Strong and ductile heat-treatable Mg–Sn–Zn–Al wrought alloys

Sasaki, Taisuke; Elsayed, F.R.; Nakata, T.; Ohkubo, T.; Kamado, Shigeharu; Hono, K.

doi:10.1016/j.actamat.2015.06.060

Cited by 158 publications

(62 citation statements)

References 44 publications

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“…In compression, the TX22-220 and TX22-240 alloys exhibit the compressive yield strength (CYS) of 319 MPa and 308 MPa, and the compression/tension yield ratio can be calculated to be 0.72 and 0.73, respectively, as listed in Table 1. The two extruded alloys show an lower asymmetry than those of the commercial Mg alloys having asymmetry ratio usually lower than 0.5, including the Mg-Mn and Mg-Al-Zn alloys [30,31]. As to the TX22-280 alloy, the compressive ultimate strength is 415 MPa and CYS is 349 MPa, and its asymmetry ratio of 0.9 is obviously larger than that of the TX22-220 or TX22-240 alloy ( Table 1).…”

Section: Mechanical Propertiesmentioning

confidence: 95%

“…Moreover, the total amount of solute addition would usually exceed 8 wt%, which is not cost-effective for their applications. Recently, Sasaki et al developed a new Mg-5.4Sn-4.2Zn-2.0Al-0.2Mn (wt.%) alloy via nano-precipitations, while the highest YS is still lower than 350 MPa [31]. Besides, there have been lots of attempts to develop the novel Mg-Ca based alloy.…”

Section: Novelty Of Present Ca-containing Mg Alloysmentioning

confidence: 99%

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Development of low-alloyed and rare-earth-free magnesium alloys having ultra-high strength

et al. 2018

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Developing ultra-high strength in rare-earth-free Mg alloys using conventional extrusion process is a great challenge. What is even more difficult is to achieve such a goal at a lower processing cost. In this work, we report a novel low-alloyed Mg-2Sn-2Ca alloy (in wt. %) that exhibits tunable ultra-high tensile yield strength (360e440 MPa) depending on extrusion parameters. More importantly, there is little drop in mechanical properties of this alloy even when it is extruded at a speed several times higher than those used in the reported high strength Mg alloys. Examination of as-extruded microstructures of this Cacontaining Mg alloy reveals that the ultra-high strength is mainly associated with the presence of surprisingly submicron matrix grains (down to~0.32 mm). The results suggest that the Ca addition promotes accumulations of the pyramidal dislocations, which eventually transform into the low angular grain boundaries (LAGBs). The high number density of LAGBs separate the a-Mg matrix via either discontinuous dynamic recrystallization (DDRX) mechanism in the early stage or the continuous dynamic recrystallization (CDRX) mechanism in the later stage of extrusion, which effectively enhances the nucleation rates of the DRXed grains. More importantly, large amount of Ca segregation along LAGBs, accompanied with dynamically precipitated Mg 2 Ca nano-phases, are detected in the present nonseverely deformed samples. It is the combination of solute segregations and numerous Mg 2 Ca nanoprecipitates that contributes to the formation of the ultra-fine grains via pinning mechanism. The ultrafine grains size, Ca enrichment in most LAGBs, and residual Mg 2 Ca nano-precipitates would in turn contribute significantly to the enhancement of the yield strength of the as-extruded Mg-2Sn-2Ca (wt.%) alloy. The low content of alloying elements and the fast one-step extrusion process render the present alloys low-cost and thus have great potential in large-scale industry applications.

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Section: Mechanical Propertiesmentioning

confidence: 95%

Section: Novelty Of Present Ca-containing Mg Alloysmentioning

confidence: 99%

Development of low-alloyed and rare-earth-free magnesium alloys having ultra-high strength

et al. 2018

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“…From the GDOES elemental depth profiles (Figure ), it can be seen that the concentration of magnesium and silicon is higher during the initial stage of the sputtering compared to the deeper depths indicating that the surface is enriched in magnesium‐silicon particles. This can be attributed to the heat treatment of the alloy, which causes diffusion of magnesium and silicon to the surface . Reported literature showed cases where thermal treatment has resulted in the enrichment of magnesium and silicon in the surface oxide .…”

Section: Resultsmentioning

confidence: 99%

Influence of de‐icing salt chemistry on the corrosion behavior of AA6016

Schoukens

Cavezza

Cerezo

et al. 2017

Materials & Corrosion

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De‐icing salts are commonly used on European roads during winter and are usually based on chlorides of sodium, magnesium, or calcium. The salt selection depends on the local climate and legislation. Therefore, the chemical composition of the de‐icing mixture can be very different within Europe. This represents an important challenge for the automotive industry as the corrosion behavior of automotive parts is intricately linked to the chemistry of the road environment. Furthermore, the use of aluminium alloys in the automotive industry increases due to a constant search for weight reduction. Till now, most of the corrosion studies on aluminium alloys in chloride based solutions have only been focused on sodium chloride. In this study, the effect of different chloride based salts on the corrosion of AA6016 was investigated. For that purpose, potentiodynamic polarization measurements were combined with surface analysis by SEM‐EDS and depth profiling using GDOES. Salts based on sodium and calcium showed similar effects on the corrosion behavior of AA6016 while the magnesium based salt reduced the corrosion rate. Mixture of sodium and magnesium based salts increased the corrosive attack.

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“…With Sn addition to Mg-Li alloys, the lamellar Mg 2 Sn presented in the dendritic crystal boundary and a tiny granular Mg 2 Sn existed inside the grains, resulting in the significant refinement of the secondary dendrite arm spacing of the α-Mg phase [18][19][20]. Furthermore, Zeng et al [21] and Yin et al [22] have studied the effect of Sn on the grain refinement of Mg-Li alloys.…”

Section: Introductionmentioning

confidence: 99%

Grain Refinement Mechanism of the As-Cast and As-Extruded Mg–14Li Alloys with Al or Sn Addition

Zeng

Jiang

et al. 2017

Metals

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Abstract:The microstructures of the as-cast and as-extruded Mg-14 wt. % Li-1 wt. % Al (LA141) and Mg-14 wt. % Li-2 wt. % Sn (LT142) were observed by optical and scanning electron microscope (SEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The effects of Al and Sn on the grain refinement on the Mg-14Li alloy were investigated. In addition, the mechanism of grain refinement on the as-cast and as-extruded alloys was discussed from the view of the solute effect and heterogeneous nucleation effect via edge-to-edge matching model. The results showed that the average grain sizes of the as-cast LA141 and LT142 alloys were similar due to the close solute effect of 1.1 wt. % Al and 1.8 wt. % Sn, while, in the as-extruded alloys, the average grain size of LT142 was over two times finer than that of LA141. This was attributed to the reason that Li 2 MgSn particles can serve as heterogeneous nucleation sites for the β-Li matrix during the process of dynamic recrystallization (DRX), but LiMgAl 2 cannot serve the same way. Therefore, Sn can act as a more effective grain refiner for the Mg-14Li alloy compared to Al.

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Strong and ductile heat-treatable Mg–Sn–Zn–Al wrought alloys

Cited by 158 publications

References 44 publications

Development of low-alloyed and rare-earth-free magnesium alloys having ultra-high strength

Development of low-alloyed and rare-earth-free magnesium alloys having ultra-high strength

Influence of de‐icing salt chemistry on the corrosion behavior of AA6016

Grain Refinement Mechanism of the As-Cast and As-Extruded Mg–14Li Alloys with Al or Sn Addition

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