Improved Zr grain refining efficiency for commercial purity Mg via intensive melt shearing

Peng, Guosheng; Wang, Y.; Chen, K. H.; Chen, S. Y.

doi:10.1080/13640461.2017.1317393

Cited by 7 publications

(8 citation statements)

References 10 publications

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“…To achieve this aim, a new Mg-Zr master alloy with fine Zr particles [14,80] has been developed, and pre-treatments [27,[81][82][83][84][85][86][87] have been conducted to modify the Mg-Zr master alloys already available. In addition, melt treatment can be conducted to reduce the settling of Zr during the melting of the Mg alloy, thereby improving the Zr grain refinement efficiency [41,49,[88][89][90][91][92][93][94]. This section briefly summarizes these methods.…”

Section: Methods Of Improving the Grain Refinement Efficiency Of Zrmentioning

confidence: 99%

“…Table 2 presents a comparison between the crystal structures of Mg and Zr, indicating that both α-Zr and α-Mg have HCP crystal structures, and their lattice parameters are quite similar. Thus, Zr has outstanding potency for acting as a nucleation substrate for Mg phase [41]. The perfect nucleation ability of Zr can be further verified by low undercooling (∆T n ≈ 0.15 • C [42]) equal to that for Al grains nucleating on TiB 2 substrates (~0.2 • C [43]).…”

Section: Peritectic Reactionmentioning

confidence: 99%

“…Melt treatments such as ultrasonic treatment (UST) [88][89][90][91], intensive melt shear (IMS) [41,49,92,93] or low-frequency electro-magnetic stirring (LFEMS) [94] have be tried after the addition of Zr into the Mg alloy melt. Ramirez et al [88] showed that U enhances the effect of grain refinement with Zr (0.5, 1.0 or 1.5Zr) on Mg-3Zn alloy (Figu [86].…”

Section: Melt Treatmentsmentioning

confidence: 99%

See 2 more Smart Citations

Recent Advances in the Grain Refinement Effects of Zr on Mg Alloys: A Review

Sun

Yang

Mao

et al. 2022

Metals

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As the lightest structural materials, Mg alloys show great effectiveness at energy saving and emission reduction when applied in the automotive and aerospace fields. In particular, Zr-bearing Mg alloys (non-Al containing) exhibit high strengths and elevated-temperature usage values. Zr is the most powerful grain refiner, and it provides fine grain sizes, uniformities in microstructural and mechanical properties and processing formability for Mg alloys. Due to the importance of Zr alloying, this review paper systematically summarizes the latest research progress in the grain refinement effects of Zr on Mg alloys. The main points are reviewed, including the alloying process of Zr, the grain refinement mechanism of Zr, factors affecting the grain refinement effects of Zr, and methods improving grain refinement efficiency of Zr. This paper provides a comprehensive understating of grain refinement effects of Zr on Mg alloys for the researchers and engineers.

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Section: Methods Of Improving the Grain Refinement Efficiency Of Zrmentioning

confidence: 99%

Section: Peritectic Reactionmentioning

confidence: 99%

Section: Melt Treatmentsmentioning

confidence: 99%

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Recent Advances in the Grain Refinement Effects of Zr on Mg Alloys: A Review

Sun

Yang

Mao

et al. 2022

Metals

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“…It is therefore feasible to manipulate the potency of a substrate through interfacial segregation of selected elements. This acts as a mechanism for the grain refining behaviour, as elucidated by experimental observations and by theoretical models and simulations [9,10,13,14,[21][22][23][24][25][26][27]. The potency variations of TiB 2 serve as excellent examples to demonstrate how a substrate's potency is manipulated by interfacial segregation.…”

Section: Introductionmentioning

confidence: 98%

Segregation of Yttrium at the Mg/MgO Interface in an Mg-0.5Y Alloy

Wang

Ramasse

et al. 2023

Preprint

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“…Chemical inoculation is utilized extensively in the grain refining of aluminum and magnesium alloys. Upon the addition of a proper grain refiner, which act as potent nucleation sites, are released and dispersed into a melt [3,4]. Ramirez et al demonstrated that the refining effect depended primarily on the selection of a nucleating catalyst [5].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Refinement of Al-Zn-Mg-Cu-Zr Alloy via Internal Cooling with Annular Electromagnetic Stirring above the Liquidus Temperature

et al. 2019

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There are two critical stages of grain refinement during solidification: above and below the liquidus temperature. The key to improve the refinement potential is ensuring the nucleation sites precipitate in large quantities and dispersed in the melt above liquidus. In this work, internal cooling with annular electromagnetic stirring was applied to an Al-Zn-Mg-Cu-Zr alloy at a temperature above liquidus. A systematic experimental study on the grain refining potential was performed by combining different melt treatments and pouring temperatures. The results indicate that internal cooling with annular electromagnetic stirring (IC-AEMS) had a significantly superior grain refining potency for the alloy compared to traditional electromagnetic stirring (EMS). In addition, homogeneous and refined grains were achieved at high pouring temperatures with IC-AEMS. The possible mechanisms for the enhanced grain refinement above the liquidus temperature are explained as the stable chilling layer around the cooling rod in IC-AEMS providing undercooling for the precipitation of Al3Zr nucleant particles and the high cooling rate restraining the growth rate of these particles. At the same time, forced convection promotes a more homogeneous distribution of nucleant particles.

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Improved Zr grain refining efficiency for commercial purity Mg via intensive melt shearing

Cited by 7 publications

References 10 publications

Recent Advances in the Grain Refinement Effects of Zr on Mg Alloys: A Review

Recent Advances in the Grain Refinement Effects of Zr on Mg Alloys: A Review

Segregation of Yttrium at the Mg/MgO Interface in an Mg-0.5Y Alloy

Enhanced Refinement of Al-Zn-Mg-Cu-Zr Alloy via Internal Cooling with Annular Electromagnetic Stirring above the Liquidus Temperature

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