Effect of large thickness-reduction on microstructure evolution and tensile properties of Mg-9Al-1Zn alloy processed by hard-plate rolling

The AZ31/GW103K bimetallic composite plates were prepared by co-extrusion of diff erent combination types (sandwich extrusion type and double semicircle extrusion type), and eff ects of diff erent extrusion combination types on the microstructure and mechanical properties of bimetallic composite plates were systematically investigated. The results show that both the AZ31/GW103K bimetallic composite plates prepared by diff erent extrusion combination types have good metallurgical bonding, and changing the combination type does not aff ect the thickness of the interfacial transition layer of composite plates. Compared with the monolithic AZ31 and GW103K extruded plates, co-extrusion can promote the dynamic recrystallization (DRX) of AZ31 and GW103K components in composite plates, and double semicircular extrusion type has a better promotion eff ect on the DRX than sandwich extrusion type. In addition, the texture of AZ31 in both monolithic AZ31 and AZ31/GW103K/AZ31 (A/G/A) plates is a typical (0002) basal texture, while that in the AZ31/GW103K (A/G) composite plate shifts to the tangent direction (TD) of extruded plate. Compared with the monolithic AZ31 extruded plate, both the yield strength and tensile strength of A/G and A/G/A bimetallic composite plates are signifi cantly improved. The strength of A/G/A composite plate is higher than that of A/G composite plate, but its elongation is worse. Meanwhile, co-extrusion reduces the dislocation density of AZ31 and GW103K components in composite plates, and diff erent extrusion combination types also aff ect the dislocation density.

Section: Introductionmentioning

confidence: 99%

Effect of Extrusion Combination Types on Microstructure and Mechanical Properties of the AZ31/GW103K Bimetallic Composite Plates

Meng

Lin

Wang

et al. 2022

“…7 was calculated. The GND can be calculated by ρ ≈ θ/(bδ) (where θ is the accumulated misorientation angle in radians within a distance δ and b is the Burgers vector) according to Li et al [33]. Taking [34].…”

Section: Calculation Of Geometrically Necessary Dislocationmentioning

confidence: 99%

Dynamic Recrystallization Mechanism and Texture Evolution during Interactive Alternating Extruded Magnesium Alloy

Gao

Feng

et al. 2023

Alternating extrusion (AFE) is a new way to effectively alter the texture and enhance the mechanical properties of the extruded bars. However, the mechanisms of microstructure evolution and enhancement of hardness are still unknown by different extrusion ratios (ERs) during extrusion. This work systematically investigated the microstructure and hardness of AZ31 alloy with various extrusion ratios of 8.1, 15.6, and 24.8 by electron backscattered diffraction. The most striking result to emerge from the data is that when the ERs were increased from 8.1 to 15.6, the grain size was refined to 7.13 μm. However, when the ER reached 24.8, the average grain size was 11.43 μm. The proportion of recrystallization was only 2.92%, there was a continuous rotation of sub-grains at coarse grain boundaries, and non-basal slip < a > dislocations were activated and enriched near low-angle grain boundaries. At present, the recrystallization has not been completed. The grains of the product are coarsened, and the hardness is reduced. When λ = 15.6, the AFE has a significant grain refinement effect and the highest hardness value.

“…Therefore, basement slip mainly occurs in the process of deformation. The energy required for recrystallization can be provided by substrate slip [41]. The substrate slip Schmid coefficient of microstructure is high, mainly distributed between 0.3 and 0.5 (Fig.…”

Section: Recrystallizationmentioning

confidence: 99%

Microstructure Characteristics and Corrugation Interface Behavior of Al/Mg/Al Composite Plate Rolled Under Large Strain

HUO

Feng

Niu

et al. 2022

Traditional rolled (TR) aluminum (Al)/magnesium (Mg)/aluminum (Al) composite plates have many bottlenecks such as multiple passes, low interlaminar strength, and weak mechanical properties. In this paper, the hard-plate rolling (HPR) method was used to prepare Al/Mg/Al composite plates under a single pass reduction of 60%. The results show that the ultimate tensile strength (UTS) of the composite plate obtained by hard-plate rolling is 262.3 MPa, and the percentage of total elongation at fracture (A t ) is 12.3%, which is 31.6% and 37.4% higher than that of the traditional rolling, respectively. It is attributed to the unique corrugated interlocking structure of the interface of the composite plate caused by hard-plate rolling. The shear texture produced by the Mg plate weakens the strong-basal texture. At the same time, the strong basal slip and the large amount of energy stored in the deformed grains provide favorable conditions for dynamic recrystallized (DRX) nucleation. The microstructure is deeply refined by DRX, and the strength and plasticity of the composite plate are improved synchronously. It provides scientific guidance for the development of high-performance lightweight composite plates and the research on hard-plate rolling technology and also has good industrial production and application potential.