Development of extruded Mg-6Er-3Y-1.5Zn-0.4Mn (wt.%) alloy with high strength at elevated temperature

Zhang, Mingquan; Feng, Yan; Zhang, Jinghuai; Liu, Shujuan; Yang, Qiang; Liu, Zhuang; Li, Rongguang; Meng, Jian; Wu, Ruizhi

doi:10.1016/j.jmst.2019.05.053

Cited by 41 publications

(7 citation statements)

References 55 publications

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“…Based on the corresponding SAED patterns ( Figure 8 b,c), these phases are identified as Mg 3 RE (face-centered cubic structure, a = 0.740 nm) and 14H LPSO phases (an ordered hexagonal structure, a = 1.112 nm, c = 3.647 nm) [ 26 , 27 ], respectively. Besides, the polygonal phase (point C) and lamellar structure (point D) ( Figure 8 d) formed in the grain interior are confirmed as Al 2 RE phase (face-centered cubic structure, a = 0.788 nm) and stacking faults (SFs) [ 28 , 29 ], respectively ( Figure 8 e,f).…”

Section: Resultsmentioning

confidence: 91%

Effect of Al Addition on Grain Refinement and Phase Transformation of the Mg-Gd-Y-Zn-Mn Alloy Containing LPSO Phase

et al. 2022

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The effect of 0–1.0 at.% Al additions on grain refinement and phase transformation of the Mg-2.0Gd-1.2Y-0.5Zn-0.2Mn (at.%) alloy containing a long period stacking ordered (LPSO) phase was investigated in this work. The addition of Al promoted the formation of the Al2RE phase in the Mg-2.0Gd-1.2Y-0.5Zn-0.2Mn (at.%) alloy, and the dominant secondary phases in the as-cast Mg-2.0Gd-1.2Y-0.5Zn-0.2Mn-1.0Al (at.%) alloy were the Mg3RE phase, LPSO phase, and Al2RE phase. With increased Al addition, the area fraction of the Al2RE phase increased monotonously, while the area fraction of LPSO phase and Mg3RE phase decreased gradually. The orientation relationship between the Al2RE phase and the α-Mg matrix was determined to be <112>Al2RE//<112¯0>α-Mg, {101}Al2RE//{101¯0}α-Mg, which was not affected by Zn and Mn concentrations in the Al2RE phase. Since the Al2RE particles with a size more than 6 μm located at the center of grains could act as nucleants for α-Mg grains, the average grain size of the as-cast alloys decreased from 276 μm to 49 μm after 1.0% Al addition. The effect of the Al addition on the grain refinement of the Mg-2.0Gd-1.2Y-0.5Zn-0.2Mn alloy was comparable to that of the Zr refined counterpart.

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Section: Resultsmentioning

confidence: 91%

Effect of Al Addition on Grain Refinement and Phase Transformation of the Mg-Gd-Y-Zn-Mn Alloy Containing LPSO Phase

et al. 2022

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“…According to the reports so far and our preliminary experiments, the main intermetallic phases in both Mg-4Y-2Er-2Zn and Mg-8Y-4Er-4Zn alloys would be LPSO structural Mg 12 (Y,Er) 1 Zn 1 or Mg 10 (Y,Er) 1 Zn 1 phases [22]. However, this study indicates that LPSO structure cannot be formed in Mg-Li-Y-Er-Zn alloys after the addition of 11% Li.…”

Section: Discussionmentioning

confidence: 99%

“…At present, it is well-known that the addition of rare earth (RE) can effectively enhance the strength and heat resistance of Mg alloys, thus forming typical Mg–RE series and Mg–RE–Zn series alloys [17,18,19,20,21]. Our latest research results show that Mg-Y-Er-Zn extruded alloys have excellent strength both at room and high temperatures mainly due to the formation of a long-period stacking ordered (LPSO) structure or stacking faults [22,23]. Moreover, the influence of RE combined with Zn on some Mg-Li alloys has also been studied and good results have been obtained.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Y/Er and Zn Addition on the Microstructure and Mechanical Properties of Mg-11Li Alloy

Zhang

et al. 2019

Materials

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Although body-centered cubic (BCC) structural magnesium–lithium (Mg-Li) alloys have lower density and better formability than common hexagonal close-packed (HCP) Mg alloys, their applications remain limited due to their low strength. The purpose of this study is to investigate the effect of Y/Er and Zn addition on the microstructure and tensile properties of Mg-11Li alloy with a BCC structural matrix by comparing Mg-11Li, Mg-11Li-4Y-2Er-2Zn, and Mg-11Li-8Y-4Er-4Zn (wt %) alloys. The results indicate that the addition of Y/Er and Zn at a ratio of 3:1 cannot promote the formation of long-period stacking ordered structure in Mg-11Li alloy such as that in Mg-Y-Er-Zn alloys and the dominant intermetallic phases formed are BCC Mg24RE5 and face-centered cubic (FCC) Mg3RE2Zn3 phases. With an increase of the content of Y/Er and Zn in an as-cast alloy, the fraction of intermetallic particles increases and the grain size decreases. The addition of Y/Er, as well as Zn, dramatically promotes the refinement of dynamic recrystallization (DRX) during extrusion. The initial intermetallic phases induced by Y/Er and Zn addition are broken into relatively fine particles during extrusion, and this contributes to refining the dynamic recrystallized (DRXed) grains mainly by the particle stimulated nucleation mechanism. The as-extruded Mg-11Li-4Y-2Er-2Zn and Mg-11Li-8Y-4Er-4Zn alloys exhibit much higher tensile strength as compared with as-extruded Mg-11Li alloy, which is mainly ascribed to the refined DRXed grains and numerous dispersed intermetallic phase particles. It is suggested that further refinement of intermetallic particles in these extruded Mg-11Li-based alloys may lead to higher quality alloy materials with low density and excellent mechanical properties.

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“…Fig. 6(h-j) in detail shows that a serial of lamellar structure with a large aspect ratio generated within the individual matrix grains, implying that high density of the basal plane stacking faults (SFs) existed due to the relatively low stacking fault energy (SFE) in Mg-RE alloys [46]. The corresponding atomic IFFT image in Fig.…”

Section: Tem Observationsmentioning

confidence: 98%

Combining gradient structure and supersaturated solid solution to achieve superior mechanical properties in WE43 magnesium alloy

Sun

et al. 2022

Journal of Materials Science & Technology

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Development of extruded Mg-6Er-3Y-1.5Zn-0.4Mn (wt.%) alloy with high strength at elevated temperature

Cited by 41 publications

References 55 publications

Effect of Al Addition on Grain Refinement and Phase Transformation of the Mg-Gd-Y-Zn-Mn Alloy Containing LPSO Phase

Effect of Al Addition on Grain Refinement and Phase Transformation of the Mg-Gd-Y-Zn-Mn Alloy Containing LPSO Phase

The Effect of Y/Er and Zn Addition on the Microstructure and Mechanical Properties of Mg-11Li Alloy

Combining gradient structure and supersaturated solid solution to achieve superior mechanical properties in WE43 magnesium alloy

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