Creep studies of AZ91D pressure die casting

Regev, M.; Aghion, Eli; Rosen, A.

doi:10.1016/s0921-5093(97)00215-3

Cited by 78 publications

(22 citation statements)

References 5 publications

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“…They were found to be 10.0 for DieMag211, 8.1 for DieMag422 and 7.8 for DieMag633. All of these values are higher compared to value of n = 5.4 at 180 °C, which were found in common die cast alloys like AZ91 [14]. Luo [15] reported, in a comparable alloy AC53 (5 % Al, 3 % Ca), stress exponents of 8.5 at high stress levels (70-97 MPa) and concluded, that creep deformation was dislocation controlled.…”

Section: Light Metals Technology 2013mentioning

confidence: 82%

Creep Behaviour Under Compressive Stresses of Calcium and Barium Containing Mg-Al-based Die Casting Alloys

Dieringa

Zander

Gibson

2013

MSF

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Abstract. The development of creep resistant high pressure die casting (HPDC) alloys is one of the main focuses in magnesium research. Alloying elements like rare earths, calcium, strontium or scandium added to the necessary aluminium for die casting have already been introduced. Newly developed barium containing magnesium alloys with three levels of alloying additions were processed via HPDC and their compression creep response at 200 °C was evaluated. DieMag633 (Mg-6Al-3Ba-3Ca) displays the best creep resistance followed by DieMag422 (Mg-4Al-2Ba-2Ca) and then DieMag211 (Mg-2Al-1Ba-1Ca). Stress exponents from tests at different applied stresses were calculated. The creep tests were also accompanied by microstructural investigations and mechanical property evaluation.

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Section: Light Metals Technology 2013mentioning

confidence: 82%

Creep Behaviour Under Compressive Stresses of Calcium and Barium Containing Mg-Al-based Die Casting Alloys

Dieringa

Zander

Gibson

2013

MSF

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“…[84] Within the same temperature domain, Suzuki et al studied the creep mechanism of AX53 (Mg-5AL-3Ca) alloy to be the same with a stress of 100 MPa and here basal and non-basal slips were reported and it was seen that non-basal slip increased as the temperature and strain increased. [85] Kunst et al performed multilevel temperature creep tests at the same temperature range (The creep tests were performed with constant load but multi-level temperature (MLT)), on AJ62 þ Al (Q ¼ 147 kJ mol À1 and n ¼ 8) and concluded the creep mechanism as lattice diffusion. The high n value may be due to the presence of a threshold stress due to precipitation hardening.…”

Section: Mg-al Alloysmentioning

confidence: 99%

“…Figure 22 depicts the SEM image of an Mg-4.1Zn-0.2Y alloy after creep deformation at 150 C with stress of 30 MPa. [85,86] In addition, Pekguleryuz and Celikin reported dislocation climb at the temperature range of 70-150 C with n value of 4 on ZC63 (Mg-6Zn-3Cu) with a stress of 30-50 MPa. [7] Meanwhile, at a higher temperature range of 150-200 C, he reported the GBS on Mg-Zn-Zr alloys with a stress range of 30-40 MPa and the n vale was determined to be 4.…”

Section: Mg-al Alloysmentioning

confidence: 99%

A Review of Different Creep Mechanisms in Mg Alloys Based on Stress Exponent and Activation Energy

et al. 2015

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Magnesium being the lightest structural material, is being increasingly used in automotive industry but at elevated temperatures, alloys like AZ91D, AM60B, AM50A etc. exhibit poor creep resistance which hinders the powertrain applications. This article summarizes the various creep deformation mechanisms prevailing in magnesium alloys at elevated temperatures by the influence of elemental additions. The main creep mechanisms are found to be dislocation climb, diffusion creep, and grain boundary sliding. The variation of creep mechanisms for different Mg alloys with respect to the activation energy (Q), stress exponent (n) for different stresses and temperatures are reported.

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“…Many studies have been conducted on the creep behavior of alloy AZ91 produced by various casting technologies, including die casting, [4][5][6][7] ingot casting, [8] squeeze casting, [9,10] and thixoforming. [11,12] The creep tests were generally conducted in the temperature range 120 to 200 °C, since the maximum operating temperature for AZ91 seldom or never exceeds 200°C.…”

Section: Introductionmentioning

confidence: 99%

Creep and rupture properties of a squeeze-cast Mg-Al-Ca alloy

Zhu

Mordike

Nie

2006

Metall Mater Trans A

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A squeeze-cast Mg-Al-Ca alloy (MRI153) was creep tested at 150, 175, and 200 °C under applied stresses in the range of 30 to 120 MPa. The creep curves were characterized by an extended tertiary stage in which the creep rate increases progressively with the creep strain. Microstructural examinations revealed the precipitation and coarsening of new particles during creep. The stress dependence of the minimum creep rate suggests a transition from power-law creep at low stresses to power-law breakdown at high stresses. Creep rupture of this alloy occurred as a result of cavitation damage at dendritic grain boundaries, with the creep rupture time and the minimum creep rate following the empirical Monkman-Grant equation. A comparison is made between the creep and rupture properties of MRI153 and those of a squeeze-cast Mg-Al alloy (AZ91).

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Creep studies of AZ91D pressure die casting

Cited by 78 publications

References 5 publications

Creep Behaviour Under Compressive Stresses of Calcium and Barium Containing Mg-Al-based Die Casting Alloys

Creep Behaviour Under Compressive Stresses of Calcium and Barium Containing Mg-Al-based Die Casting Alloys

A Review of Different Creep Mechanisms in Mg Alloys Based on Stress Exponent and Activation Energy

Creep and rupture properties of a squeeze-cast Mg-Al-Ca alloy

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