Development of high mechanical properties and moderate thermal conductivity cast Mg alloy with multiple RE via heat treatment

Li, Guoqiang; Zhang, Jinghuai; Wu, Ruizhi; Feng, Yan; Liu, Shujuan; Wang, Xiaojun; Jiao, Yufeng; Yang, Qiang; Meng, Jian

doi:10.1016/j.jmst.2017.12.011

Cited by 94 publications

(12 citation statements)

References 47 publications

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“…These LAGBs then progressively rotate, such that the misorientation increases continuously and, subsequently, HAGBs form. However, if the deformation was not enough, the fragmentation of coarse grain did not occur completely, which finally led to some remaining coarse grains [ 27 ]. Further observations on the 200 °C sheets could reveal that the fractions of these coarse grains decreased with the increase of thickness reduction.…”

Section: Resultsmentioning

confidence: 99%

“…Since basal slip was the main deformation mode in magnesium alloys, due to its lower CRSS [ 34 ], they would gradually rotate toward the rolling plane under the combined effect of compression stress along the ND, and tension stress along the RD. Moreover, many studies had demonstrated that the occurrence of DRX mainly affected the rotation of crystal orientation, without causing the deflection of basal plane [ 9 , 27 , 33 ]. In other words, the final strong basal texture formed in the hot rolling process was primarily dependent on the texture state after deformation.…”

Section: Resultsmentioning

confidence: 99%

“…More specifically, the subgrains would inherit some characteristics of <11-20>//RD texture arising from DRXed grain, despite producing a slight transformation as the deformation proceeded. For deformed grains, many studies have demonstrated that their <10-10> would gradually rotate toward the RD [ 5 , 6 , 27 ]. Therefore, by superposition of the texture components above, the subgrain and deformed grain region exhibited the coexistence of <10-10>//RD texture and <11-20>//RD texture.…”

Section: Resultsmentioning

confidence: 99%

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Critical Rolling Process Parameters for Dynamic Recrystallization Behavior of AZ31 Magnesium Alloy Sheets

et al. 2018

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In this work, the influence of various rolling temperatures and thickness reductions on the dynamic recrystallization (DRX) behavior of AZ31 magnesium alloy sheets was investigated. Meanwhile, the texture variation controlled by DRX behavior was analyzed. Results suggested that, with the help of DRX behavior, reasonable matching of rolling temperature and thickness reduction could effectively refine the grain size and improve the microstructure homogeneity. Using the grain refinement and microstructure homogeneity as the reference, the critical rolling process parameters were 400 °C—30%, 300 °C—30%, and 250 °C—40% in the present work. In terms of basal texture variation, the occurrence of twins produced the largest maximum texture intensity. However, for the sheets with DRX behavior, the maximum texture intensity decreased sharply, but would steadily increase with the growth of DRXed grain. Additionally, for DRXed grains, the <11-20>//RD (RD: rolling direction) grains would gradually annex the <10-10>//RD grains with the growth of DRXed grains, which finally made their texture component become the dominant texture state. However, when the deformation continued, the <10-10> in DRXed grains would rotate toward the RD again. Weighted by the fracture elongation of AZ31 magnesium alloy sheet, the critical thickness reductions were 30–40% under the rolling temperature of 400 °C.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Critical Rolling Process Parameters for Dynamic Recrystallization Behavior of AZ31 Magnesium Alloy Sheets

et al. 2018

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“…Mg alloys, known as “the green engineering materials for the 21st century”, have the characteristics of high specific strength, excellent damping, easy recycling, etc., and have therefore attracted more and more attention for their application in lightweight designs in the automotive, aerospace, and electronic industries [2,3,4,5,6,7]. However, common Mg alloys also have their own weaknesses, such as low absolute strength, especially at elevated temperature, which is one of the reasons why Mg alloys have not been widely used [8,9,10]. At present, the popular commercial Mg alloys, such as the AZ, AM, and ZK series, are of room temperature (RT) Mg alloys whose strength is moderate at RT, while deteriorates sharply with increasing temperatures [11].…”

Section: Introductionmentioning

confidence: 99%

Development of Hot-Extruded Mg–RE–Zn Alloy Bar with High Mechanical Properties

Zhang

Feng

et al. 2019

Materials

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A new elevated-temperature high-strength Mg–4Er–2Y–3Zn–0.4Mn (wt %) alloy was developed by semi-continuous casting, solid solution treatment, and hot extrusion. W phase (Mg3(Er,Y)2Zn3) with fcc structure, long period stacking ordered phases with 18R (Mg10(Er,Y)1Zn1) and 14H (Mg12(Er,Y)1Zn1) structures, and basal plane stacking faults (SFs) was formed in the as-cast alloy, mainly due to the alloy component of (Er + Y)/Zn = 1:1 and Er/Y = 1:1 (at %). After solid solution treatment and hot extrusion, the novel microstructure feature formed in as-extruded alloy is the high number-density nanospaced basal plane SFs throughout all the dynamically recrystallized (DRXed) and un-DRXed grains, which has not been previously reported. The as-extruded alloy exhibits superior tensile properties from room temperature to 300 °C. The tensile yield strength can be maintained above 250 MPa at 300 °C. The excellent elevated-temperature strength is mainly ascribed to the formation of nanospaced basal plane SFs throughout the whole Mg matrix, fine DRXed grains ~2 μm in size, and strongly basal-textured un-DRXed grains with profuse substructures. The results provide new opportunities for the development of deformed Mg alloys with satisfactory mechanical properties for high-temperature services.

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“…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].…”

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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Development of high mechanical properties and moderate thermal conductivity cast Mg alloy with multiple RE via heat treatment

Cited by 94 publications

References 47 publications

Critical Rolling Process Parameters for Dynamic Recrystallization Behavior of AZ31 Magnesium Alloy Sheets

Critical Rolling Process Parameters for Dynamic Recrystallization Behavior of AZ31 Magnesium Alloy Sheets

Development of Hot-Extruded Mg–RE–Zn Alloy Bar with High Mechanical Properties

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

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