal decomposition zones, the intensity of electrons passing through the aperture of the objective lens is higher than that of the surrounding matrix due to the lower average atomic number. Thus, the contrast of the Mg-poor spinodal decomposition zone is higher.…”

Section: Microstructure Of the As-rolled Lz139 Alloymentioning

confidence: 99%

A Novel Ordered B2 Particle Strengthened Mg–Li–Zn Alloy

Zhang

Sun

et al. 2022

Adv Eng Mater

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Mg–13Li–9Zn alloy is prepared by casting and hot rolling. The microstructure evolution and mechanical properties are systematically investigated by optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), and tensile tests. A large number of B2 nanoparticles semicoherent with the matrix are uniformly dispersed within the grains of the as‐cast Mg–13Li–9Zn alloy, which increases the hardness by three times compared with that of the as‐cast Mg–13Li alloy. However, the continuously distributed MgLi2Zn phase at the grain boundary reduces the ability to resist tensile stress, resulting in intergranular fracture at the elastic deformation stage. After rolling, dynamic recrystallization occurs, and both the strength and ductility are improved. The B2 particles have good thermal stability and maintain a semicoherent relationship with the matrix during the hot rolling process. In addition, some spinodal decomposition zones are introduced into the matrix via the rolling process. The yield strength (YS) and elongation (EL) of the rolled alloy reach 280 MPa and 22%, respectively.

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Section: Microstructure Of the As-rolled Lz139 Alloymentioning

confidence: 99%

A Novel Ordered B2 Particle Strengthened Mg–Li–Zn Alloy

Zhang

Sun

et al. 2022

Adv Eng Mater

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“…Therefore, in the steel welding and melting process, magnesium may evaporate directly, which brings great challenges to the welding of magnesium and steel. To date, connections between magnesium and steel have been made, and various welding techniques have been employed [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. H. Zhou et al conducted laser fusion welding experiments with aluminum foil in DP590 dual-phase steel and AZ31B magnesium alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Welding Parameters on Joint Structure of AZ31B Magnesium Alloy and 304 Stainless Steel

Wan

Zhang

et al. 2022

Materials

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The effects of laser welding parameters on the interface microstructure of AZ31B magnesium alloy and 304 stainless steel were investigated. After welding, a scanning electron microscope and ultra-depth of field microscope were used to observe the microstructure of the welded material, to analyze the effects of power on the interface morphology. The simulation of laser welding of magnesium and steel was carried out by the COMSOL software. The results showed that when the power was 15 W–20 W, the temperature did not reach the melting point of magnesium alloy, there was MgO at the welding, and the interface had poor connection strength. When the power was 35 W–50 W, the temperature reached or even exceeded the boiling point of magnesium alloy, and the interface formed hot cracks, pores, and oxides and had poor joint strength. When the power was 25 W–30 W, the temperature was between the melting point and boiling point of magnesium, and the interface had excellent connection strength.

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