Tensile and Compressive Creep Behavior of Die Cast Magnesium Alloy AM60B

Agnew, Sean R.; Liu, K. C.; Kenik, E.A.; Viswanathan, S.

doi:10.1002/9781118808962.ch39

Cited by 21 publications

(13 citation statements)

References 14 publications

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“…The uniform strains and fracture strains are slightly lower for the extruded sheet than for the rolled sheet. The stress levels in the TD are higher compared to the RD, which is a typical finding that has been associated with the angular tilt of basal planes being broader towards the RD than the TD [7,22]. For the extruded sheet, this relationship is not initially clear.…”

Section: Mechanical and Forming Properties Of The Sheetsmentioning

confidence: 96%

“…The latter orientation is especially unfavorable for any deformation test. Then, the preferential activation of basal slip is supposed to determine the mechanical behavior [7,22]. Furthermore, grain size effects apply: the smaller the average grain size, the higher the stress levels achieved, especially for the yield stresses.…”

Section: Development Of Mechanical and Forming Propertiesmentioning

confidence: 99%

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Processing Effects on the Formability of Magnesium Alloy Sheets

Bohlen

Cano

Drozdenko

et al. 2018

Metals

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Abstract:As a generalized semi-finished product, the use of magnesium sheets requires addressing two major aspects of their processing: their microstructure and texture control, which are both essential for the forming behavior of such sheets during their forming to parts. Further, the processing of such sheets is complex, and therefore expensive, and requires simplification. In this work, magnesium alloys AZ31, ZE10, and ME21 are investigated in the form of conventionally rolled sheets, as well as in the form of extruded sheets. Their microstructural and textural development are correlated to their mechanical and forming properties. During extrusion, strong textures develop that hinder stretch-forming operations, even in rare earth-containing alloys. Chemical composition and process parameters have a significant impact on the texture development, and enable the design of sheet materials with weak textures and potentially enhanced formability.

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Section: Mechanical and Forming Properties Of The Sheetsmentioning

confidence: 96%

Section: Development Of Mechanical and Forming Propertiesmentioning

confidence: 99%

Processing Effects on the Formability of Magnesium Alloy Sheets

Bohlen

Cano

Drozdenko

et al. 2018

Metals

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“…By taking into account the minimum creep rate's temperature dependence, the correlation in Figure 13 cannot be justified because for the same effective stress levels, the minimum creep rate at 175 C should not be smaller than that at 150 C. [78][79][80][81][82] Agnew et al conducted creep studies on AM60 (Mg-5Al-0.2 Mn) with a stress range of 20-60 MPa and suggested dislocation climb to be the main creep mechanism. [83] As for the die-cast AM50 (Mg-5Al-0.2 Mn), with a higher stress of 100 MPa at 150-225 C, the creep mechanism was also determined to be dislocation climb. [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.…”

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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“…The stress exponent n and the apparent activation energy [16][17][18][19][20] . That is, the compressive creep mechanism is determined by grain boundary diffusion where n =1.…”

Section: Resultsmentioning

confidence: 99%

Study on Compressive Creep Behavior of AE42 and AE41-xCa Alloys

Xu¹

2015

Proceedings of the 2nd International Conference on Civil, Materials and Environmental Sciences

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The compressive creep behavior of AE42 and AE41-xCa alloys were investigated at temperatures in the range of 125~175 and compressive stresses in the range of ℃ 88~112MPa with a special apparatus. The results show that the creep resistance of alloys is improved with increasing of calcium concentration, and the compressive creep strain and steady state compressive creep rate increases obviously with increasing of temperature and compressive stress. There is a good linear logarithmic relationship between s ε& ln versus σ ln or 1/T under different temperatures or stresses, respectively. The steady creep rate obeys an empirical equation. The stress exponent n, the apparent activation energy Q a of AE42 alloy is 5.39 and 90.41KJ/mol respectively, and the stress exponent n, the apparent activation energy Q a of AE41-1.2Ca alloy is 6.24 and 37.51KJ/mol respectively, which indicates that the compressive creep mechanism is changed with the addition of Ca.

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Tensile and Compressive Creep Behavior of Die Cast Magnesium Alloy AM60B

Cited by 21 publications

References 14 publications

Processing Effects on the Formability of Magnesium Alloy Sheets

Processing Effects on the Formability of Magnesium Alloy Sheets

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

Study on Compressive Creep Behavior of AE42 and AE41-xCa Alloys

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