Fabrication of excellent mechanical properties AZ31 magnesium alloy sheets by conventional rolling and subsequent annealing

Miao, Qing; Hu, Lianxi; Wang, Guojun; Wang, Erde

doi:10.1016/j.msea.2011.05.023

Cited by 69 publications

(17 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In practice, Kim et al [10] reported that a maximum elongation of 35%, high yield stresses over 300 MPa, and a very fine grain size of 1.4 mm were attained via asymmetrical rolling for AZ31 Mg alloy sheets. Analogous values in both elongation and strength were also observed for fineegrained LSHRed (LSHR: largeestrain hot rolling) Mg alloy sheets [7]. Referring to the researches in Refs.…”

Section: Introductionsupporting

confidence: 70%

“…The dimensions of ingots prepared for temperatureestepedown multiepass rolling are machined to size: 150 mm width Â 26e28 mm thick Â 200 mm length. Preliminary rolling experiments were carried out to maximize thickness reduction (taking plate yield and efficiency into consideration for normal production) and to optimize recrystallization temperature for thin (thickness less than 4 mm) Mg alloy sheets [7,11,20]. The optimum values obtained for a single pass are~40% in thickness reduction, and~240 C in rolling temperature.…”

Section: Methodsmentioning

confidence: 99%

“…3 shows the XRD spectra of ZK61 Mg alloy sheets compared with the standard XRD spectrum of pure magnesium powder (PDF#35e0821) [7]. The region of the XRD degree between 37 and 45 was magnified and adjusted for precipitation observation.…”

Section: Precipitationmentioning

confidence: 99%

See 2 more Smart Citations

Property improvements in fine–grained Mg–Zn–Zr alloy sheets produced by temperature–step–down multi–pass rolling

Chen

Zhang

et al. 2015

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Section: Introductionsupporting

confidence: 70%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Property improvements in fine–grained Mg–Zn–Zr alloy sheets produced by temperature–step–down multi–pass rolling

Chen

Zhang

et al. 2015

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…The influence of twinning on the mechanical behaviour of Mg alloys has been demonstrated in many studies (Barnett, Keshavarz, Beer, & Atwell, 2004;Barnett, Nave, et al, 2004;Miao, Hu, Wang, & Wang, 2011;Oppedal et al, 2012). The twin boundaries formed in grains can act as barriers to dislocation motion, as do grain boundaries, which can lead to an increase in the work-hardening rate.…”

Section: Influence Of Twinning On Mechanical Behaviourmentioning

confidence: 99%

The cold-rolling behaviour of AZ31 tubes for fabrication of biodegradable stents

Yao-wu

Kent

Wang

et al. 2014

Journal of the Mechanical Behavior of Biomedical Materials

View full text Add to dashboard Cite

The cold-rolling behaviour of AZ31 tubes for fabrication of biodegradable stents, Journal of the Mechanical Behavior of Biomedical Materials, http://dx.doi.org/10. 1016/j.jmbbm.2014.07.026 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractMg alloys are receiving considerable attention for biomedical stents due to their combination of good mechanical properties and high biodegradability. Cold rolling is necessary to process Mg alloy tubes before final drawing and fabrication of the magnesium stents. In this paper, cold-rolled tubes were subjected to a crosssectional reduction rate (ε) of up to 19.7%, and were further processed at various ratios of wall-thickness to diameter reduction (Q) from 0 to 2.24 with a constant ε of 19.7%. The results show that the cold-rolled tubes exhibited a rise in ultimate tensile strength (UTS), yield strength (YS), and a reduction in elongation as ε increased from 5.5% to 19.7%. UTS, YS and elongation decreased when Q was increased from 0 to 2.24.Mechanical twinning was observed and analysed. Extension twins increased with increasing ε and were almost saturated at an ε of 16.5%. Extension twins play an important role in determining the evolution of mechanical behaviour in the case of increasing ε, whilst contraction/double twins and secondary extension twins have a large effect on mechanical behaviour in the case of varying Q. The results indicate that the proportions and types of twins play a major role in determining the mechanical behaviour of the AZ31 tubes.

show abstract

“…The influence of twinning on the mechanical behaviour of Mg alloys has been demonstrated in many studies [53,259,296,297]. The twin boundaries formed in grains can act as barriers to dislocation motion, as do grain boundaries, which can lead to an increase in the work-hardening rate.…”

Section: Influence Of Twinning On Mechanical Behaviourmentioning

confidence: 99%

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

Yao-wu¹

View full text Add to dashboard Cite

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...

show abstract

Fabrication of excellent mechanical properties AZ31 magnesium alloy sheets by conventional rolling and subsequent annealing

Cited by 69 publications

References 25 publications

Property improvements in fine–grained Mg–Zn–Zr alloy sheets produced by temperature–step–down multi–pass rolling

Property improvements in fine–grained Mg–Zn–Zr alloy sheets produced by temperature–step–down multi–pass rolling

The cold-rolling behaviour of AZ31 tubes for fabrication of biodegradable stents

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

Contact Info

Product

Resources

About