Effects of elemental additions (Si and Sb) on the ageing behavior of AZ91 magnesium alloy

Srinivasan, A.; Pillai, U.T.S.; Pai, B.C.

doi:10.1016/j.msea.2010.07.020

Cited by 41 publications

(11 citation statements)

References 25 publications

(42 reference statements)

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“…This alloy, containing 9 wt% Al, 1 wt% Zn, and 0.2-0.3 wt% Mn as major alloying elements, contains a good combination of castability, mechanical strength, and ductility (Suresh et al 2009). This has made AZ91 a popular light metal alloy especially among automotive industries whose aim is manufacturing lightweight vehicles (Srinivasan et al 2010). However, the use of AZ91 in different industries is not yet extended comparing to its competitors such as aluminum alloys and plastics, partially due to the difficulty in controlling its microstructure (Asadi et al 2010a).…”

Section: Introductionmentioning

confidence: 99%

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Asadi

Givi

Akbari

2015

Int J Mech Mater Eng

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Background: Recently, some researchers have simulated FSW using FEM and studied the influence of process parameters and tool geometry on material flow, welding force, and temperature and strain distributions during friction stir processing. Additionally, in terms of microstructure modeling, various approaches such as the Cellular Automaton (CA) model have been developed to simulate microstructural evolution during plastic deformation processes. Method: In this work, a finite element model (FEM) is established to study the microstructure evolution during friction stir welding (FSW) of AZ91 magnesium alloy. To this aim, first, the hot compression tests at different temperatures and strain rates were carried out to achieve the flow stress curves. Then, the hardening parameter, the recovery parameter and the strain rate sensitivity were calculated according to flow stress results and using the Kocks−Mecking model. Next, a continuum based thermo-mechanically coupled rigid-viscoplastic FEM model was proposed in Deform-3D software to simulate the FSW of AZ91 magnesium alloy. To evaluate microstructure of the weld zone a model is proposed based on the combination of Cellular Automaton and Laasraoui-Jonas models.

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Section: Introductionmentioning

confidence: 99%

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Asadi

Givi

Akbari

2015

Int J Mech Mater Eng

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“…5(a), there was no Mg 17 Al 12 phase, and only Al 2 Yb phase still appeared at the grain boundaries even after 4 h of homogenized treatment, which indicated that the Al 2 Yb phase was thermally more stable than the Mg 17 Al 12 phase. 12) In addition, the grain size was gradually decreased with increasing Yb content in the Mg5Al. J. Zhang et al 13) have reported that based on the principles of solidification and the binary phase diagram of the Mg-RE system, the distribution coefficient of solute RE is less than 1, so that during the solidification process, solute atoms of RE, as well as Al, are enriched in the liquid ahead of the solid-liquid interface.…”

Section: Microstructurementioning

confidence: 96%

Investigation on the Microstructure and Mechanical Properties of Mg-Al-Yb Alloys

Park

Kim

et al. 2011

Mater. Trans.

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The effects of Yb addition on the microstructure and mechanical properties of Mg-5Al alloy are investigated. The results indicate that the addition of Yb to the Mg-5Al alloy facilitates the formation of a thermally stable Al 2 Yb phase, the refinement of the microstructure and the suppression of the volume fraction of Mg 17 Al 12 phase in Mg-5Al alloy. Yb addition has little effect on the mechanical properties of the experimental alloys tested at room temperature. At elevated temperatures, however, the ultimate tensile strength (UTS) is significantly increased by Yb addition and Mg-5Al-1Yb has the highest UTS value than other experimental alloys. On the other hand, the yield strength (YS) increases at all tested temperatures due to the grain refinement and dispersion strengthening of the secondary phase. Meanwhile, the elongation (") of the experimental alloys decreases at all tested temperatures. Tensile fractographic analysis indicates that cleavage fracture is the dominant mechanism of the Mg-5Al and Mg-5Al-xYb alloys at room temperature. At elevated temperatures, however, the fracture mechanism of experimental alloys mainly changes from cleavage to quasi-cleavage fracture.

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“…Moreover, the rate of diffusion of Al and Mg atoms along the grain boundary is inhibited by the pinning action of Al 2 Y and Mg 2 Sn phases at the boundaries. The remaining region is formed by continuous precipitate in the grain [21,27,28]. The hardness of AZ91-0.5Sn alloy increases with an increase in the quantity of Y added to it.…”

Section: As-cast and Aged Microstructural Characterizationmentioning

confidence: 99%

Mechanical characterization and corrosion behavior of newly designed Sn and Y added AZ91 alloy

et al. 2015

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Effects of elemental additions (Si and Sb) on the ageing behavior of AZ91 magnesium alloy

Cited by 41 publications

References 25 publications

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Investigation on the Microstructure and Mechanical Properties of Mg-Al-Yb Alloys

Mechanical characterization and corrosion behavior of newly designed Sn and Y added AZ91 alloy

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