Effect of La content on microstructure, thermal conductivity and mechanical properties of Mg–4Al magnesium alloys

Liu, Y.F.; Jing, Xue; Qiao, Xiao Guang; Xu, Shun; Zheng, M.Y.

doi:10.1016/j.jallcom.2019.07.267

Cited by 51 publications

(11 citation statements)

References 33 publications

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“…Besiders, when the La/Nd is 2/1 (Alloys VI) shows higher ductility than other AZ91-xLa/Nd alloys. Liu [38] reported that the strength and elongation of Mg-4 wt% Al alloys may decrease with the increasing amount of coarse and brittle intermetallics. The high ductility of Alloys VI should be related to the shortest average length of the needle-phase.…”

Section: Resultsmentioning

confidence: 99%

Effect of La/Nd ratio on microstructure and mechanical properties of as-cast AZ91-xLa/Nd alloy

Cui

et al. 2020

Mater. Res. Express

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The effect of La/Nd ratio on microstructure and mechanical properties of as-cast AZ91D alloys were investigated. The alloys were produced by casting the molten metal into a preheated steel mould. Microstructures were investigated by XRD and SEM (equipped with EDS). The hardness measurement was carried out by Brinell hardness (HB) digital display tester. Compression tests were conducted at both room and high temperatures (20°C and 150°C). Microstructural characterizations reveal that the area fraction of the β-Mg 17 Al 12 phase changed with the variation of La/Nd ratio. The area fraction of the β-Mg 17 Al 12 phase decrease significantly and then increased slightly with the increase of La/Nd ratio. Besides, the results show that the addition of La and Nd contributed to the formation of needle-like phase Al 11 RE 3 . Meanwhile, the Brinell hardness and high-temperature compression properties of this alloy reach the maximum values (67 HB and 330 MPa, respectively) when the La/Nd ratio is 2/3. In this alloy, the amount of Al 11 RE 3 phase is 51/TA and the average length is 69.55 μm. Moreover, a generation model of Al 11 RE 3 is established and the growth mechanism of Al 11 RE 3 is analyzed. This work thus has proved that La/Nd ratio has a great effect on the microstructure and mechanical properties of AZ91.

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Section: Resultsmentioning

confidence: 99%

Effect of La/Nd ratio on microstructure and mechanical properties of as-cast AZ91-xLa/Nd alloy

Cui

et al. 2020

Mater. Res. Express

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“…54.8% increase in ultimate tensile strength compared to AZ91 alloy, from 225.5 ± 6.7 to 349.0 ± 5.0 MPa. Due to the refined matrix, the high density grain boundaries bore more stress [9]. According to the stress-strain curve, both the yield strength and strain hardening exhibited positive stress dependence (Figure 7b).…”

Section: Solidification Behavior and Mechanical Propertiesmentioning

confidence: 99%

“…As a result, microcracks formed around Mg 17 Al 12 CPs took the place of cleavage cracks around Mg 17 Al 12 DPs and led to ductile fracture [34]. Another crucial effect brought about by more microcracks and twins induced by La alloying was the release of the stress concentration during the deformation process [9,12]. At the final tensile stage, the high tensile strength of the AZ91-La alloys was attributed to the specific orientations of the grains and the elevating density of the grain boundaries, while the activation of basal glide contributed to the improved ductility of the AZ91-La alloys [35].…”

Section: Fracture Behaviormentioning

confidence: 99%

“…Among the various cast magnesium alloys, AZ91 alloy became one of the most widely used cast magnesium alloys due to its outstanding castability and aging hardenability [7,8]. Despite these advantages, AZ91 alloy still has some other limitations, including low ductility, insufficient formability, low Young's modulus and poor corrosion resistance, which narrow its industrial applications [9,10]. Thus, the improvement of AZ91 alloy's comprehensive performance, especially its mechanical properties, has become a research focus in recent years.…”

Section: Introductionmentioning

confidence: 99%

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The Evolution of Microstructure, Mechanical Properties and Fracture Behavior with Increasing Lanthanum Content in AZ91 Alloy

Tie

Jiang

Guan

et al. 2020

Metals

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AZ91 alloy is a widely applied commercial magnesium alloy due to its good castability, balanced mechanical properties and acceptable price, and lanthanum alloying has been proven to be one of the most effective methods to further improve its mechanical properties. Therefore, we reveal the evolution of microstructure, mechanical properties and fracture behavior with increasing lanthanum content in AZ91 alloy in this study. The magnesium matrix was significantly refined by lanthanum content, and this effect became more evident with increasing addition of lanthanum. The presence of Al3La precipitates significantly reduced the grain mobility and suppressed the formation of Mg17Al12 discontinuous precipitates along the grain boundaries. The rheo-cast alloys exhibited improved and balanced tensile strength and ductility after aging treatment. The fracture type of AZ91-La alloys could be classified as ductile fracture due to the presence of less quasi-cleavage planes and more dimples with a mixture of tear ridges and micropores. Due to the fully refined microstructure and the balanced mechanical properties, the AZ91–1.0La (mass%) alloy presented the greatest potential for industrial applications among the three studied AZ91-La alloys.

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“…The relationship among solid material thermal conductivity λ, specific heat C, coefficient of thermal expansion α and density ρ is shown in Eq. 4 (Liu et al, 2019):…”

Section: Effect Of Cr Content On the Specific Heat Of Fe-xcr-6al Cladmentioning

confidence: 99%

Preparation and Properties Study of Cr on FeCrAl Cladding Materials

Wang

Qiao

et al. 2021

Front. Mater.

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FeCrAl alloy is a promising candidate material for the fourth-generation reactor core cladding material. Adjustment of the Cr content is one of the effective ways to obtain enhanced performance for the FeCrAl alloy. In this work, Fe–xCr–6Al alloy (11 ≤ x ≤ 15) with different Cr content were successfully prepared by hot rolling. When Cr replacement of Fe atoms in Fe–xCr–6Al alloy rises from 11 to 15wt%, the lattice distortion of Fe–xCr–6Al alloy increases, and the mechanical properties and thermal conductivity of the Fe–xCr–6Al alloy are raised. Compared with Al content, Cr content has less effect on Fe–xCr–6Al oxidation resistance.

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Effect of La content on microstructure, thermal conductivity and mechanical properties of Mg–4Al magnesium alloys

Cited by 51 publications

References 33 publications

Effect of La/Nd ratio on microstructure and mechanical properties of as-cast AZ91-xLa/Nd alloy

Effect of La/Nd ratio on microstructure and mechanical properties of as-cast AZ91-xLa/Nd alloy

The Evolution of Microstructure, Mechanical Properties and Fracture Behavior with Increasing Lanthanum Content in AZ91 Alloy

Preparation and Properties Study of Cr on FeCrAl Cladding Materials

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