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

Jain, Chao‐Chi; Koo, Chun-Hao

doi:10.2320/matertrans.47.433

Cited by 10 publications

(4 citation statements)

References 25 publications

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“…In Mg-3Al alloy, the dispersed Mg 17 Al 12 phase is distributed inside the Mg matrix. A uniformly distributed bright white phase appeared in the Mg-3Al-2.5La alloy (Figure 3b) in rod-like (Al 11 La 3 ) and polygon-type (Al 2 La, Al 2.12 La 0.88 ) shapes, which is consistent with earlier reports [3,21,[25][26][27][28][29]. The brighter second phase in Figure 3c is broken into even finer shapes in the Mg-3Al-2.5La-1.9Y2O3 alloy, especially rod-like shapes, illustrating the ability of Y2O3 nanoparticles to refine the second phases.…”

Section: Microstructural Characterizationsupporting

confidence: 82%

“…X-ray diffraction (XRD) studies conducted in the longitudinal direction of the samples are shown in Figure 4. These diffractograms did not reveal the presence of any La phase with Mg, which is consistent with other available reports on Mg-Al-La alloys [8,21,22,[25][26][27][28][29]31,32]. However, they revealed the strong presence of Mg peaks together with the phase comprised of Al 11 La 3 , Al 2 La and Al 2.12 La 0.88 , which are also observed in the SEM micrographs.…”

Section: Microstructural Characterizationsupporting

confidence: 81%

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Improved Compressive, Damping and Coefficient of Thermal Expansion Response of Mg–3Al–2.5La Alloy Using Y2O3 Nano Reinforcement

Kumar

Tun

Kohadkar

et al. 2017

Metals

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Abstract:In the present study, the effects of the addition of Y 2 O 3 nanoparticles on Mg-3Al-2.5La alloy were investigated. Materials were synthesized using a disintegrated melt deposition technique followed by hot extrusion. The samples were then characterized for microstructure, compression properties, damping properties, CTE (coefficient of thermal expansion) and fracture morphology. The grain size of Mg-3Al-2.5La was significantly reduced by the addition of the Y 2 O 3 nano-sized reinforcement (~3.6 µm, 43% of Mg-3Al-2.5La grain size). SEM and X-ray studies revealed that the size of uniformly distributed intermetallic phases, Al 11 La 3 , Al 2 La, and Al 2.12 La 0.88 reduced by the addition of Y 2 O 3 to Mg-3Al-2.5La alloy. The coefficient of thermal expansion (CTE) was slightly improved by the addition of nanoparticles. The results of the damping measurement revealed that the damping capacity of the Mg-3Al-2.5La alloy increased due to the presence of Y 2 O 3 . The compression results showed that the addition of Y 2 O 3 to Mg-3Al-2.5La improved the compressive yield strength (from~141 MPa to~156 MPa) and the ultimate compressive strength (from~456 MPa to~520 MPa), which are superior than those of the Mg-3Al alloy (Compressive Yield Strength, CYS~154 MPa and Ultimate Compressive Strength, UCS~481 MPa). The results further revealed that there is no significant effect on the fracture strain value of Mg-3Al-2.5La due to the addition of Y 2 O 3 .

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Section: Microstructural Characterizationsupporting

confidence: 82%

Section: Microstructural Characterizationsupporting

confidence: 81%

Improved Compressive, Damping and Coefficient of Thermal Expansion Response of Mg–3Al–2.5La Alloy Using Y2O3 Nano Reinforcement

Kumar

Tun

Kohadkar

et al. 2017

Metals

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“…The high melting point of these compounds and, thus, their high thermal stability are believed to be responsible for the improved creep resistance of the Mg-Al-Ca [9][10][11] and Mg-Al-RE alloys. [12,13] Similar to Ca and RE, some transition elements such as Zr have high affinity for Al to form Al-Zr compounds. The high thermal stability of these intermetallics may make them a suitable choice for hightemperature applications.…”

Section: Introductionmentioning

confidence: 99%

Effects of Zr Additions on the Microstructure and Impression Creep Behavior of AZ91 Magnesium Alloy

Kabirian

Mahmudi

2010

Metall Mater Trans A

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The effects of 0.2, 0.6, and 1.0 wt pct Zr additions on the microstructure and creep behavior of AZ91 Mg alloy were investigated by impression tests carried out under constant punching stress (r imp ) in the range 100 to 650 MPa, corresponding to the modulus-compensated stress levels of 0:007 r imp G 0:044, at temperatures in the range 425 K to 570 K (152°C to 297°C). The alloy containing 0.6 wt pct Zr showed the best creep resistance mainly due to the favorable formation of Al 3 Zr 2 and Al 2 Zr intermetallic compounds, reduction in the volume fraction of the eutectic b-Mg 17 Al 12 phase, and solid solution hardening effects of Al in the Mg matrix. Based on the obtained stress exponents of 4.2 to 6.5 and activation energies of 90.7 to 127.1 kJ/mol, it is proposed that two parallel mechanisms of lattice and pipe-diffusion-controlled dislocation climb compete. Dislocation climb controlled by dislocation pipe diffusion prevails at high stresses, whereas climb of edge dislocations is the controlling mechanism at low stresses.

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“…Owing to high thermal stability of mischmetal compound, the addition of La and Ce can increase the hardness, strength and corrosion-resistant of Mg alloys [18][19][20] . In related studies, Jain and Pettersella [21,22] revealed that the significant improvement in the high-temperature tensile creep properties of Mg-Al alloys is due to the formation of the fine rod-like Al 11 RE 3 compound having high thermal stability in the alloys. Moreover, it was reported that the addition of Mm improved slightly the corrosion resistance of AZ91 alloys compared with the addition of Ca [23] .…”

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confidence: 99%

Effect of Mischmetal on Microstructure and Mechanical Properties of Superlight Mg-Li Alloys

Yangmin

Peng

et al. 2017

Rare Metal Materials and Engineering

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The influence of mischmetal (lanthanum and cerium) on the microstructure and mechanical properties of Mg-9Li-3Al-xRE (x=0, 0.5, 1, 1.5, 2, wt%) alloys was investigated by optical microscope, scanning electron microscope (SEM) with an energy dispersive spectroscope (EDS), and X-ray diffraction (XRD). In as-cast alloys, Al4RE phase is formed, the content of Mg17Al12 phase and the volume fraction of α-Mg phase decrease. In addition, α-Mg phase is refined and the mechanical properties of Mg-9Li-3Al-xRE alloys are improved. However, with increasing mischmetal content, the size of Al4RE phase increases and the mechanical properties decrease. In extruded alloys, Al4RE phase is broken into the particles of 1~3 μm in the β-Li matrix phase and α/β interphase. And the best mechanical properties are obtained for Mg-9Li-3Al-1.5RE alloy with a tensile strength of 228.3MPa and elongation of 20.8%, increased by 88.6% and 197.4%, respectively, compared with as-cast Mg-9Li-3Al alloy.

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

Cited by 10 publications

References 25 publications

Improved Compressive, Damping and Coefficient of Thermal Expansion Response of Mg–3Al–2.5La Alloy Using Y2O3 Nano Reinforcement

Improved Compressive, Damping and Coefficient of Thermal Expansion Response of Mg–3Al–2.5La Alloy Using Y2O3 Nano Reinforcement

Effects of Zr Additions on the Microstructure and Impression Creep Behavior of AZ91 Magnesium Alloy

Effect of Mischmetal on Microstructure and Mechanical Properties of Superlight Mg-Li Alloys

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