Impact of Ce-base mischmetal on the microstructure and mechanical behavior of ZK60 magnesium casting alloys

Silva, E.P.; Marques, F.D.S.; Nossa, Tamires de Souza; Alfaro, Ulises; Pinto, Haroldo Cavalcanti

doi:10.1016/j.msea.2018.02.024

Cited by 33 publications

(10 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Among these specimens, ATZE7311 alloy exhibited the desirable combination of strength and ductility under tested conditions with the UTS, YS and Ef of ~239 MPa, ~108 Mpa, and ~19.6% at RT, and they are ~148 MPa, ~102 Mpa, and ~28% at 175 °C, improved by ~9.6%, ~24.3%, and ~53.8%, respectively, compared to ATZ731 alloy. It needs to be mentioned that the excessive Mm addition dropped the strength and ductility compared to ATZE7311 alloy, which was similar to the RE-containing Mg alloys, such as Y-adding AZ91 and Mm-adding ZK60 alloys [38,41,42]. Generally, the fracture models of Mg alloys are a mixture of cleavage and quasicleavage characters due to the limited plastic manners of {001}<110> dislocation slip and {102}<101> twin for Mg alloys at RT [43].…”

Section: Tensile Properties and Fracture Morphologiesmentioning

confidence: 75%

Effects of Ce-Rich Misch Metal on the Microstructures and Tensile Properties of as-Cast Mg-7Al-3Sn-1Zn Alloys

Liu

Sun

Xiao

et al. 2021

Metals

View full text Add to dashboard Cite

The effects of small amounts of Ce-rich misch metal (Mm: 0.5, 1.0 and 2.0 wt.%) addition on the microstructure and tensile properties of as-cast Mg-7Al-3Sn-1Zn wt.% (ATZ731) alloy have been investigated. The addition of Mm restricts the formation of the Mg17Al12 phase but greatly promotes the Al4Mm phase. The proper Mm addition enhances the strength and ductility of ATZ731 alloys at both room temperature (RT) and 175 °C. ATZ731 alloys with 1.0 wt.% Mm addition exhibit an advantageous combination strength and ductility, with the ultimate tensile strength (UTS), 0.2% yield strength (YS) and elongation to failure (Ef) at 175 °C of ~148 MPa, ~102 MPa and ~28%, improved by ~14.7%, ~24.3% and ~53.8%, respectively, compared to those of ATZ731 alloy. This enhancement is primarily owing to the refined microstructures and the high thermal stability of Al4Mm at the elevated temperature in contrast with that of the Mg17Al12 phase. The fracture modes are also discussed.

show abstract

Section: Tensile Properties and Fracture Morphologiesmentioning

confidence: 75%

Effects of Ce-Rich Misch Metal on the Microstructures and Tensile Properties of as-Cast Mg-7Al-3Sn-1Zn Alloys

Liu

Sun

Xiao

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…In an overall view, the rheocasting samples (Fig. 7aee) showed a mixed ductilebrittle fracture mode with the presence of cleavage facets, quasicleavage planes and irregular dimples in the a-magnesium matrix [28], while the conventional casting sample (Fig. 7f) presented a fully brittle fracture aspect with cleavage planes, river patterns and micro-cracks.…”

Section: Resultsmentioning

confidence: 99%

Effect of solid fraction on microstructures and mechanical properties of a Mg-Al-La-Ca alloy processed by rheocasting

Bartex

Santos

Barcellos

et al. 2019

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…They showed that the mechanical properties could be affected by the type, volume fraction, and morphology of the intermetallic phases. It has been reported elsewhere that the tensile behavior of Mg-Zn-Zr alloy is significantly improved by RE addition (Y and Ce), which is due to the grain refinement and formation of different intermetallic phases [12,15].…”

Section: Introductionmentioning

confidence: 89%

Effect of Ce Addition on the Tribological Behavior of ZK60 Mg-Alloy

et al. 2020

View full text Add to dashboard Cite

The present work aims to study the tribological behavior of an extruded ZK60 alloy in the presence of Ce; in a previous study, among ZK60 alloys with different Ce addition rates, an alloy with 3 wt% of Ce was found to exhibit the most promising mechanical (e.g., hardness and strengths) properties, while its wear behavior remained unknown. The results of microstructural examinations by optical and electron microscopes show that Ce addition reduces the grain size from 6.1 to 2.0 μm. Besides, in addition to the precipitates already distributed in the base alloy (Mg 7 Zn 3), Ce could promote the formation of a new precipitate (MgZn 2 Ce), increasing the total fraction of the precipitates. These microstructural evolutions enhance the strengths of the studied ZK60 alloy, as the yield and tensile strengths increase from 212 to 308 MPa and from 297 to 354 MPa, respectively. A pin on disc tribometer was employed to study the wear behavior of the developed alloy under different normal loads (5, 20, 40, and 60 N). The results show that the base and Ce-added alloys exhibit almost a similar frictional behavior, while the wear resistance of the Ce-added alloy is higher within the load ranges applied: (i) in low load conditions (5 and 20 N), where the abrasive wear is the active mechanism, the precipitates in the Ce-added alloy could enhance the wear resistance. (ii) Under the load of 40 N, oxidative wear is also an operative wear mechanism, leading to a sharp increase in the wear rate of the alloys. In this condition, Ce could provide a protective oxide layer, which could improve the wear resistance of the alloy. (iii) At a load of 60 N, both studied alloys exhibit a similar wear rate due to a severe oxidation condition. Therefore, beyond this loading condition, the microstructural evolutions (e.g., change in precipitation behavior) caused by Ce addition can no longer contribute to the enhancement of wear resistance.

show abstract

Impact of Ce-base mischmetal on the microstructure and mechanical behavior of ZK60 magnesium casting alloys

Cited by 33 publications

References 18 publications

Effects of Ce-Rich Misch Metal on the Microstructures and Tensile Properties of as-Cast Mg-7Al-3Sn-1Zn Alloys

Effects of Ce-Rich Misch Metal on the Microstructures and Tensile Properties of as-Cast Mg-7Al-3Sn-1Zn Alloys

Effect of solid fraction on microstructures and mechanical properties of a Mg-Al-La-Ca alloy processed by rheocasting

Effect of Ce Addition on the Tribological Behavior of ZK60 Mg-Alloy

Contact Info

Product

Resources

About