The evolution of coarse grains and its effects on weakened basal texture during annealing of a cold-rolled magnesium AZ31B alloy

Wang, Xin; Guan, Dawei

doi:10.1016/j.jma.2021.08.026

Cited by 22 publications

(7 citation statements)

References 26 publications

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“…The above extruded alloys both showed a two-peak texture with peaks tilting towards ED, which was similar to the rolled Mg-Zn-RE alloys [10]. However, both of the as-rolled and as-annealed alloys in the present study still showed a strong basal texture (Figure 5) rather than the reported two-peak texture, and the texture intensity was comparable to the commercial rolled AZ31 alloys [32]. Considering the dramatic texture change in Mg-Zn alloys with trace RE or Ca addition, and the sluggish texture modification in the Mg-3Sn-0.1Ca-xMM alloys, it can be deduced that MM does not weaken the texture of Mg-3Sn-0.1Ca alloys, although the texture intensity decreased with the increasing MM addition and further decreased during the annealing treatment.…”

Section: Effect Of MM Addition On the Microstructure And Texture Of T...supporting

confidence: 68%

Effect of Mischmetal Addition on Microstructure and Mechanical Properties of As-Cast and As-Rolled Mg–Sn–Ca Alloys

Luo,

Dong,

Zhong

et al. 2023

Crystals

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The microstructures and mechanical properties of Mg–3Sn–0.1Ca–xMM (mischmetal, x = 0.3, 0.6, and 0.9 wt.%) alloys were investigated. Optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction spectroscopy (XRD) were used to characterize the microstructures and phase constitutions of the cast and rolled alloys. Room temperature tensile tests were conducted to obtain the mechanical properties and macro-textures to evaluate the texture weakening effect results of the MM. The results show that an abundance of second phase formed, confirmed as the (Ca,MM)MgSn phase, and the volume fraction increased with the increasing MM addition. The tensile yield strength of the as-cast alloys increased with the MM addition, but the elongation decreased. All of the rolled Mg–3Sn–0.1Ca–xMM alloys showed a strong basal texture, and only slightly decreased in intensity after annealing treatment due to the particle-stimulated nucleation of recrystallization. The as-annealed Mg–3Sn–0.1Ca–0.6MM alloys exhibited the highest tensile strengths of 266.5 ± 3.3 MPa and 136.1 ± 3.7 MPa, which are mainly ascribed to grain refinement strengthening, Orowan strengthening and texture strengthening.

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Section: Effect Of MM Addition On the Microstructure And Texture Of T...supporting

confidence: 68%

Effect of Mischmetal Addition on Microstructure and Mechanical Properties of As-Cast and As-Rolled Mg–Sn–Ca Alloys

Luo,

Dong,

Zhong

et al. 2023

Crystals

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“…Then, the rapid grain growth would be driven by the consuming of deformed parent grain P1 and further resulted in the same basal texture as the parent grain P1. This SRX mechanism may be named the abnormal sub-grain growth (AsGG), which was reported in an AZ31B alloy by Wang and Guan [13]. With the boundary migration process going on, coarse grains were generated, which was in response to the weakening RD-rotated texture intensity after post-annealing.…”

Section: Static Recrystallization Via Twinsmentioning

confidence: 87%

“…It was clear that the microstructure consisted of fine equiaxial grains with the average size of 10.7 ± 4.2 μm. The grain orientation was characterized by a strong {0002} basal texture with the peak intensity of ~ 9.1, which was the typical rolling texture for deformed Mg alloy with the < c > axis of most grains paralleling to the ND [13]. In addition, nearly none of the twin boundaries were observed (Fig.…”

Section: Hot-rolled Statementioning

confidence: 99%

Tailoring the Texture and Mechanical Properties of Textured-AZ31 Mg Alloy Sheets by Twinning and Recrystallization

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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In this study, a method of corrugated width limit alignment processes (CWLA) was applied to pre-twin in hot-rolled Mg alloy sheets. The microstructure evolution and mechanical properties of the CWLA sheets were studied. The results demonstrated that the grain orientation was transformed from strong basal texture to RD-rotated texture after CWLA treatment and up to 22.2% of {10-12} tensile twin boundaries were produced in the microstructure. The 60 ± 5° < 10-10 > twin variant pairs were dominant in the twinned microstructure. Two kinds of dynamic recrystallization (DRX) mechanism, i.e., continuous DRX (CDRX) at low-temperature CWLA and the discontinuous DRX (DDRX) at high-temperature condition were observed. After post-annealing, the twin-induced static recrystallization (SRX) and abnormal grain growth were observed in the CWLA samples, and most twin boundaries were retained. After CAWL for 60 min at 300 °C and post annealing, an improvement on plasticity and strength were achieved with 55% increment for uniform elongation (UE) and 10% increment for ultimate tensile strength (UTS).

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“…115 Also, the annealing effect caused due to higher heat input leads to the coarser grain size of the final microstructure. 116,117 However, it is much more important to state that the pinning effect is considered an added factor affecting NZ's grain size. This factor is influential only when the particle reinforcement technique is involved.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Understanding the effect of particle reinforcement on friction stir weldment: A review

ShivaKumar

Rajamurugan

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Friction stir welding is a solid-state environment-friendly joining process with many advantages over all fusion welding processes. Many variants in friction stir welding are used for uplifting the process to its maximum possible extent. One such variant is particle reinforcement in the weldment, which is used for improving the mechanical properties by enhancing the metallurgical aspects in the weld region. Generally, micro- and nano-sized ceramic particles are used for reinforcing, which have a much higher melting point than the materials to be joined. From the literature studies, particle size plays a prominent role in attaining better mechanical properties in reinforcing techniques. In addition, an increase in particle size decreases the corresponding mechanical property. Higher heat input conditions like higher tool rotational speed and low welding speed are preferred as they better mix reinforced particles with the matrix material in the weld zone. However, the higher input conditions in the regular friction stir welding process coarsen the grains, thereby deteriorating the mechanical properties of the joint. Increasing the number of passes and switching the direction between the passes leads to uniform distribution of particles and enhance the mechanical properties. This review article's main aim is to understand better reinforcement particles in the weld line of a friction stir welding process. Also, the author emphasizes reinforcing the combination of nano and microparticles to reduce the cost of reinforcement without compromising the mechanical properties. The work mentioned above is missing in the open literature.

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The evolution of coarse grains and its effects on weakened basal texture during annealing of a cold-rolled magnesium AZ31B alloy

Cited by 22 publications

References 26 publications

Effect of Mischmetal Addition on Microstructure and Mechanical Properties of As-Cast and As-Rolled Mg–Sn–Ca Alloys

Effect of Mischmetal Addition on Microstructure and Mechanical Properties of As-Cast and As-Rolled Mg–Sn–Ca Alloys

Tailoring the Texture and Mechanical Properties of Textured-AZ31 Mg Alloy Sheets by Twinning and Recrystallization

Understanding the effect of particle reinforcement on friction stir weldment: A review

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