Computer-aided cooling curve thermal analysis and microstructural characterization of Mg–Gd–Y–Zr system alloys

Li, Jilin; Chen, Rongshi; Ma, Yuequn; Ke, Wei

doi:10.1016/j.tca.2014.07.004

Cited by 31 publications

(9 citation statements)

References 30 publications

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“…In order to further certify the precipitation sequence of the two types of Al 2 Y phases as shown above, the thermal analysis tests were conducted for the as-cast YA605 and YA65 alloys, respectively. There are detailed descriptions and experimental verification of the test previously reported in the literature [ 26 , 27 ]. Figure 4 shows the cooling rate and cooling curves of alloy solidification process and the corresponding microstructure of the alloy at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Magnesium Alloy Containing Al2Y Particles

et al. 2018

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A magnesium alloy containing Al2Y particles was successfully fabricated by changing the content of Al in the Mg-6Y alloy melt. Its microstructure and mechanical properties were subsequently characterized. The results show that two types of Al2Y particles were discovered in the Mg-6Y-xAl (x = 0.5–5) alloys, which are namely the polygonal particles in the pre-precipitated phase and the discontinuous network of particles in the eutectic phase. With an increase in Al content, the amount of pre-precipitated Al2Y increases and the eutectic decreases gradually. When the Al content is 5 wt %, Al2Y particles are almost all in the pre-precipitated phase in the Mg-6Y alloy. After hot extrusion, the YA65 alloy could be regarded as the Mg master alloy that contains Al2Y particles with heterogeneous nucleation capability or Al2Y particle-reinforced magnesium matrix composites. The tensile strength of the as-extruded magnesium alloy is significantly improved at ambient temperatures.

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Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Magnesium Alloy Containing Al2Y Particles

et al. 2018

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“…Then the electrical resistance furnace was turned off and partly open. The melt was cooled in air with a cooling rate of ≈0.34 °C s −1 , and the temperature changes were continuously recorded by a high‐speed data acquisition system linked to the computer . The recorded data were imported into Origin 8.6 data analysis software to plot the cooling curves ( T–t ) and corresponding first derivative curves (d T/ d t − t ).…”

Section: Methodsmentioning

confidence: 99%

“…The recorded data were imported into Origin 8.6 data analysis software to plot the cooling curves ( T–t ) and corresponding first derivative curves (d T/ d t − t ). In addition, a base line was plotted by curve fitting of part of the first derivative curves, where temperature is below T sol and above T liq , to calculate the fraction solid …”

Section: Methodsmentioning

confidence: 99%

“…Shrinkage microporosity is believed to be associated with solidification range, i.e., alloys with wide solidification range are prone to form shrinkage microporosity . Mg alloys with rare earth elements addition were reported to have a relatively narrow solidification range (≈100 °C for Mg–Gd–Y Mg alloys) when compared with other Mg alloys (≈171 °C for AZ91) . This study attempted to find appropriate Niyama evaluation condition for Mg–6Gd–3Y–0.5Zr (GW63) Mg alloys, during solidification process in gravity casting (GC) and low‐pressure sand casting, by comparing the experimental results and calculated Ny, coupled with thermal analysis.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Shrinkage Microporosity in Gravity‐Cast and Low‐Pressure Sand‐Cast Mg–6Gd–3Y–0.5Zr Magnesium Alloys

Zhou

Chen

et al. 2019

Adv Eng Mater

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The Niyama criterion and the dimensionless Niyama criterion are used to predict shrinkage microporosity in Mg–6Gd–3Y–0.5Zr magnesium plates processed by gravity casting and low‐pressure sand casting. Instead of the Niyama evaluation condition recommended by commercial ProCAST software and precious studies, the most appropriate Niyama evaluation condition is suggested as fraction solid of 0.7 for the investigated alloys. With consideration of the actual distribution of shrinkage microporosity and the definition of unsound samples (shrinkage microporosity volume fraction is higher than 1% based on the tensile test), the corresponding threshold Niyama values are qualitatively determined as 0.44 and 0.3 °C0.5 s0.5 mm−1 for gravity‐cast and low‐pressure sand‐cast plates, respectively. It indicates that exerting pressure contributes to the decrease in the threshold Niyama value. In addition, exerting pressure can reduce the amount of shrinkage microporosity. For the dimensionless Niyama criterion, it is capable to quantitatively predict the shrinkage microporosity volume fraction in low microporosity‐containing regions, but not in high microporosity‐containing regions.

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“…The solidification characteristics of metals and alloys can be examined through various thermal analysis techniques. Computer-aided cooling curve analysis is more suitable to industrial applications than other methods, and because it is easy to use and has low cost, it has been successfully applied to several investigations on the solidification sequences of magnesium alloys in recent years [10,11]. In the present research, the solidification behavior, microstructure, and mechanical properties of as-cast ZRE1 alloy with praseodymium and erbium additions are investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of praseodymium and erbium additions on solidification characteristics, microstructure and mechanical properties of as–cast ZRE1 magnesium alloy

Ahmad

Sheggaf

Asmael

2017

Materialwissenschaft Werkst

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In this research, computer‐aided cooling curve thermal analysis, microstructure analysis, hardness measurements, and tensile test were performed to investigate the effect of praseodymium (Pr) and erbium (Er) additions on as‐cast ZRE1 magnesium (Mg) alloys. Results from the cooling curve and microstructure analysis showed that praseodymium and erbium altered the grain size of the alloys. Thermal analysis result demonstrated an increased solidification rate with praseodymium and erbium additions. Furthermore, the grain size was reduced by approximately 16 % and 15 % with the addition of praseodymium and erbium, respectively. Scanning electron microscopy/energy dispersive X‐ray spectroscopy results showed that praseodymium combined with the original second phase and formed Mg−Zn‐Pr−Ce, and erbium dissolved into the α‐Mg matrix. Both additives improved the hardness and ultimate tensile strength of the ZRE1 magnesium alloy.

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Computer-aided cooling curve thermal analysis and microstructural characterization of Mg–Gd–Y–Zr system alloys

Cited by 31 publications

References 30 publications

Preparation and Characterization of Magnesium Alloy Containing Al2Y Particles

Preparation and Characterization of Magnesium Alloy Containing Al2Y Particles

Prediction of Shrinkage Microporosity in Gravity‐Cast and Low‐Pressure Sand‐Cast Mg–6Gd–3Y–0.5Zr Magnesium Alloys

Effect of praseodymium and erbium additions on solidification characteristics, microstructure and mechanical properties of as–cast ZRE1 magnesium alloy

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