Study on the assemblage of Y and Gd on microstructure and mechanical properties of hot extruded Mg–Al–Zn alloy

Bu, Fanqiang; Yang, Qiang; Qiu, Xin; Tian, Zheng; Zhang, Deping; Niu, Xiaodong; Li, Yangde; Liu, Xiaojuan; Meng, Jian

doi:10.1016/j.msea.2015.05.008

Cited by 32 publications

(7 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Firstly, grain refinement is an important factor in simultaneously improving the material strength and plasticity. It is well known that the effect of grain size on material strength follows the Hall–Petch relation:σ y = σ 0 + Kd −1/2 , where σ y is the YS, σ 0 is the material constant, K is Hall–Petch slope, and d is the average grain size [39,40]. However, for the K value of HCP structure materials (K Mg = 280–320 MPa μm −1/2 ), it is much higher relative to materials with body-centered cubic (BCC) or face-centered cubic (FCC) structures.…”

Section: Resultsmentioning

confidence: 99%

An Investigation on Microstructure, Texture and Mechanical Properties of AZ80 Mg Alloy Processed by Annular Channel Angular Extrusion

Zhao

Xue

et al. 2019

Materials

View full text Add to dashboard Cite

Annular channel angular extrusion has been recently developed as a new single-pass severe plastic deformation method suitable for producing large size cup-shaped parts from cylindrical billets. In this study, the novel technology was successfully applied to commercial AZ80 Mg alloy at 300 °C, and microstructure, texture evolution, and mechanical properties were investigated. Due to severe shear deformation, the initial microstructure, including the coarse grains and large eutectic β-phases, was greatly refined. The strong basal texture formed during the initial deformation stage was modified into a weak tilted dynamic texture. During the deformation process, fine β-particles separated from eutectic phases effectively hindered the grain boundary migration and rotation, enhancing the grain refinement and texture weakening. More than 63% of the microhardness increase was achieved in this extruded part. Also, tensile tests showed the yield strength and elongation in both directions (transverse and longitudinal) of extruded part were improved more than 2.5 times, and the ultimate tensile strength was improved more than 2 times, compared to the initial material state. The improved material properties were mainly attributed to microstructure (grain and phase) refinement and texture weakening. It was demonstrated that the annular channel angular extrusion process can be considered as a novel and effective single-pass severe plastic deformation method.

show abstract

Section: Resultsmentioning

confidence: 99%

An Investigation on Microstructure, Texture and Mechanical Properties of AZ80 Mg Alloy Processed by Annular Channel Angular Extrusion

Zhao

Xue

et al. 2019

Materials

View full text Add to dashboard Cite

show abstract

“…Global warming is becoming one of the most serious environmental problems in recent years, and automobile manufacturers worldwide are making efforts to meet the rising environmental regulations and product standards [1,2]. Therefore, lightweight car body designs to satisfy the fuel economy and emission control standards for automobiles have been gaining increasing attentions [3][4][5]. As one of the lightest metallic structural metal with high specific strength and stiffness, magnesium alloys have been widely applied in automobile industry [6].…”

Section: Introductionmentioning

confidence: 99%

Rheological Solidification Behavior and Mechanical Properties of AZ91-Sn Alloys

et al. 2019

View full text Add to dashboard Cite

The solidification and tensile deformation behaviors of rheo-cast AZ91-Sn alloys were revealed to study the effects of Sn alloying on improvement of AZ91 alloy’s mechanical properties. Two kinds of Mg17Al12 phases precipitated from the supersaturated magnesium matrix during rheo-solidification were observed: coarse discontinuous precipitates (DP) at grain boundaries and small-sized continuous precipitates (CP) inside grains. With increasing Sn content, the amount of Mg17Al12 phases was increased whilst the amount of Al atoms in the matrix was decreased. Due to the higher melting point of Mg2Sn than Mg17Al12, Mg2Sn precipitated earlier from the melt, and therefore provided heterogeneous nuclei for Mg17Al12 during the eutectic reaction. Due to grain refinement and solid solution strengthening, AZ91-2.4Sn (mass%) gained 52% increase in tensile strength and 93% increase in elongation compared with pure AZ91 alloy. The higher-density twins and microcracks induced by Sn alloying relaxed stress concentration during plastic deformation, so the fracture mode was transformed from cleavage fracture of pure AZ91 alloy to ductile fracture of AZ91-Sn alloys.

show abstract

“…As a result, their applications as the main load‐bearing structural materials and heat‐resistant structural materials are limited. Magnesium alloys with high strengths and toughness could be acquired by heavy alloying of heavy rare‐earth elements at present; however, it could lead to high costs of materials, which could further increase the difficulties of their popularizations and applications in civil transportations …”

Section: Introductionmentioning

confidence: 99%

The Role of Sm in Precipitates, Grain Sizes,and Tensile Properties of As‐Cast and As‐Extruded AZ31–0.3La Alloys

et al. 2019

Adv Eng Mater

View full text Add to dashboard Cite

Herein, the effect of Sm on precipitates, grain sizes, and tensile properties of AZ31-0.3La alloy is investigated. Results indicate that Sm is almost dissolved in α-Mg matrix with 0.2% content, whereas Al 2 Sm with two kinds of morphologies forms with further Sm addition. The grain sizes of as-cast studied alloy increase first and then decrease with increasing Sm addition, whereas the dynamic recrystallization (DRX) grain sizes decrease first and then increase, and the DRX grain size distribution is uniform first and then uneven. During the hot extrusion process, the refinement of DRXed grains is attributed to the particle-stimulated nucleation (PSN) mechanism. The R p0.2 (yield strength) of as-extruded studied alloy is changed from twin-dominated to slip-dominated by 0.2% Sm addition, and the basal texture is slightly weakened due to the refined DRX grains and even-distributed grain size distribution, and the minor solute Sm atoms segregating at grain boundaries. Finally, the R p0.2 of the as-extruded AZ31-0.3La alloy is gradually enhanced with increasing Sm addition, and the A (elongation) is increased to 25% with 0.2% Sm addition and maintains to about 20% with 0.6-1.7% Sm addition.

show abstract

Study on the assemblage of Y and Gd on microstructure and mechanical properties of hot extruded Mg–Al–Zn alloy

Cited by 32 publications

References 38 publications

An Investigation on Microstructure, Texture and Mechanical Properties of AZ80 Mg Alloy Processed by Annular Channel Angular Extrusion

An Investigation on Microstructure, Texture and Mechanical Properties of AZ80 Mg Alloy Processed by Annular Channel Angular Extrusion

Rheological Solidification Behavior and Mechanical Properties of AZ91-Sn Alloys

The Role of Sm in Precipitates, Grain Sizes,and Tensile Properties of As‐Cast and As‐Extruded AZ31–0.3La Alloys

Contact Info

Product

Resources

About