Understanding of variant selection and twin patterns in compressed Mg alloy sheets via combined analysis of Schmid factor and strain compatibility factor

Guo, Changfa; Xin, Renlong; Ding, Changhong; Song, Bo; Qing, Liu

doi:10.1016/j.msea.2014.04.103

Cited by 140 publications

(50 citation statements)

References 30 publications

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“…This is consistent with some recent reports that ET can form in soft orientations [15,16]. Recently, synergetic twin nucleation or twin transfer processes have been frequently observed in compression of Mg alloys [18,22,[27][28][29], forming twin pairs across GBs. The formation of twin pairs has been ascribed partly to the high local strain compatibility between the paired twins [22,28,29].…”

Section: Resultssupporting

confidence: 92%

The mechanism of twinning activation and variant selection in magnesium alloys dominated by slip deformation

Liu

Xin

Shu

et al. 2016

Journal of Alloys and Compounds

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Section: Resultssupporting

confidence: 92%

The mechanism of twinning activation and variant selection in magnesium alloys dominated by slip deformation

Liu

Xin

Shu

et al. 2016

Journal of Alloys and Compounds

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“…It seems that the extension twinning is rather governed by the average value of the TwSF. This observation supports the conclusions of the works of Beyerlein et al [5] and Guo et al [7]. Based on the analysis of EBSD maps they found that in a compressed specimen the nucleation of a given twin variant strongly depends also on other parameters (grain boundary, orientation of the neighboring grains etc.).…”

Section: Resultssupporting

confidence: 89%

Twinning Evolution as a Function of Loading Direction in Magnesium

et al. 2015

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The twinning activity in random textured cast magnesium during monotonic, room temperature tension and compression tests was monitored by neutron diraction. Decrease of integrated intensity which characterizes the twinned volume fraction of selected reections was compared to its Schmid factor. The comparison shows that twinned fraction correlates with the maximum value of the Schmid factor with high precision during tensile test and with the average value of the Schmid factor during compression test.

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“…Contraction and double twins were only observed in relatively large grains due to the elastic strain energy. The mechanism of double twinning involves formation of {101 ̅ 2} extension twins initially as the primary twins, then secondary {101 ̅ 1} contraction twins nucleate and propagate within the primary twins [62,347]. There is a relative large grain G2 in Fig.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…This shows that the SF is not the only aspect determining the activation of a given twin. Recent studies indicate that the variant selection in twin chains and multiple twins is also associated with the efficiency of twin transfer across twins and GBs [248,347]. It is well known that the formation of twins involves shearing in parent grains.…”

Section: Modified Schmid Factormentioning

confidence: 99%

“…The efficiency of twin transfer across GBs can be described by a strain compatibility factor, 0 = cos × cos , where ψ is the angle between the twinning plane normal of the two neighbouring grains, and κ is the angle between twinning shear direction of the two neighbouring grains [347]. The m0 between neighbouring twins can be calculated using the orientation data from EBSD results.…”

Section: Multiple Twinsmentioning

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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Understanding of variant selection and twin patterns in compressed Mg alloy sheets via combined analysis of Schmid factor and strain compatibility factor

Cited by 140 publications

References 30 publications

The mechanism of twinning activation and variant selection in magnesium alloys dominated by slip deformation

The mechanism of twinning activation and variant selection in magnesium alloys dominated by slip deformation

Twinning Evolution as a Function of Loading Direction in Magnesium

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

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