Microstructure evolution and mechanical properties of a large-sized ingot of Mg−9Gd−3Y−1.5Zn−0.5Zr (wt%) alloy after a lower-temperature homogenization treatment

Zhang, Xue; Ren, Yuejuan; Luo, Wenbo; Ren, Yu; Xu, Ping; Xu, Chao

doi:10.1007/s12613-017-1405-6

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…The following reasons are given. Firstly, the LPSO phase can be steadily formed in a wide temperature range of 200-520 • C [18,24], which is favorable for the sintering of most Mg-RE-Zn alloys because the sintering is usually conducted in the temperature range of 400-500 • C. Secondly, the precursor of sintering bulk, RS ribbons, consists of supersaturated solid solution (SSS) and a small amount of the β 1 phase particles. SSS provides more possibilities for the nucleation of the LPSO phase.…”

Section: The Lpso Phase Formationmentioning

confidence: 99%

Microstructure Evolution of Mg96.9Gd2.7Zn0.4 Alloy Containing Multiple Phases Prepared by Spark Plasma Sintering Method

Zhang

Han

Luo

et al. 2020

Metals

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The synergic strengthening of multiple phases is an essential way to achieve high-performance Mg alloys. Herein, Mg-Gd-Zn alloy containing four phases was prepared by rapid solidification (RS) ribbons and spark plasma sintering (SPS). The microstructure of the alloy consisted of α-Mg, nanosized β1 phase particles, lamellar long period stacking ordered (LPSO) phase, and β′ phase precipitates. The microstructural evolution was also investigated. The results show that the metastable β1 phase was formed in the as-cast solidification through rapid solidification, because both Zn atoms and the short holding-time at molten liquid facilitated the formation of the β1 phase. The β1 phase grew from 35.6 to 154 nm during the sintering process. Meanwhile, the fine lamellar LPSO phase was simultaneously formed after the Zn-Gd clusters were generated from the supersaturated solid solution, and the width of the LPSO phase was only in the range of 2–30 nm. The third strengthening phase, the metastable β′ phase, was obtained by aging treatment. The results of hardness testing implied that the hardness of the alloy containing the aforementioned three nanosized strengthening phases significantly improved about 47% to 126 HV compared with that of the as-cast ingot.

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Section: The Lpso Phase Formationmentioning

confidence: 99%

Microstructure Evolution of Mg96.9Gd2.7Zn0.4 Alloy Containing Multiple Phases Prepared by Spark Plasma Sintering Method

Zhang

Han

Luo

et al. 2020

Metals

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“…Therefore, the thermal deformation behavior of magnesium alloys varies significantly with the microstructure. Based on the previous studies, the higher rare earth and Zn content (RE/ Zn) ratio is necessary to form a lamellar LPSO phase [14]. In order to better study the effect of different rare earth content on the relative thermal workability of LPSO, we prepared Mg-7.5Gd-2.5Y-1.5Zn-0.5Zr (wt%) alloy.…”

Section: Introductionmentioning

confidence: 99%

Thermal compression, processing maps and microstructural evolution of as-cast Mg-Gd-Y-Zn-Zr alloy with long period stacking ordered phase

Zhang¹,

Luo²,

Zhao³

et al. 2020

Mater. Res. Express

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Thermal deformation of Mg-7.5Gd-2.5Y-1.5Zn-0.5Zr (wt%) as-cast alloy containing LPSO phase was been studied in a temperature range from 623 K to 723 K and a strain rate range from 0.001 to 1 s −1 . The microstructural evolution at the various strain rates was also analyzed. The results show that the flow stress decreases significantly with the increase of the deformation temperature. But the peak flow stresses of the alloy increase significantly at high deformation temperature, due to existing both the plentiful lamellar LPSO phase and the fine dynamic DRXed grains. Under the high strain rate conditions, the LPSO phase distorted and formed kink bands. The deformational activation energy (Q) of the alloy is about 234.6 kJ·mol −1 . This high Q value mainly owe to profuse lamellar LPSO phase hindering the movement of atoms. With the observation of established processing map of the alloy, some good thermal workabilities are observed in following zones: 723 K, 0.001<ε<1 s −1 ; and the zone with middle temperature and moderate strain rate condition, 673 K, 0.01<ε<0.1 s −1 . The thermal deformation instability zones are mainly located in the region with high strain rate and lower temperature.

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Effect of continuous annealing temperature on microstructure and properties of ferritic rolled interstitial-free steel

Qiu

Hao

et al. 2018

Int J Miner Metall Mater

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Microstructure evolution and mechanical properties of a large-sized ingot of Mg−9Gd−3Y−1.5Zn−0.5Zr (wt%) alloy after a lower-temperature homogenization treatment

Cited by 6 publications

References 22 publications

Microstructure Evolution of Mg96.9Gd2.7Zn0.4 Alloy Containing Multiple Phases Prepared by Spark Plasma Sintering Method

Microstructure Evolution of Mg96.9Gd2.7Zn0.4 Alloy Containing Multiple Phases Prepared by Spark Plasma Sintering Method

Thermal compression, processing maps and microstructural evolution of as-cast Mg-Gd-Y-Zn-Zr alloy with long period stacking ordered phase

Effect of continuous annealing temperature on microstructure and properties of ferritic rolled interstitial-free steel

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