The influence of minor boron on the precipitation behavior of LPSO phase and dynamic recrystallization in the Mg94Y2.5Zn2.5Mn1 alloys

Yang, Kai; Zhang, Jinshan; Zong, Ximei; Liu, Wei; Hao, Jianqiang; Xu, Chunxiang

doi:10.1016/j.msea.2017.08.074

Cited by 17 publications

(10 citation statements)

References 40 publications

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“…1) The LPSO phase and W phase nanoparticles could restrict the DRXed grain growth during hot extrusion process. Under the same deformation conditions, the restraint effect of 14H‐LPSO is greater than that of 18R‐LPSO . Moreover, the dispersed W phase nanoparticles could pin grain boundaries' motion and inhibit grain growth.…”

Section: Resultsmentioning

confidence: 97%

“…Previous studies showed that the stacking fault (SFs) is an essential condition for the formation of the 18R‐LPSO phase . The SF energy value of α‐Mg was inversely proportional to the atomic radius difference between Mg atoms and alloying atoms.…”

Section: Resultsmentioning

confidence: 99%

“…It was well known that the precipitation of the LPSO phase needs to satisfy three factors: 1) sufficient SFs; 2) abundant solute atoms; and 3) that the solute atoms have to be close to SFs . Therefore, SFs and sufficient solute atoms were necessary for the precipitation of LPSO phase.…”

Section: Resultsmentioning

confidence: 99%

“…In general, by adjusting the Zn/Y atomic ratio, three kinds of ternary equilibrium phases can be obtained in the Mg–Zn–Y alloys, namely, LPSO phase, I phase, and W phase . Among them, LPSO phase is an excellent strengthening phase which is tightly combined with the α‐Mg matrix and could effectively improve the mechanical and corrosion properties . There are various methods for improving the performance of Mg–Zn–Y alloys containing LPSO, such as the production of new alloys by introducing alloying elements (Zr, Sr, B, Ti, and Mn) or ceramic particles (B 4 C and TiB 2 ), various novel casting methods by ultrasonic and electromagnetic stirring treatment, and grain refinement by severe plastic deformation (hot extrusion, rolling, and equal channel angular pressing) .…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Performance of Mg–Zn–Y–Mn Alloy via Minor Ca Addition

et al. 2019

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Herein, the effect of calcium (Ca) microalloying on the microstructure and mechanical properties of Mg94Zn2.5Y2.5Mn1 alloy is identified. The long‐period stacking‐ordered (LPSO) phase transformation mechanism during solid‐solution treatment and hot deformation behavior during extrusion process are analyzed. The role of minor (0.34 at%) Ca addition in the as‐cast alloy is related to the fine microstructure and abundant 18R‐LPSO phase. Furthermore, the precipitation of 14H‐LPSO phase is greatly induced by Ca addition in subsequent solid‐solution treatment. As for as‐extruded alloys, the dynamic precipitation behavior of W phase nanoparticles is found. The high‐density W phase nanoparticles suppress the dynamic recrystallization (DRX) behavior and inhibit the growth of dynamical recrystallized (DRXed) grains. The as‐extruded Ca‐modified alloy shows a superior mechanical property with yield strength (YS), ultimate tensile strength (UTS), and elongation of 400, 434 MPa, and 19.5%, respectively. The tiny microstructure, W phase nanoparticles, and kinky LPSO (both 18R and 14H type) phase are the reasons for the outstanding mechanical properties.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Performance of Mg–Zn–Y–Mn Alloy via Minor Ca Addition

et al. 2019

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“…The bigger the atomic radius difference between the Mg and solute‐alloying elements, the lower the stacking fault energy of Mg alloys. As an alloying element, manganese (Mn) has a big difference in atomic radius compared with Mg (the atomic radius of Mg is 0.160 nm and that of Mn is 0.130 nm), which might be a potential element for reducing stacking fault energy . Furthermore, Mn is an essential element for the growth of bones …”

Section: Introductionmentioning

confidence: 99%

Mn‐promoting formation of a long‐period stacking‐ordered phase in laser‐melted Mg alloys to enhance degradation resistance

Shuai

Liu

Gao

et al. 2019

Materials & Corrosion

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Magnesium (Mg) alloys are promising candidates for use as biomedical implant materials. However, their very fast degradation rate greatly restricts their application. A rare earth phase possessed with a long‐period stacking‐ordered (LPSO) structure was in favor of enhancing the degradation resistance of Mg alloys. In fact, the formation of the LPSO phase in Mg alloys depends on their stacking fault energy. The lower the stacking fault energy, the more the LPSO phase formed. In this study, manganese (Mn) was alloyed to Mg alloy ZK30–10Gd (containing 3 wt.% Zn and 10 wt.% Gd) via selective laser melting to promote the formation of the LPSO phase. As an alloying element, Mn could be in favor of reducing stacking fault energy due to the fact that the large difference between the atomic radius of Mn and that of Mg induced large lattice distortion to facilitate forming stacking faults. The results showed that as the Mn content increased from 0 to 1.2 wt.%, the area fraction of LPSO phase increased from 12.22% to 22.37%, meanwhile the area fraction of (Mg,Zn)3Gd phase decreased from 9.31% to 2.32%. The ZK30–10Gd–0.6Mn possessed the highest degradation resistance (weight loss rate 0.38 mg · cm−2 · day−1). The enhancement of degradation resistance had two reasons. On the one hand, more LPSO phase provided more sites for nucleation of degradation products, which could promote the formation of a homogeneous and compact degradation product film to protect the Mg matrix. On the other hand, the inhibition of (Mg,Zn)3Gd phase precipitation could reduce galvanic corrosion.

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