Influences of complex modification of P and RE on microstructure and mechanical properties of hypereutectic Al-20Si alloy

Chen, Chong; Liu, Zhongxia; Ren, Bo; Wang, Mingxing; Weng, Yue; Liu, Zhiyong

doi:10.1016/s1003-6326(07)60089-2

Cited by 85 publications

(42 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This has been explained [2] to result from the formation of strontium phosphide or sodium phosphide upon the addition of strontium or sodium to phosphorus pre-refined alloys. Other investigations have shown that adding rare earth elements would result in modification and refinement of the primary and eutectic silicon particles [5,6].…”

Section: Introductionmentioning

confidence: 99%

Nanoreinforced Cast Al-Si Alloys with Al2O3, TiO2 and ZrO2 Nanoparticles

El-Mahallawi

Shash

Amer

2015

Metals

View full text Add to dashboard Cite

This study presents a new concept of refining and enhancing the properties of cast aluminum alloys by adding nanoparticles. In this work, the effect of adding alumina (Al2O3), titanium dioxide (TiO2) and zirconia (ZrO2) nano-particles (40 nm) to the aluminum cast alloy A356 as a base metal matrix was investigated. Alumina, titanium dioxide and zirconia nano-powders were stirred in the A356 matrix with different fraction ratios ranging from (0%-5%) by weight at variable stirring speeds ranging from (270, 800, 1500, 2150 rpm) in both the semisolid (600 °C) and liquid (700 °C) state using a constant stirring time of one minute. The cast microstructure exhibited change of grains from dendritic to spherical shape with increasing stirring speed. The fracture surface showed the presence of nanoparticles at the interdendritic spacing of the fracture surface and was confirmed with EDX analysis of these particles. The results of the study showed that the mechanical properties (strength, elongation and hardness) for the nanoreinforced castings using Al2O3, TiO2 and ZrO2 were enhanced for the castings made in the semi-solid state (600 °C) with 2 weight% Al2O3 and 3 weight% TiO2 or ZrO2 at 1500 rpm stirring speed.

show abstract

Section: Introductionmentioning

confidence: 99%

Nanoreinforced Cast Al-Si Alloys with Al2O3, TiO2 and ZrO2 Nanoparticles

El-Mahallawi

Shash

Amer

2015

Metals

View full text Add to dashboard Cite

show abstract

“…A widely used method of influencing the microstructure of silicon precipitations in Al-Si alloys is the modification by ultrafine particles of compounds of rare-earth and refractory metals [2][3][4][5][6][7]. In this article, it is shown that the introduction of modifiers leads to a change in the temperatures of basic solidification processes and, accordingly, the morphology of basic structural-phase component materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of Modifying Mixtures on Si Crystal Formation in Al-7%Si Alloy

Zykova

Казанцева

Попова

et al. 2018

Metals

View full text Add to dashboard Cite

Using scanning and transmission electron microscopy, we studied silicon particles formed during the solidification of Al-7%Si alloy when different modifying mixtures were introduced into the melt: (1) a mixture of ultrafine powders Na 3 AlF 6 + K 2 ZrF 6 + TiO 2 + ZrO 2 ; (2) K 2 ZrF 6 ; and (3) the flux Arsal. By differential scanning calorimetry, it was established that modifying mixtures significantly influenced the temperature of the solidification processes. The formation of two types of Si crystals was established. The first type of Si crystals precipitated during the solidification of the eutectic mixture (α-Al + Si) in the form of needles or plates. The second type of Si crystals was segregated from eutectic Al-phases or segregated from the solid phase α-Al upon cooling in the solid state. The introduction of modifiers led to a shift in solidification temperatures. When fluoride salts were used, there was an increase in the temperature of eutectic solidification. Silicon crystals were large (up to 10 µm), with a local excess of aluminum concentration.

show abstract

“…A widespread method influencing the uniform formation of the microstructure and enhancement of strength properties of AlSi alloys is modification of super-and nano-dispersed particles of different chemical compositions [3][4][5][6][7]. The basic nanodimensional modifiers used for silumins are the powders of metal oxide and nitrides [3,4,8].…”

Section: Introductionmentioning

confidence: 99%

Influence of soaking time of modifier in melt on microstructure of Al-12%Si alloys

Martyushev

Bashev

Zykova

2017

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

To cite this article: N V Martyushev et al 2017 IOP Conf. Ser.: Mater. Sci. Eng. 177 012118 View the article online for updates and enhancements. Related contentFatigue life of silumin irradiated by high intensity pulsed electron beam S V Konovalov, K V Alsaraeva, V E Gromov et al. Abstract. The influence of the soaking time of the silumin melt with a modifying nanopowder W on the microstructure and the impact toughness of the Al-12%Si silumin is studied in the paper. It was established that when introducing 0.1 mass. % of W and soaking it for 10 min, up to 30% of the inassimilable nanopowder W remains in the crucible after pouring. At that, the microstructure of castings is refined, and the impact toughness increases by 12 % compared to the initial alloy. It was established that the powder remaining in the crucible after melting consists of the remnants of metallic W, WO 3 and W 3 O. Nanopowder W is completely assimilated by the melt if the soaking time is increased by 120 min; in this case, the impact toughness reduces, which is connected with the increase of dendrites and silicon wafers sizes.

show abstract

Influences of complex modification of P and RE on microstructure and mechanical properties of hypereutectic Al-20Si alloy

Cited by 85 publications

References 15 publications

Nanoreinforced Cast Al-Si Alloys with Al2O3, TiO2 and ZrO2 Nanoparticles

Nanoreinforced Cast Al-Si Alloys with Al2O3, TiO2 and ZrO2 Nanoparticles

Influence of Modifying Mixtures on Si Crystal Formation in Al-7%Si Alloy

Influence of soaking time of modifier in melt on microstructure of Al-12%Si alloys

Contact Info

Product

Resources

About