Abstract: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-… Show more
“… Figure 11 The yield stress contribution of the sintered samples, including four parts: refining grains, SSSS, β 1 phase and LPSO phase. The calculation process was based on Hall–Petch relation, solid-solution strengthening relation, and Orowan relation 25 , 35 , the detailed information was shown in Table S3. The black square dots was the actual tested yield stress.…”
Section: Resultsmentioning
confidence: 99%
“…The heating temperature was kept at 710 °C , the copper-roller speed was about 80–90 r·s −1 , in a N 2 atmosphere (∼5 kPa). The related ribbon-preparation parameters were described in our previous study 25 . The obtained ribbons were conserved in liquid nitrogen.…”
Section: Methodsmentioning
confidence: 99%
“…To take advantage of the strengthening effect of the β 1 phase, we developed a method based on the low temperature sintering (spark plasma sintering, SPS) rapid solidification (RS) strip process 24 , to achieve regulating the precipitation behavior of supersaturated solid solution (SSSS) and controlling the β 1 phase size. Using this method, a multiple microstructure with fine Mg grains, LPSO phase, β 1 phase, and β′ phase was successfully prepared 25 . SPS conducts a pressure and pulsed current assisted sintering process and belongs to a more general class of electric current activated sintering (ECAS) techniques 26 – 28 , the fine grains and appropriate second-phases’ sizes and contents could be controlled with different sintering parameters.…”
Mg–15Gd–1Zn (wt.%) alloy was successfully prepared via the spark plasma sintering rapid solidification ribbons process. Microstructure investigation showed that the sintered alloys consisted of fine grains, the β1 phase, and long-perioded stacking ordered phase (LPSO). The sintering temperature and time have a significant effect on the microstructural evolution. A lower sintering temperature (430 °C ) was beneficial for obtaining finer grain sizes with less than 5 μm and a higher content of β1 phase with a content of 3–15 vol.% and a size-distribution of (10–600) nm. A higher temperature for a longer sintering time, 450–470 °C and 5–10 min, helpfully promoted precipitating the abundantly lamellar LPSO phase, and its content was 2–10 vol.% for LPSO phase with the width of (10–100) nm. The mechanical properties indicated that the fine grain size and supersaturated solid solution contributed at least 50% of the yield stress, and the residual contribution was related to the β1 phase and LPSO phase strengthening, which were based on their contents and the sizes.
“… Figure 11 The yield stress contribution of the sintered samples, including four parts: refining grains, SSSS, β 1 phase and LPSO phase. The calculation process was based on Hall–Petch relation, solid-solution strengthening relation, and Orowan relation 25 , 35 , the detailed information was shown in Table S3. The black square dots was the actual tested yield stress.…”
Section: Resultsmentioning
confidence: 99%
“…The heating temperature was kept at 710 °C , the copper-roller speed was about 80–90 r·s −1 , in a N 2 atmosphere (∼5 kPa). The related ribbon-preparation parameters were described in our previous study 25 . The obtained ribbons were conserved in liquid nitrogen.…”
Section: Methodsmentioning
confidence: 99%
“…To take advantage of the strengthening effect of the β 1 phase, we developed a method based on the low temperature sintering (spark plasma sintering, SPS) rapid solidification (RS) strip process 24 , to achieve regulating the precipitation behavior of supersaturated solid solution (SSSS) and controlling the β 1 phase size. Using this method, a multiple microstructure with fine Mg grains, LPSO phase, β 1 phase, and β′ phase was successfully prepared 25 . SPS conducts a pressure and pulsed current assisted sintering process and belongs to a more general class of electric current activated sintering (ECAS) techniques 26 – 28 , the fine grains and appropriate second-phases’ sizes and contents could be controlled with different sintering parameters.…”
Mg–15Gd–1Zn (wt.%) alloy was successfully prepared via the spark plasma sintering rapid solidification ribbons process. Microstructure investigation showed that the sintered alloys consisted of fine grains, the β1 phase, and long-perioded stacking ordered phase (LPSO). The sintering temperature and time have a significant effect on the microstructural evolution. A lower sintering temperature (430 °C ) was beneficial for obtaining finer grain sizes with less than 5 μm and a higher content of β1 phase with a content of 3–15 vol.% and a size-distribution of (10–600) nm. A higher temperature for a longer sintering time, 450–470 °C and 5–10 min, helpfully promoted precipitating the abundantly lamellar LPSO phase, and its content was 2–10 vol.% for LPSO phase with the width of (10–100) nm. The mechanical properties indicated that the fine grain size and supersaturated solid solution contributed at least 50% of the yield stress, and the residual contribution was related to the β1 phase and LPSO phase strengthening, which were based on their contents and the sizes.
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