Dependence of Microstructure and Hardening Behavior on Torsion Strain and Strain Rate in Extruded AZ31 Rods

Chen, Hongbing; Liu, Tianmo; Yu, Huimin; Song, Bo; Hou, Dewen; Guo, Ning; He, Jiejun

doi:10.1002/adem.201600219

Cited by 14 publications

(4 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The growing interest in energy conservation and emission reduction improves the utilisation of these lightweight alloys and then continues raising the requirements in understanding their mechanical properties [6][7][8][9]. Many reports studied the compression [8], tension [7,10,11], pre-deformation [1,12,13] and impact mechanical responses [8,14] of such materials. These contributions help a lot on constructing the constitutive model of Mg alloy which helpful to provide accurate predictions on stress-strain and forcedisplacement responses [7,15,16].…”

mentioning

confidence: 99%

Deformation responses of AZ31B magnesium alloy under combined shear-compression loading

Lin

Shao

et al. 2023

Materials Science and Technology

View full text Add to dashboard Cite

Combined shear-compression tests were conducted to AZ31B magnesium alloy through shear-compression specimen (SCS) and the deformation response process is captured by digital image correlation technology. The mechanical behaviours and deformation characteristics of SCS with different loading angles are analysed in detailed. Results show that the strain path of SCS is sensitive to the loading angle. The deformation behaviour at initial stage exhibits proportional loading and related to the tangent loading angle which reveals the designability of SCS for mechanical testing with specific requirements.

show abstract

mentioning

confidence: 99%

Deformation responses of AZ31B magnesium alloy under combined shear-compression loading

Lin

Shao

et al. 2023

Materials Science and Technology

View full text Add to dashboard Cite

show abstract

“…The texture rotated in this study is identical to that reported in refs. [21,28]. Beausir et al [29] indicated that the ideal orientation of texture for extruded Mg alloys during torsion deformation is the B-fiber texture with the c-axis//ED.…”

Section: Microstructure Of the Free-end Torsion Samplementioning

confidence: 99%

Influence of Pre-Tension on Free-End Torsion Behavior and Mechanical Properties of an Extruded Magnesium Alloy

Chen,

Shen,

Song

et al. 2023

Materials

Self Cite

View full text Add to dashboard Cite

In this study, the influence of pre-tension on free-end torsion behavior and compression mechanical properties and micro-hardness of an extruded AZ31 Mg alloy was investigated using electron backscatter diffraction (EBSD), compression testing and micro-hardness testing. The result indicates that pre-tension can cause significant dislocation strengthening, which can increase the torsion yield strength and make the shear stress–shear strain curve of the pre-tension sample almost parallel to that of the as-extruded sample during plastic deformation stage. Texture in edge position on the cross-section of both the pre-tension and as-extruded samples can be rotated towards the extrusion direction by about ~30° by free-end torsion. The Swift effect is mainly responsible for the occurrence of massive extension twins in the central region. In contrast, normal stress is the main cause of extension twins occurring in the edge region. However, the effect of extension twins on micro-hardness is less than that of dislocations. The micro-hardness of both free-end torsion specimens increases almost linearly with increasing distance from center to edge on the cross-section. Nevertheless, the increase in micro-hardness of the pre-tension and then torsion sample is inconspicuous because pre-tension leads to dislocation proliferation and dislocation accumulation saturation. The result also indicates that both pre-tension and free-end torsion can lead to dislocation strengthening, which can obviously increase the micro-hardness and compressive yield stress. The underlying mechanisms were explored and discussed in detail.

show abstract

“…In recent years, Guo et al [8,16] have pointed out that torsion processing is not only a common material fatigue test method, but an efficient strategy to prepare a quantitative controlled gradient structure for rod-shaped parts. High-performance gradient structural materials can be prepared by controlling torsion path [14,17], torsion speed [18], and the combined annealing process [19,20]. Recently, we have developed a new method to introduce a gradient of martensite phase in austenitic steels, with a volume fraction increasing from core to surface, via free-end torsion (FET).…”

Section: Introductionmentioning

confidence: 99%

Effect of Shear Strain Rate on Microstructure and Properties of Austenitic Steel Processed by Cyclic Forward/Reverse Torsion

et al. 2019

Self Cite

View full text Add to dashboard Cite

In this work, commercial AISI 304 stainless steel rods were subjected to cyclic forward/reverse torsion (CFRT) treatments at low-speed and high-speed torsion at room temperature. Microstructures in the core and surface layers of the CFRT-treated samples were systematically characterized. Results show that the CFRT treatment can introduce martensite phase on the surface of the rods via strain-induced martensitic transformation. High-speed twisting is more effective in inducing martensite in the surface layer compared to low-speed twisting. During the stretching process, the overall strain-hardening behavior of the gradient material is related to the content of its gradient defects. Higher gradient martensite content results in a higher surface hardness of the material, but less overall tensile properties. The effect of twisting speed on torsion behavior and the strain-hardening mechanisms in tensile of the gradient structured steels was also addressed.

show abstract

Dependence of Microstructure and Hardening Behavior on Torsion Strain and Strain Rate in Extruded AZ31 Rods

Cited by 14 publications

References 32 publications

Deformation responses of AZ31B magnesium alloy under combined shear-compression loading

Deformation responses of AZ31B magnesium alloy under combined shear-compression loading

Influence of Pre-Tension on Free-End Torsion Behavior and Mechanical Properties of an Extruded Magnesium Alloy

Effect of Shear Strain Rate on Microstructure and Properties of Austenitic Steel Processed by Cyclic Forward/Reverse Torsion

Contact Info

Product

Resources

About