Improving tensile and compressive properties of magnesium alloy plates by pre-cold rolling

Song, Bo; Chen, Gang; Zhang, Xiyan; Liu, Qing

doi:10.1016/j.scriptamat.2012.02.047

Cited by 215 publications

(71 citation statements)

References 20 publications

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“…When Mg alloys are deformed in a direction favourable for {101 ̅ 2} twinning, the yield strength will be reduced in comparison to with that in more unfavourable directions [76]. In addition, because twins tend to propagate through parent grains, the boundaries between twins and parent grains act as sub-boundaries that induce Hall-Petch strengthening during deformation [77]. Strain hardening behaviour can also be attributed to the influence of mechanical twinning.…”

Section: Microstructural Evolution Of Magnesium Alloys In the Processmentioning

confidence: 99%

“…because of the morphological characteristic associated with the lenticular shape of the twins, {101 ̅ 2} twins were observed to developed to be lenticular shape in parent grains. So this type of twins can cause an analogous grain refinement phenomenon by subdividing grains to strengthen in specific directions [77,260].…”

Section: Non-schmid Twinsmentioning

confidence: 99%

“…For twinned structures, both matrix texture and twin texture have to be studied as described in the literature [77]. The twin texture plays an important role in the subsequent deformation characteristics by the volume fraction and orientation.…”

Section: Non-schmid Twinsmentioning

confidence: 99%

“…Xin et al performed a pre-strain experiment on Mg plates, the c-axis of parent grains and twins rotated to be perpendicular to the strain direction [63]. The result showed that pre-strain along the transverse direction changed the dominant deformation mechanism for the pre-twinned Mg alloy sheets along the unfavourable directions for {101 ̅ 2} twinning [77].…”

Section: Strengthening Of Twinning In Mg Alloysmentioning

confidence: 99%

“…In addition, because twins tend to propagate through parent grains, the boundaries between twins and parent grains act as sub-boundaries that induce Hall-Petch strengthening during deformation [77]. Therefore, in order to understand and effectively utilise the evolution of microstructure and texture induced by twinning in cold rolled AZ31 tubes, it is essential to obtain a comprehensive understanding of twinning modes and their impacts on processing and properties.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and microstructural characterisation in the processing of biomedical metallic fine tubes

Yao-wu¹

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Fine tube stents are used for maintaining localised flow in stenotic blood vessels. Elasticity and plasticity for expansion, rigidity for resisting bending under force and strength to prevent unexpected failure, are required properties of the tubes from which these stents are formed. Biomedical metastable β titanium alloys have been developed as implant materials for a large number of biomedical applications due to a combination of favourable characteristics, e.g. good biocompatibility, excellent toughness and corrosion resistance. A metastable β alloy, Ti-25Nb-3Mo-3Zr-2Sn, has been developed without toxic alloying elements, which is a promising candidate material for stent applications. Metallic materials used for stents are commonly not biodegradable and implanted in the vessel permanently, which may provoke in-stent restenosis and stent thrombosis. In order to remove the implanted materials after service, biodegradable materials, absorbed by the body slowly, are also a field of research interest. Magnesium alloys have been used in studies for biomedical stent applications as a new biodegradable material. Magnesium stents can reopen the blocked blood vessels temporarily before degrading in physiological environments. In addition to the biodegradable characteristics, their mechanical properties are reasonable. The Mg-3Al-1Zn (AZ31) alloy is the subject of some research on the processing of biomedical magnesium alloys as it is a commonly available commercial alloy. Consequently, the Ti-25Nb-3Mo-3Zr-2Sn alloy and the AZ31 magnesium alloy have been used in this thesis to investigate the evolution of mechanical properties and microstructure in the processing of fine tubes.The deformation mechanisms during cold deformation of metastable β titanium alloys are mainly associated with martensitic phase transformations and mechanical twinning. It has been reported that stress-induced phase transformations and {112}〈111〉, {332}〈113〉 twinning modes may be activated under different stress states in metastable β titanium alloys. They can exhibit varying elasticity, Young's modulus and strain hardening behaviour. Because the martensitic start temperature is below room temperature for most metastable β titanium alloys, the α″ martensitic transformation can easily occur under a small amount of external stress. Mechanical twins were reported to hinder slip and dislocation motion thereby increasing the strain hardening rate. The development of β and α″ texture during processing is another critical influence on the mechanical properties of fine tubes. Therefore, studies on the martensitic transformation, mechanical twins and texture evolution is of significance in order to understand the processing of β titanium fine tubes.ii Magnesium alloys deform through the formation of a large amount of mechanical twins due to the relatively low critical stress to activate twinning in comparison with 〈 + 〉 slip. There are typically two primary mechanical twinning modes for magnesium alloys, {101 ̅ 2} extension twins and {101 ̅ 1} cont...

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Section: Microstructural Evolution Of Magnesium Alloys In the Processmentioning

confidence: 99%

Section: Non-schmid Twinsmentioning

confidence: 99%

Section: Non-schmid Twinsmentioning

confidence: 99%

Section: Strengthening Of Twinning In Mg Alloysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical and microstructural characterisation in the processing of biomedical metallic fine tubes

Yao-wu¹

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Influence of Torsion Route on the Microstructure and Mechanical Properties of Extruded AZ31 Rods

et al. 2017

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Torsion deformation is an effective and simple technique to tailor the mechanical properties of Mg alloys. In this study, the influences of torsion route on microstructure and mechanical properties of AZ31 rods are investigated. The maximum torsion angle is set as 180 and the two-pass torsion at different torsion routes, twice-successive unidirectional torsion (T A ) and reciprocating torsion (T B ), is used to process the Mg alloy rods. It is found that the mechanical properties and yield asymmetry are very sensitive to the torsion route. Route T A is more effective for the enhancement of compressive yield strength and the improvement of yield asymmetry, while route T B is more effective for the enhancement of tensile yield strength. It is mainly attributed to the different textural evolutions between the two torsion routes. The relevant mechanisms are addressed and discussed. Experimental SectionExtruded AZ31 magnesium alloy rods with a diameter of 16 mm were subjected to free-end torsion deformation. Dog-bone-shaped specimens with a gauge length as Ф 6 Â 28 mm

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Tailoring the Microstructure and Mechanical Property of AZ80 Alloys by Multiple Twinning and Aging Precipitation

Wang

Xin

et al. 2017

Adv Eng Mater

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AZ80 alloy is a relatively inexpensive age-hardenable Mg alloy. To improve its precipitation strengthening effect, the discontinuous precipitates generally nucleating from grain boundaries should be reduced. In this study, the authors applied strain-path change compression on a wrought AZ80 alloy to generate multiple {10-12} twins and then the pre-deformed alloy is subjected to aging at 180 C for different period. The effects of the pre-generated twins on precipitation behavior and hence the mechanical properties are investigated. It is found that multiple {10-12} twins are formed in the AZ80 alloy after two paths of compressions along the transverse and rolling directions. Consequently, continuous precipitation is largely promoted during the subsequent aging process. Moreover, the continuous precipitates preferred to form inside the {10-12} twin lamellae. Discontinuous precipitation is almost inhibited during aging at 180 C for 4-96 h in the sample containing many multiple twins. Compare to the directly peak-aged sample, the pre-twinned and subsequently peak-aged alloys generally exhibit greatly superior mechanical properties. The yield strength, ultimate strength, and elongation for tension along RD are 242 MPa, 476 MPa, and 19.4%, respectively. These excellent properties are attributed to the combined effects of grain refinement, texture weakening, and enhanced precipitate strengthening.

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Improving tensile and compressive properties of magnesium alloy plates by pre-cold rolling

Cited by 215 publications

References 20 publications

Mechanical and microstructural characterisation in the processing of biomedical metallic fine tubes

Mechanical and microstructural characterisation in the processing of biomedical metallic fine tubes

Influence of Torsion Route on the Microstructure and Mechanical Properties of Extruded AZ31 Rods

Tailoring the Microstructure and Mechanical Property of AZ80 Alloys by Multiple Twinning and Aging Precipitation

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