Analysis of kink boundaries in deformed synchronized long-period stacking ordered magnesium alloys

Gao, Haijun; Ikeda, Ken; Morikawa, Tatsuya; Higashida, Kenji; Nakashima, Hideharu

doi:10.1016/j.matlet.2015.01.136

Cited by 42 publications

(9 citation statements)

References 16 publications

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“…We also assume that the LPSO phase cannot undergo twinning and its high volume fraction (>30%) suppresses twinning activity in the remained unrecrystallized grains. [9,10] Since twinning is playing the minor role in the accommodation of the plastic strain, deformation is controlled by slip systems and kinking. Deformation kinks are formed by basal dislocations, which produce generally low AE.…”

Section: Discussionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8] For Mg alloys with the long-period stacking-ordered (LPSO) phase, the long stacking periodicity of Zn and Y can significantly suppress the formation of the extension twins in the Mg matrix. [9,10] Moreover, there is a general agreement that besides dislocation slip and twinning, the formation of "deformation kinks" in the LPSO phase controls the plastic deformation in these materials. Deformation kinks are formed when a large compressive stress is applied parallel to basal planes, which leads to an avalanche-like motion of (0001) basal dislocations.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Microstructure and Mechanical Properties of Mg–Y–Zn Alloys with Respect to Different Content of LPSO Phase

et al. 2017

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The Mg-Y-Zn alloys with different contents of alloying elements are extruded at an extrusion ratio of 4:1 at 350 C. The microstructure of the alloys is of an inhomogeneous character showing fine grains produced due to dynamic recrystallization and coarse original grains elongated along the extrusion direction (ED). Moreover, Y and Zn form a long-period stacking-ordered (LPSO) phase whose volume fraction increases with their increasing content in the alloy. All investigated alloys exhibit distinct fiber textures with basal planes oriented parallel to ED. It is seen that increasing content of alloying elements leads to a weaker texture. Compression tests with concurrent acoustic emission (AE) measurements are performed along ED at room temperature and a constant strain rate in order to reveal active deformation mechanisms in the alloys and to relate them to their mechanical properties. The AE response is also discussed with respect to the volume fraction of the LPSO phase.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization of Microstructure and Mechanical Properties of Mg–Y–Zn Alloys with Respect to Different Content of LPSO Phase

et al. 2017

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“…Moreover, Mg97Zn1Y2 alloy also displays other excellent characteristics, which makes it greatly different from those conventional magnesium alloys containing ordinary intermetallic compound phases. X-Mg 12 ZnY phase with LPSO structure enhances strength by preventing the growth of {10–12} deformation twin in Mg matrix [5], meanwhile it contributes significantly to ductility by deforming through the kink band mechanism when subjected to compressive stress parallel to the (0001) plane [6]. Furthermore, the LPSO phase exhibited a rather high thermal stability up to 500 °C in an extruded Mg97Zn1Y2 alloy, which was proved by the unchanged morphology of the LPSO phase even after an annealing treatment at the elevated temperature of 500 °C [7].…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior and the Mild–Severe Wear Transition of Mg97Zn1Y2 Alloy with a LPSO Structure Phase

Sun

Xuan

et al. 2018

Materials

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Dry friction and wear tests were performed on as-cast Mg97Zn1Y2 alloy using a pin-on-disc configuration. Coefficients of friction and wear rates were measured as a function of applied load at sliding speeds of 0.2, 0.8 and 3.0 m/s. The wear mechanisms were identified in the mild and severe wear regimes by means of morphological observation and composition analysis of worn surfaces using scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS). Analyses of microstructure and hardness changes in subsurfaces verified the microstructure transformation from the deformed to the dynamically recrystallized, and properties changed from the strain hardening to dynamic crystallization (DRX) softening before and after the mild–severe wear transition. The mild–severe wear transition can be determined by a proposed contact surface DRX temperature criterion, from which the critical DRX temperatures at different sliding speeds are calculated using DRX dynamics; hence transition loads can also be calculated using a transition load model. The calculated transition loads are in good agreement with the measured ones, demonstrating the validity and applicability of the contact surface DRX temperature criterion.

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“…There was a marked increase in the TYS, with the increase in the content of the LPSO phase. The LPSO phases exhibit a unique mode of plastic deformation, known as kink deformation [24]. The deformation models of the LPSO phases and α-Mg are significantly different.…”

Section: Discussionmentioning

confidence: 99%

Effects of Substitution of Y with Yb and Ce on the Microstructures and Mechanical Properties of Mg88.5Zn5Y6.5

Liao

Lee

Song

et al. 2020

Metals

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The microstructures and mechanical properties of the Mg88.5Zn5Y6.5-XREX (RE = Yb and Ce, X = 0, 1.5, 3.0, and 4.5) (wt.%) alloys were investigated in the present study. Mg88.5Zn5Y6.5 is composed of three phases, namely, α-Mg, long-period stacking ordered (LPSO) phases, and intermetallic compounds. The content of the LPSO phases decreased with the addition of Ce and Yb, and no LPSO phases were detected in Mg88.5Zn5Y2.0Yb4.5. The alloys containing the LPSO phases possessed a stratified microstructure and exhibited excellent mechanical properties. Mg88.5Zn5Y5.0Ce1.5 exhibited the highest creep resistance and mechanical strength at both room temperature and 200 °C, owing to its suitable microstructure and high thermal stability. The yield strength of Mg88.5Zn5Y5.0Ce1.5 at room temperature was 358 MPa. The ultimate tensile strength of Mg88.5Zn5Y5.0Ce1.5 at room temperature and 200 °C was 453 MPa and 360 MPa, respectively.

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Analysis of kink boundaries in deformed synchronized long-period stacking ordered magnesium alloys

Cited by 42 publications

References 16 publications

Characterization of Microstructure and Mechanical Properties of Mg–Y–Zn Alloys with Respect to Different Content of LPSO Phase

Characterization of Microstructure and Mechanical Properties of Mg–Y–Zn Alloys with Respect to Different Content of LPSO Phase

Tribological Behavior and the Mild–Severe Wear Transition of Mg97Zn1Y2 Alloy with a LPSO Structure Phase

Effects of Substitution of Y with Yb and Ce on the Microstructures and Mechanical Properties of Mg88.5Zn5Y6.5

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