Characterization of microstructures obtained in wedge shaped Al–Zn–Mg ingots

Suárez, Marı́a Dolores; Alvarez, Omar; Alvarez, M.A.; Rodrı́guez, Ricardo; Valdez, S.; Juárez, José Antonio Caballero

doi:10.1016/j.jallcom.2009.11.106

Cited by 13 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The microstructures of the alloys solidified in the iron mold (Figures 1d-f) The wedge-shaped ingots provided different cooling rates, allowing the evaluation of the microstructure evolution as a function of chemical composition and cooling rates 19,20 . Figure 2 shows the microstructures of the three alloys obtained in the upper, middle and tip parts of the wedge shaped ingot.…”

Section: Microstructural Characterization Of Alloys In the As-cast Comentioning

confidence: 99%

Study of the Al-Si-X system by different cooling rates and heat treatment

et al. 2012

View full text Add to dashboard Cite

The solidification behavior of the Al-12.6% Si (A1), the hypereutectic Al-20%Si (A2) and the Al-20%Si-1.5% Fe-0.5%Mn (A3) (in wt. (%)) alloys, at different cooling rates is reported and discussed. The cooling rates ranged between 0.93 °C/s and 190 °C/s when cast in sand and copper wedge-shaped molds, respectively. A spheroidization heat treatment was carried out to the alloys in the as-cast condition at 540 °C for 11 hours and quench in water with a subsequent heat treatment at 170 °C for 5 hours with the purpose of improving the mechanical properties. The samples were characterized by optical microscopy, scanning electron microscopy and mechanically by tensile test, in order to evaluate the response of the heat treatment on the different starting microstructures and mechanical properties. It was found that alloys cooled at rates greater than 10.8 °C/s had a smaller particle size and better distribution, also showed a greater response to spheroidization heat treatment of all silicon (Si) phases. The spheroidization heat treatment caused an increase in the ultimate tensile stress (UTS) and elongation when compared with the alloys in the as-cast condition. The highest UTS value of 174 MPa was obtained for the (A1) alloy.

show abstract

Section: Microstructural Characterization Of Alloys In the As-cast Comentioning

confidence: 99%

Study of the Al-Si-X system by different cooling rates and heat treatment

et al. 2012

View full text Add to dashboard Cite

show abstract

“…In order to fabricate nanoscale QCs, we improved the cooling condition in this paper by using a wedge-shaped copper mold 11 and adjusted the components of the alloys. The multiplex spherical nano-QCs are successfully synthesized and their electrochemical properties were researched in simulated seawater.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and corrosion resistance of Mg-Zn-Y-based nano-quasicrystals alloys

et al. 2012

View full text Add to dashboard Cite

A wedge-shaped copper mold was used to fabricate micro quasicrystals(QCs). Stable Mg-Zn-Ybased nano-QCs were directly synthesized through this simple route instead of crystallization from metallic glasses or complicated forming processes at high temperature. The study showed that on the tips of the wedge-shaped ingots, the minimum diameter of nano-QCs approach to 4~6 nm. The main size of nano-QCs is about 10~30 nm. The maximum microhardness of QCs has been dramatically improved to about HV440 which increased by about 280% compared with that of the petal-like QCs fabricated under common cast iron mold cooling conditions. Possessing a certain negative enthalpy of mixing and existence of Frank-Kasper-type phases determined the formation of Mg-Zn-Y-based nano-QCs.

show abstract

“…In past work, we have synthesized quarternary spherical Mg-Zn-Y-based QC phase [19] by controlling compositions and undercooling conditions of the melts. In order to fabricate nanoscale QCs, we improve the cooling condition in this paper by using a water-cooled wedge-shaped copper mould [20]. Multicomponent spherical nano-QCs are successfully synthesized and their electrochemical properties are investigated in simulated seawater.…”

Section: Introductionmentioning

confidence: 99%

Direct Preparation of Nano‐Quasicrystals via a Water‐Cooled Wedge‐Shaped Copper Mould

Wang

Zhao

Qin

et al. 2011

Journal of Nanomaterials

View full text Add to dashboard Cite

We have successfully synthesized multicomponent Mg-based nano-quasicrystals (nano-QCs) through a simple route by using a water-cooled wedge-shaped copper mould. Nanoscale QCs are prepared directly on tip of wedge-shaped castings. The further study shows that nano-QCs in the Mg71Zn26Y2Cu1alloy show well microhardness of greater than HV450. Electrochemical properties of three kinds of quasicrystal alloys are investigated in simulated seawater. The Mg71Zn26Y2Cu1nano-QC alloy presents the best corrosion resistance in this study for the formation of well-distributed nano-QC phases (1~5 nm) and polygonal Mg2(Cu,Y) nanophases (40~50 nm).

show abstract

Characterization of microstructures obtained in wedge shaped Al–Zn–Mg ingots

Cited by 13 publications

References 12 publications

Study of the Al-Si-X system by different cooling rates and heat treatment

Study of the Al-Si-X system by different cooling rates and heat treatment

Fabrication and corrosion resistance of Mg-Zn-Y-based nano-quasicrystals alloys

Direct Preparation of Nano‐Quasicrystals via a Water‐Cooled Wedge‐Shaped Copper Mould

Contact Info

Product

Resources

About