The microstructure evolution during semisolid molding of a creep-resistant Mg–5Al–2Sr alloy

Czerwiński, F.; Zielińska‐Lipiec, A.

doi:10.1016/j.actamat.2005.03.048

Cited by 46 publications

(40 citation statements)

References 9 publications

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“…Consequently, the Al 11 RE 3 intermetallic compound has high chemical and thermal stability than the phase. 5,17,21) The main strengthening phase in the Mg-8Al alloy is the phase, which has a low melting point of approximately 735 K 19) and poor thermal stability. The phase is readily coarsened and softened at the temperatures above 393-403 K. 4,5) Additionally, the phase has a cubic crystal structure that is incoherent with the h.c.p.…”

Section: Creep Property Of Mg-8al-xre Alloysmentioning

confidence: 99%

Creep Behavior of Extruded Sheets of Magnesium Alloys Containing La-Rich Mischmetal

Jain

Koo

2006

Mater. Trans.

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In this study, the effect of RE content on the microstructure and creep properties of Mg-8Al-xRE (x ¼ 0, 1, 2 or 3 mass%) alloys were investigated. The microstructural analysis and phase characterizations of Mg-8Al alloy with 1-3 mass% RE (La-rich Mischmetal) additions were conducted. (i) The as-extruded Mg-8Al-xRE alloys consisted of an -Mg matrix, (Mg 17 Al 12 ) and Al 11 RE 3 compounds. (ii) Raising the extent of RE in the alloy also increases the amount and coarsening of the Al 11 RE 3 compounds, but the amount of phase diminishes and turns into the fine particles. The creep rupture life increment measured at 423 K is around 40-100 MPa, and the creep rupture life over 423 K is also prolonged. The marked improvement in high-temperature tensile creep properties is attributed to the fine rod-like Al 11 RE 3 compound having high thermal stability in the alloys.

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Section: Creep Property Of Mg-8al-xre Alloysmentioning

confidence: 99%

Creep Behavior of Extruded Sheets of Magnesium Alloys Containing La-Rich Mischmetal

Jain

Koo

2006

Mater. Trans.

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“…Jing et al [12] recently investigated the microstructure and tensile creep behavior of Mg-Al-Sr (AJ) based alloys and reported that a ternary interphase exists in the alloys containing 2-3 wt% Sr at the grain boundaries. Czerwinski and Zielinska-Lipiec [13] investigated the microstructural evolution of a Mg 5 Al 2 Sr (wt%) alloy and reported that the common feature of Sr-containing phases in the as-cast ingots is their location at grain or sub-grain boundaries. The presence of Mg 17 Al 12 suggests an insufficient amount of Sr to bind all Al.…”

Section: Introductionmentioning

confidence: 99%

Microstructural characterization of Mg–Al–Sr alloys

Aljarrah

Parvez

et al. 2007

Science and Technology of Advanced Materials

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The microstructural details of fourteen Mg-Al-Sr alloys were investigated in the as-cast form by a combination of scanning electron microscopy/energy dispersive spectrometer (SEM/EDS) analysis and quantitative electron probe microanalysis (EPMA). The heat transfer method coupled with the DSC measurement has been utilized to determine the solidification curves of the alloys. The morphology and the chemical composition of the phases were characterized. The microstructure of the alloys is primarily dominated by (Mg) and (Al 4 Sr). In the present investigation, ternary solid solubility of three binary compounds extended into the ternary system has been reported and denoted as: (Al 4 Sr), (Mg 17 Sr 2 ) and (Mg 38 Sr 9 ). The (Al 4 Sr) phase is a substitutional solid solution represented by Mg x Al 4Àx Sr and has a plate-like structure. The maximum solubility of Al in Mg 17 Sr 2 was found to be 21.3 at%. It was also observed that Mg 38 Sr 9 dissolved 12.5 at% Al. r

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“…[1][2][3] Mg-Al-Zn series alloy, especially AZ91 alloy, is the most popular magnesium alloy, since the AZ91 exhibits excellent die castability and a good balance of strength and ductility. [4][5][6] However, the applications of AZ91 alloy have limited due to the low strength, poor creep and corrosion resistance at temperatures in excess of 393 K. 7) The deterioration of the properties makes it unsuitable for many components in automobile engines. 8,9) The previous investigation 10) showed that the grain boundary sliding is significant to the deformation mechanism at elevated temperatures in Mg-Al based alloys.…”

Section: Introductionmentioning

confidence: 99%

Creep and Corrosion Properties of the Extruded Magnesium Alloy Containing Rare Earth

Jain

Koo

2007

Mater. Trans.

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Effects of microstructures on the creep and corrosion properties were investigated in the Mg-8Al alloys with addition of the rare earth elements (La-rich Mischmetal, RE). The addition of RE to Mg-8Al alloy may form a stable intermetallic phase, Al 11 RE 3 at elevated temperature, and suppress the phase (Mg 17 Al 12 ) with poor stability at high temperature. The corrosion rate of the alloy slightly decreases with increasing the added RE contents. The constant-load creep behavior was examined at 423, 448 and 473 K under stresses between 40 and 100 MPa. The RE-containing alloy showed a prolonged period of stead-state creep compared to the Mg-8Al base alloy and slightly reduced minimum creep rates. A stress exponent of 2 estimated suggests that the creep behavior can be controlled by the grain boundary sliding. The apparent activation energy for creep of Mg-8Al and Mg-8Al-2RE alloys are 114 and 104 kJ mol À1 , respectively.

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The microstructure evolution during semisolid molding of a creep-resistant Mg–5Al–2Sr alloy

Cited by 46 publications

References 9 publications

Creep Behavior of Extruded Sheets of Magnesium Alloys Containing La-Rich Mischmetal

Creep Behavior of Extruded Sheets of Magnesium Alloys Containing La-Rich Mischmetal

Microstructural characterization of Mg–Al–Sr alloys

Creep and Corrosion Properties of the Extruded Magnesium Alloy Containing Rare Earth

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