Creep deformation mechanisms in high-pressure die-cast magnesium-aluminum-base alloys

Blum, W.; Li, Y. J.; Zeng, Xia; Zhang, Peng; Grossmann, B. von; Haberling, Christoph

doi:10.1007/s11661-005-0036-0

Cited by 72 publications

(22 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sample preparation for EBSD was mechanically polished and chemically etched in a solution of 5 ml nitric acid, 15 ml acetic acid, 20 ml water and 60 ml ethanol for 1-2 s. A step size of 1.5 or 3 μm was used to collect the EBSD data using a TSL OIM EBSD system fitted to a Camscan 44FE SEM. as "tertiary-dominated creep" [14] or "extended tertiary creep" [15,16] . In the tertiary creep regime, the creep strain rate increased with increasing time and creep strain until rupture occurred.…”

Section: Methodsmentioning

confidence: 99%

Creep and Fracture Behavior of Peak-Aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct)

Yin

Wang

Boehlert

et al. 2012

Metall Mater Trans A

View full text Add to dashboard Cite

The tensile-creep and creep-rupture behavior of heat-resistant peak-aged Mg-11Y-5Gd-2Zn-0.5Zr (wt.%) (WGZ1152) was investigated at T=523-598K (0.58-0.66T m ) and stresses between 30MPa to 140MPa. The minimum creep rate of the alloy was almost two orders of magnitude lower than that for WE54-T6, and was comparable to that for HZ32-T5. The creep behavior exhibited an extended tertiary creep stage, which was believed to be associated with precipitate coarsening. The creep stress exponent value was 4.5, suggesting that dislocation creep was the rate-controlling mechanism. The activation energy for creep (221±20kJ/mol) was higher than that for self-diffusion in magnesium, and was believed to be associated with the activation of non-basal slip and cross slip. This was consistent with the surface deformation observations, which revealed a transition from basal slip to non-basal slip and cross slip with increasing temperature. The minimum creep rate and rupture time followed the original and modified Monkman-Grant relationships. The microcracks and cavities preferentially nucleated at grain boundaries and at the interface between Mg matrix and the second phase. In-situ creep experiments highlighted the intergranular cracking evolution.

show abstract

Section: Methodsmentioning

confidence: 99%

Creep and Fracture Behavior of Peak-Aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct)

Yin

Wang

Boehlert

et al. 2012

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…[44,45] It is well established that second phases in ductile materials are known to increase strength for which the theory is well established. [46][47][48] In alloys containing a ductile primary phase, the strain hardening is related to the volume fraction and modulus of the dispersed particles for strains lower than 1 pct.…”

Section: A Microstructure/tensile Properties Relationshipmentioning

confidence: 99%

Evaluation of Magnesium Die-Casting Alloys for Elevated Temperature Applications: Microstructure, Tensile Properties, and Creep Resistance

Zhu

Easton

Abbott³

et al. 2015

Metall Mater Trans A

124

View full text Add to dashboard Cite

Several families of magnesium die-casting alloys have been developed to operate at the elevated temperatures experienced in automotive powertrain applications. Most alloys are based on the Mg-Al system with alloying additions such as silicon, strontium, calcium, and rare earth elements (RE), although alloys with RE as the primary alloying constituent are also considered. This work presents an evaluation of the tensile properties and creep resistance of the most common magnesium die-casting alloys, in conjunction with the analysis of microstructure. The alloys investigated include AS31 (Mg-3Al-1Si), AJ52 (Mg-5Al-2Sr), MRI153A (Mg-9Al-1Ca-0.1Sr), MRI153M (Mg-8Al-1Ca-0.3Sr), MRI230D (Mg-6.5Al-2Ca-1Sn-0.3Sr), AXJ530 (Mg5Al-3Ca-0.2Sr), AE42 (Mg-4Al-2RE), AE44 (Mg-4Al-4RE), and AM-HP2+ (Mg-3.5RE-0.4Zn). It is shown that, among the various alloys evaluated, MRI230D, AXJ530, and AM-HP2+ have higher yield strength than the Al alloy A380, but the ductility is relatively low at room temperature for these alloys. In contrast, AS31 and the AE series alloys have very good room temperature ductility, but their yield strength is lower than that of A380. In terms of creep resistance, MRI230D, AXJ530, AE44, and AM-HP2+ are all comparable to the Al alloy counterpart at 423 K and 448 K (150°C and 175°C). Microstructural factors that are most important to the strength and creep resistance of the Mg die-casting alloys are discussed.

show abstract

“…Therein, the Mg-Si based alloys have attracted more and more attention since the 1970s when the AS41 and AS21 (Mg-Al-Si) alloys were developed [1,2]. The Mg-Si particles mainly exist in Mg-Al (Zn)-Si alloys in the form of Mg 2 Si for reinforcement.…”

Section: Introductionmentioning

confidence: 99%

First-Principles Study of Chemical and Topological Short-Range Orders in the Mg–Si Liquid Alloys

Liú

Zhu

Qin

et al. 2016

Metals

View full text Add to dashboard Cite

Abstract:The structures of a series of Mg-Si liquid alloys were investigated by means of ab initio molecular dynamic simulation. The pair distribution function analysis manifests a tendency of aggregating for the Si-Si pairs in the Mg 90 Si 10 liquid alloy. Chemical short-range orders are observed around Si atoms between unlike atoms, and the maximum is observed for the eutectic Mg 47 Si 53 alloy. Furthermore, the topological environment changed abruptly near the eutectic Mg 47 Si 53 alloy according to Voronoi polyhedra analysis. The variation of diffusion coefficients of Mg and Si suggests that the dynamical properties of Mg-Si liquid alloys are more sensitive to temperature than to compositions.

show abstract

Creep deformation mechanisms in high-pressure die-cast magnesium-aluminum-base alloys

Cited by 72 publications

References 13 publications

Creep and Fracture Behavior of Peak-Aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct)

Creep and Fracture Behavior of Peak-Aged Mg-11Y-5Gd-2Zn-0.5Zr (wt pct)

Evaluation of Magnesium Die-Casting Alloys for Elevated Temperature Applications: Microstructure, Tensile Properties, and Creep Resistance

First-Principles Study of Chemical and Topological Short-Range Orders in the Mg–Si Liquid Alloys

Contact Info

Product

Resources

About