Microstructure and mechanical properties of LA51 and LA51–0.5Y alloys with different accumulated strains and rolling temperatures

Wang, Tianzi; Zhu, Tianlong; Wu, Ruizhi; Miao, Wei; Zhang, Jinghuai; Zhang, Milin

doi:10.1016/j.matdes.2015.07.003

“…"a," "b," and "d" introduce the ellipse's major and minor diameters and the initial circle diameter, respectively. indicated two independent slip systems and β-Li phase with BCC structure presents at least twelve autonomous slip systems at room temperature, so Mg alloys containing the BCC structure such as Mg-Li could have more ductility [8]. Also, it could be concluded that more elongation at room temperature that was occurred due to β-Li phase.…”

Section: Anisotropy and Formabilitymentioning

confidence: 94%

“…The α-Mg phase of the HCP structure precipitates in the matrix of the β-Li, which is of a body center cubic (BCC) structure [11,12]. Generally, for Mg LZ dual phase alloys, α-Mg phase with HCP structure indicates two independent slip systems and β-Li phase with BCC structure presents at least twelve autonomous slip systems at room temperature [8]. Therefore, it can be concluded that more deformation at room temperature occurs in β-Li phase because β-Li phase has a higher ductility and lower strength compared to α-Mg phase [13,14].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mechanical Properties, Formability, and Anisotropy of Dual Phase Mg-7Li-1Zn

Rahmatabadi,

Hashemi,

Tayyebi

et al. 2019

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In this article, the mechanical properties, microstructure, forming limit diagram (FLD) and anisotropy of dual phase Mg-7Li-1Zn alloy have been evaluated by a uniaxial tensile test at three directions, scanning electron microscopy (SEM), optical microscopy (OM) and hemispherical punch test at ambient temperature. The optical microscopy images showed that the microstructure of as-cast LZ71 alloy possesses a dual phase microstructure such as β-Li matrix with bodycentered cubic (BCC) structure and a partitioned α-Mg phase with hexagonal closest packed (HCP) structure in lath shape. After rolling process, the α-Mg phase has been elongated and arranged in the rolling direction and anisotropy at different directions increased, but after full annealing, microstructure arranged more uniform and changed from elongated to the uniform structure which this is the factor that reflects the reduction of anisotropy. FLD shows the limiting surface strains that sheet metal can endure before the start of localized necking and fracture at different deformation modes in tension-tension and tension-compression loading paths. The FLD of Mg-7Li-1Zn showed that this material has desirable formability due to the BCC structure with high slip system in the ambient temperature. Also, the results of the tensile test matched with the Preprint of: Davood Rahmatabadi, Ramin Hashemi, Moslem tayyebi and Abbas Bayati. (2019). Investigation of mechanical properties, formability, and anisotropy of dual phase Mg-7Li-1Zn. Materials Research Express.

show abstract

“…According to the research of Hanwu et al, 33 the rise of the strain rate causes the dual-phase Mg-Li alloys elongation and tensile strength decreased and increased, respectively. Also, the effect of rolling temperature and accumulated applied strain on the Mg LA51 and LA51 + 0.5Y alloys have been evaluated by Wang et al 34 which LA51 + 0.5Y showed more proper mechanical properties compared to LA51. Although several types of research were performed regarding the Mg-Li mechanical properties, 35 rolling process effects, 36 and fracture behavior, 37,38 fewer studies focused on the impact of the roll bonding process on these alloys.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing of three-layered sandwich composite of AA1050/LZ91/AA1050 using cold roll bonding process

Rahmatabadi

¹

,

Pahlavani

²

,

Marzbanrad

³

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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In this paper, for the first time, dual-phase Mg-Li alloy is used to produce a three-layered Al/Mg/Al composite with the use of the cold roll bonding process. The low density and high ductility are known as the essential advantages of the Mg-Li alloys, while a couple of important problems should be taken into account, namely low corrosion resistance and low strength. It has been tried to deal with the mentioned problems by performing cold work and cover the Mg sheet with the Al similar plates. To investigate the Mg-Al layers bonding quality, mechanical properties and microstructure were examined for different thicknesses reduction ratio. The peeling test results showed that with increasing rolling pressure, the size and number of cracks on the brittle surfaces due to brushing, surface expansion, and metal extrusion between the cracks were improved by rising the reduction thickness ratio, bond strength enhanced, sharply. The UTS of 33.33% thickness reduction three-layered Al/Mg sample was obtained 186.5 MPa, which was more than 2.1 and 1.3 times higher than the initial Al1050 and MgLZ91 samples, respectively. However, because of increasing the amount of thickness reduction, roll-bonded layers’ quality, the tensile strength of the composite, and the microhardness of both layers increased. Furthermore, the elongation has reduced, and the maximum ultimate tensile strength and microhardness were achieved at 66.67% thickness reduction.

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“…Magnesium alloys are a hexagonal close-packed (HCP) structure, which leads to reduced formability in ambient temperature [3,[5][6][7]. Magnesium-Lithium alloy is one of the most favorable engineering metal due to its incredible properties, such as high formability and ultralow density [3,[8][9][10]. According to magnesium-lithium binary phase diagram, when the lithium quantity is higher than 5.7 wt.% and lower than 11 wt.% (between 5.7 and 11 wt.%), the microstructure is formed of the dual α-Mg + β-Li dual phase.…”

Section: Introductionmentioning

confidence: 99%

Investigation of mechanical properties, formability, and anisotropy of dual phase Mg–7Li–1Zn

Rahmatabadi

¹

,

Hashemi

²

,

Tayyebi

³

et al. 2019

Mater. Res. Express

View full text Add to dashboard Cite

In this article, the mechanical properties, microstructure, forming limit diagram (FLD) and anisotropy of dual phase Mg-7Li-1Zn alloy have been evaluated by a uniaxial tensile test at three directions, scanning electron microscopy (SEM), optical microscopy (OM) and hemispherical punch test at ambient temperature. The optical microscopy images showed that the microstructure of as-cast LZ71 alloy possesses a dual phase microstructure such as β-Li matrix with bodycentered cubic (BCC) structure and a partitioned α-Mg phase with hexagonal closest packed (HCP) structure in lath shape. After rolling process, the α-Mg phase has been elongated and arranged in the rolling direction and anisotropy at different directions increased, but after full annealing, microstructure arranged more uniform and changed from elongated to the uniform structure which this is the factor that reflects the reduction of anisotropy. FLD shows the limiting surface strains that sheet metal can endure before the start of localized necking and fracture at different deformation modes in tension-tension and tension-compression loading paths. The FLD of Mg-7Li-1Zn showed that this material has desirable formability due to the BCC structure with high slip system in the ambient temperature. Also, the results of the tensile test matched with the Preprint of: Davood Rahmatabadi, Ramin Hashemi, Moslem tayyebi and Abbas Bayati. (2019). Investigation of mechanical properties, formability, and anisotropy of dual phase Mg-7Li-1Zn. Materials Research Express.

show abstract

Microstructure and mechanical properties of LA51 and LA51–0.5Y alloys with different accumulated strains and rolling temperatures

Cited by 19 publications

References 24 publications

Investigation of Mechanical Properties, Formability, and Anisotropy of Dual Phase Mg-7Li-1Zn

Investigation of Mechanical Properties, Formability, and Anisotropy of Dual Phase Mg-7Li-1Zn

Manufacturing of three-layered sandwich composite of AA1050/LZ91/AA1050 using cold roll bonding process

Investigation of mechanical properties, formability, and anisotropy of dual phase Mg–7Li–1Zn

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