Twinning effects in a rod-textured AM30 Magnesium alloy

Ma, Qin; Kadiri, Haitham El; Oppedal, A.L.; Baird, James C.; Li, B.; Horstemeyer, M.F.; Vogel, Sven C.

doi:10.1016/j.ijplas.2011.08.001

Cited by 172 publications

(57 citation statements)

References 47 publications

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“…[3][4][5][6][7] Jiang et al [8] and Yang and Zhang [9] reported that different twin variants and twin-twin intersections are associated with the deformation stage with a higher strain hardening rate in AZ31 Mg alloy which is subjected to compression along the extrusion direction. Ma et al [10] and Oppedal et al [11] found that multivariants are activated to accommodate large straining and the subsequent twin-twin interaction contributes to a significant strain hardening. El Kadiri et al [12] compared twin growth behavior in two grains that contain different numbers of * Corresponding authors.…”

mentioning

confidence: 99%

Co-zone {1¯012} Twin Interaction in Magnesium Single Crystal

Wang

Jiang

et al. 2013

Materials Research Letters

103

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mentioning

confidence: 99%

Co-zone {1¯012} Twin Interaction in Magnesium Single Crystal

Wang

Jiang

et al. 2013

Materials Research Letters

103

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“…Texture development and reorientations of grains are inevitable during deformation of the AZ31 tubes and both extension and contraction twinning may be activated simultaneously (Liang, Sun, Liu, & Wang, 2009;Ranjbar Bahadori, Dehghani, & Bakhshandeh, 2013). The c-axis of the grains tends to rotate into alignment with the deformation direction (Kim et al, 2005;Ma et al, 2012). In the case of increasing ε, there was compressive stress on the RD and TD components (Fig.…”

Section: Twinning Development During Cold-rollingmentioning

confidence: 99%

“…{10 1}-{10 2} double twinning is frequently formed within {10 1} contraction twins, and has a similar effect on softening to contraction twins (Cizek & Barnett, 2008;Ma et al, 2012). However, this type of structure is considered to lead to rapid flow localisation and failure (Cizek & Barnett, 2008) due to the combined effects of strain softening and localised void formation (Barnett, 2007).…”

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

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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.

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“…Texture development and reorientations of grains are inevitable during deformation of the AZ31 tubes and both extension and contraction twinning may be activated simultaneously [290,291]. The c-axis of the grains tends to rotate into alignment with the deformation direction [292,293]. In the case of increasing ε, there was compressive stress on the RD and TD components (Fig.…”

Section: Twinning Development During Cold-rollingmentioning

confidence: 99%

“…{101 ̅ 1}-{101 ̅ 2} double twinning is frequently formed within {101 ̅ 1} contraction twins, and has a similar effect on softening to contraction twins [240,293]. However, this type of structure is considered to lead to rapid flow localisation and failure [240] due to the combined effects of strain softening and localised void formation [75].…”

Section: Influence Of Twinning On Mechanical Behaviourmentioning

confidence: 99%

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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Twinning effects in a rod-textured AM30 Magnesium alloy

Cited by 172 publications

References 47 publications

Co-zone {1¯012} Twin Interaction in Magnesium Single Crystal

Co-zone {1¯012} Twin Interaction in Magnesium Single Crystal

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

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

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