Microstructure and mechanical properties of Mg–Al based alloy with calcium and rare earth additions

Du, Wei; Yangshan, Sun; Min, Xin; Xue, Feng; Zhu, Min; Wu, Dongfang

doi:10.1016/s0921-5093(02)00551-8

Cited by 164 publications

(75 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…To provide the maximum strengthening effect and minimum asymmetry, it is necessary to maximize the volume fraction of basal plate precipitates and minimize the inter-particle spacing. Adding a dopant to Mg-Al alloys, such as calcium, has been shown to be effective in refining the b-Mg 17 Al 12 basal plates [45] as well as suppressing discontinuous precipitation (which is a further complication not considered here). Therefore, for the basis of this ''best case'' calculation, it is assumed that a volume fraction of 10 pct of randomly distributed basal plate precipitates of 50 nm equivalent size and aspect ratio 10 might be realistically achieved by careful alloy design and processing.…”

Section: Discussionmentioning

confidence: 99%

Effect of Precipitate Shape and Habit on Mechanical Asymmetry in Magnesium Alloys

Robson

Stanford

Barnett

2012

Metall Mater Trans A

102

View full text Add to dashboard Cite

Asymmetric yield behavior in tension and compression is a common and usually undesirable feature of wrought magnesium alloys. To prevent yield asymmetry, it is necessary to favor slip over twinning, as it is the unidirectional nature of twinning combined with the strong textures produced in wrought magnesium alloys that produce yield asymmetry. In this article, the potential to use precipitates to strengthen selectively against twin growth is discussed. The effect of precipitate's shape and habit on strengthening of slip and twinning is calculated using simple Orowan-based models. It is shown that basal plate precipitates, although being poor strengtheners against basal slip, are good strengtheners against twin growth. This is because they produce the maximum unrelaxed back-stress when they remain unsheared inside the twin. The predictions of the model have been validated against experiments for two alloys that form different precipitate types: AZ91 (basal plates). and Z5 (c-axis rods). Crystal plasticity modeling has been used to predict that an optimized distribution of basal plate precipitates is expected to strongly reduce yield asymmetry, even in strongly textured magnesium alloy.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of Precipitate Shape and Habit on Mechanical Asymmetry in Magnesium Alloys

Robson

Stanford

Barnett

2012

Metall Mater Trans A

102

View full text Add to dashboard Cite

show abstract

“…Discontinuous precipitation is the cellular growth of alternating layers of -phase and nearequilibrium magnesium matrix at high-angle grain boundaries and is the main reason for poor mechanical properties of the alloy at elevated temperatures [Celotto, 2000;Wenwen et al, 2003]. In pure AZ91 alloy, the discontinuous precipitates at grain boundaries are the main reason for poor mechanical properties of the alloy.…”

Section: Fig 5 X-ray Diffraction Pattern Of Az91-2%re Alloy Before mentioning

confidence: 99%

Improving the Properties of Magnesium Alloys for High Temperature Applications

Asl¹

2011

Magnesium Alloys - Design, Processing and Properties

View full text Add to dashboard Cite

“…In particular, AZ91 Mg alloy (Mg-9 mass%Al-1 mass%Zn-0.2 mass%Mn) has been widely used for producing cast parts for automobiles due to its good combination of castability, resistance to corrosion and room-temperature mechanical property. 1,2) Since there is a large difference in the maximum solid solubility of Al between at room temperature and at eutectic temperature in MgAl binary system, 3) AZ91 alloy can exhibit better mechanical property by forming Mg 17 Al 12 (β) precipitates in the α-Mg matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sn Addition on the Precipitation Behavior in AZ91 Magnesium Alloy

Kim

et al. 2017

Mater. Trans.

View full text Add to dashboard Cite

The effect of Sn (1, 3 and 5 mass%) addition on the precipitation behavior of AZ91 alloy has been investigated in the present study. The addition of Sn is effective in suppression of discontinuous precipitation as well as acceleration of continuous precipitation. The Mg 2 Sn particles at the grain boundary effectively reduce the nucleation sites for discontinuous β precipitates, and slow down the movement of the grain boundary. The addition of Sn remarkably enhances the aging response of AZ91. The hardness increases steeply with the start of the aging treatment, resulting in signi cantly higher peak hardness within shorter aging time. The addition of Sn enhances the aging response by solid solution hardening effect as well as by co-precipitation of Mg 17 Al 12 and Mg 2 Sn in the α-Mg matrix.

show abstract

Microstructure and mechanical properties of Mg–Al based alloy with calcium and rare earth additions

Cited by 164 publications

References 12 publications

Effect of Precipitate Shape and Habit on Mechanical Asymmetry in Magnesium Alloys

Effect of Precipitate Shape and Habit on Mechanical Asymmetry in Magnesium Alloys

Improving the Properties of Magnesium Alloys for High Temperature Applications

Effect of Sn Addition on the Precipitation Behavior in AZ91 Magnesium Alloy

Contact Info

Product

Resources

About