Role of LPSO Phase in Crack Propagation Behavior of an As-Cast Mg-Y-Zn Alloy Subjected to Dynamic Loadings

Shi, Xuezhi; Long, Yunqian; Zhang, Huiqiu; Chen, Liqiao; Zhou, Yingtang; Yu, Xiaoming; Yu, Xuan; Cai, Lu; Leng, Zhe

doi:10.3390/ma12030498

Cited by 9 publications

(5 citation statements)

References 23 publications

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“…It is evident from Fig. 4b that the kinking of 18R phases was easily observed in the 4p ECAP alloy, which is consistent with reported microstructures in relevant researches that 18R exhibits good plasticity [8,42]. Figure 4c…”

Section: Microstructure Evolutionsupporting

confidence: 88%

Controlling Corrosion Resistance of a Biodegradable Mg–Y–Zn Alloy with LPSO Phases via Multi-pass ECAP Process

Wang

Jiang

Saleh

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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Mg-RE (rear earth) alloys with long period stacking (LPSO) structures have great potential in biomedical applications. The present work focused on the microstructure and corrosion behaviors of Mg 98.5 Y 1 Zn 0.5 alloys with 18R LPSO structure after equal channel angular pressing (ECAP). The results showed that the ECAP process changed the grain size and the distribution of LPSO particles thus controlled the total corrosion rates of Mg 98.5 Y 1 Zn 0.5 alloys. During the ECAP process from 0p to 12p, the grain size reduced from 160-180 μm (as-cast) to 6-8 μm (12p). The LPSO structures became kinked (4p), then started to be broken into smaller pieces (8p), and at last comminuted to fine particles and redistributed uniformly inside the matrix (12p). The improvement in the corrosion resistance for ECAP samples was obtained from 0p to 8p, with the corrosion rate reduced from 3.24 mm/year (0p) to 2.35 mm/year (8p) in simulated body fluid, and the 12p ECAP alloy exhibited the highest corrosion rate of 4.54 mm/year.

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Section: Microstructure Evolutionsupporting

confidence: 88%

Controlling Corrosion Resistance of a Biodegradable Mg–Y–Zn Alloy with LPSO Phases via Multi-pass ECAP Process

Wang

Jiang

Saleh

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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show abstract

“…However, according to the higher hardness of the blocky LPSO phases, stresses pile up and more energy will be needed. Disagreement leads either to crack blunting or passing the blocky LPSO phase sideways along the interface [59]. Any more energy needed for that increases the fracture toughness.…”

Section: Discussionmentioning

confidence: 99%

Crack Propagation in As-Extruded and Heat-Treated Mg-Dy-Nd-Zn-Zr Alloy Explained by the Effect of LPSO Structures and Their Micro- and Nanohardness

et al. 2021

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The investigation of the crack propagation in as-extruded and heat-treated Mg-Dy-Nd-Zn-Zr alloy with a focus on the interaction of long-period stacking-ordered (LPSO) structures is the aim of this study. Solution heat treatment on a hot extruded Mg-Dy-Nd-Zn-Zr (RESOLOY®) was done to change the initial fine-grained microstructure, consisting of grain boundary blocky LPSO and lamellar LPSO structures within the matrix, into coarser grains of less lamellar and blocky LPSO phases. C-ring compression tests in Ringer solution were used to cause a fracture. Crack initiation and propagation is influenced by twin boundaries and LPSO lamellae. The blocky LPSO phases also clearly hinder crack growth, by increasing the energy to pass either through the phase or along its interface. The microstructural features were characterized by micro- and nanohardness as well as the amount and location of LPSO phases in dependence on the heat treatment condition. By applying nanoindentation, blocky LPSO phases show a higher hardness than the grains with or without lamellar LPSO phases and their hardness decreases with heat treatment time. On the other hand, the matrix increases in hardness by solid solution strengthening. The microstructure consisting of a good balance of grain size, matrix and blocky LPSO phases and twins shows the highest fracture energy.

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“…This structure is created by the layering of hard metal and soft metal atomic layers 11 (Figure 1, middle), and the Mg alloy, which is conventionally regarded as a soft metal, possesses effective mechanical properties. 12 Although the LPSO structure has different components and scales, it has several commonalities with nacre and seismic isolation rubber. However, there are certain requirements that are clearly defined as the origin of the LPSO characteristics.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In the recent decades, the development of high-strength materials referred to as long-period stacking ordered (LPSO) structures , has attracted attention in the field of metallic materials such as Mg alloys. This structure is created by the layering of hard metal and soft metal atomic layers (Figure , middle), and the Mg alloy, which is conventionally regarded as a soft metal, possesses effective mechanical properties …”

Section: Introductionmentioning

confidence: 99%

Regularity Maintenance Properties under Deformation of Kink-Introduced Nano-Mille-Feuille Structures Derived from Interfacial Friction

2021

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The regularity-maintaining properties under the deformation of a kinkintroduced "Nano-mille-feuille" structure were verified, which might contribute to the development of high-strength, lightweight materials, and evidence of its usefulness was obtained. Simultaneously, a technique for evaluating the mechanical resistance of a highly ordered Nano-mille-feuille structure obtained by alternately layering individual particle films composed of polymer nanospheres and organo-modified inorganic nanoparticles with a common particle diameter of 5 nm was proposed. The Nano-millefeuille was prepared on a flexible resin substrate that was subjected to uniaxial drawing deformation using a manual drawing machine to monitor changes in the layered regularity of multiparticle layers on its surface. Furthermore, the same estimation as the kink-introduced Nano-mille-feuille, which was created on an underlayer introducing advance nanometer-sized steps on one-half of the substrate, was made and compared to the regularity-maintaining properties of the Nano-mille-feuille. The presence of kink-like nanosteps demonstrated the effect of enhancing the deformation resistance of the layered regularity of the multiparticle layers. It was confirmed that the presence of kinks maintains the layering regularity of nanoparticles even under drawing deformation at a higher magnification. The presence of nanokinks is expected to enhance the interfacial friction of the particle layers and has shown the possibility of structural/functional correlation that can impart high-strength properties to materials derived from light elements and/or lightweight metals in future.

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Role of LPSO Phase in Crack Propagation Behavior of an As-Cast Mg-Y-Zn Alloy Subjected to Dynamic Loadings

Cited by 9 publications

References 23 publications

Controlling Corrosion Resistance of a Biodegradable Mg–Y–Zn Alloy with LPSO Phases via Multi-pass ECAP Process

Controlling Corrosion Resistance of a Biodegradable Mg–Y–Zn Alloy with LPSO Phases via Multi-pass ECAP Process

Crack Propagation in As-Extruded and Heat-Treated Mg-Dy-Nd-Zn-Zr Alloy Explained by the Effect of LPSO Structures and Their Micro- and Nanohardness

Regularity Maintenance Properties under Deformation of Kink-Introduced Nano-Mille-Feuille Structures Derived from Interfacial Friction

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