Dependence of flow strength and deformation mechanisms in common wrought and die cast magnesium alloys on orientation, strain rate and temperature

Xu, Su; Tyson, W. R.; Eagleson, R.; Zavadil, Renata; Liu, Z.; Mao, Pingli; Wang, C.-Y.; Hill, Susan I.; Luo, Alan A.

doi:10.1016/j.jma.2013.11.003

Cited by 31 publications

(7 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It indicates that the CRSS of basal slip and twinning are strainrate independent, while the CRSS of non-basal slip have a positive strain-rate dependence. This is in agreement with the results from previous studies (Ref 17,24,31).…”

Section: Discussionsupporting

confidence: 94%

Mechanical Behavior and Microstructural Analysis of Extruded AZ31B Magnesium Alloy Processed by Backward Extrusion

Zhou

Beeh

Friedrich

et al. 2016

J. of Materi Eng and Perform

View full text Add to dashboard Cite

This study investigates the mechanical behavior of an extruded AZ31B magnesium alloy profile at various strain rates from 0.001 to 375/s. The electron backscatter diffraction analysis revealed that the profile has 0001 f gh1010i and f1010gh1120i textures. Due to the textures, the profile exhibits pronounced anisotropy in mechanical properties. In the extrusion direction (ED), the profile shows the highest yield strength (YS) but the lowest total elongation at fracture (TE) due to a hard activation of non-basal slip and f1011gh1012i twinning; in the diagonal direction (DD), it shows the lowest ultimate tensile strength (UTS) but the highest TE due to an easy activation of basal slip; in the transverse direction (TD), it shows the lowest YS due to an easy activation of f1012gh1011i twinning. Moreover, the number of twins increases with the increasing strain rate. This indicates that deformation twinning becomes prevalent to accommodate high-rate deformation. Due to the different deformation mechanisms, the profile exhibits an orientation-dependent effect of strain rate on the mechanical properties. A positive effect of strain rate on the YS and UTS was found in the ED, while the effect of strain rate on the YS is negligible in the DD and TD. The TE in the ED, DD, and TD decreases in general as the strain rate increases. Fractographic analysis under a scanning electron microscope revealed that the fracture is a mixed mode of ductile and brittle fracture, and the magnesium oxide inclusions could be the origins of the fracture.

show abstract

Section: Discussionsupporting

confidence: 94%

Mechanical Behavior and Microstructural Analysis of Extruded AZ31B Magnesium Alloy Processed by Backward Extrusion

Zhou

Beeh

Friedrich

et al. 2016

J. of Materi Eng and Perform

View full text Add to dashboard Cite

show abstract

“…The J ‐integral and the J‐R curve have become the most important material parameters in EPFM due to their usefulness in measuring fracture toughness, making them widely applied in engineering applications. According to Xu et al and the stress‐strain curves extracted in previous sections, power laws can well describe the behaviour of this alloy. Hence, a power law expression was employed for the definition of the material in finite element analysis and J‐R curve extraction.…”

Section: Finite Element Analysismentioning

confidence: 73%

“…In 2013, the behaviour of stress-strain curves of AM50 and AM60 alloys under various strain rates were examined in the temperature range of −150°C to 100°C, and the results obtained based on power law could well describe the behaviour of these alloys. 21 As mentioned, different research works have focused on various temperature ranges for Mg alloys. Nevertheless, in a research performed in 2008, focusing on breakdown micromechanisms, the temperature range of −40°C to 150°C was reported as suitable operating temperature range for the alloys, with the material strength attenuated abruptly beyond this temperature range.…”

Section: Introductionmentioning

confidence: 99%

“…Gariboldi and Chen et al tried to extract fracture toughness of casted AM60 alloy subjected to various heat treatments and reported postheat treatment fracture toughness of 15 to 30 MPa·m 1/2 . In 2013, the behaviour of stress‐strain curves of AM50 and AM60 alloys under various strain rates were examined in the temperature range of −150°C to 100°C, and the results obtained based on power law could well describe the behaviour of these alloys . As mentioned, different research works have focused on various temperature ranges for Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and numerical investigation of the effect of temperature on mixed‐mode fracture behaviour of AM60 Mg alloy

Oskui

Soltani

2019

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

The aim of present paper is to experimentally investigate mixed‐mode fracture behaviour of AM60 Mg alloy at low and elevated temperatures. For this purpose, mode I, 45° mixed‐mode, and mode II tests were conducted using a modified version of Arcan device at three different temperatures. An elastic‐plastic finite element model was used to extract necessary geometric parameters. Crack resistance curves (J‐R) and critical J‐integral of the material were extracted. The results indicated that, for all loading modes, maximum critical J‐integral value was observed at ambient temperature and decreased by either increasing or decreasing the temperature. It was observed that effect of temperature on fracture behaviour is much larger at temperatures above 0°C rather than sub‐zero temperatures. By changing the loading angle to go from mode I to mode II, a decreasing trend was observed in the values of critical fracture parameters at all temperatures. Finally, the surfaces were examined using scanning electron microscopy (SEM).

show abstract

“…In forming applications, these issues can be overcome by increasing the forming temperature because more deformation mechanisms can be activated [35]. Another predominant feature of wrought magnesium alloys is the strain rate sensitivity in tension and compression [32,33,42,46], which offers an advantage in energy absorption (EA) in crash scenarios.…”

Section: Introductionmentioning

confidence: 99%

Dynamic bending behaviour of magnesium alloy rectangular thin-wall beams filled with polyurethane foam

Zhou¹,

Beeh²,

Kriescher³

et al. 2016

International Journal of Crashworthiness

View full text Add to dashboard Cite

This study proposes a hybrid structural design concept of polyurethane foam-filled magnesium alloy AZ31B rectangular thin-walled beams which serve as energy absorbing components in automotive applications. Uniaxial tensile and compressive tests, and fracture tests were performed to investigate the material mechanical properties. Dynamic three-point bending tests were performed to study the deformation/fracture modes and energy absorption capacity for the foamfilled AZ31B beams, and to compare these mechanical properties with those for mild steel DC04 beams. Different AZ31B beams were filled with a variation of foam density (0.05, 0.20 and 0.30 g/ cm 3 ). It was found that the AZ31B beam filled with 0.20 g/cm 3 foam reached the highest specific energy absorption; moreover, it absorbed more energy and reached much higher specific energy absorption than the foam-filled DC04 beam filled with the same foam, although the former one was nearly 54% lighter. The potential advantage of the foam-filled AZ31B beams is possibly associated with the high work hardening rate of AZ31B sheet in compression, which may involve more material in plastic deformation compared with the foam-filled DC04 beams. It has therefore been demonstrated that the hybrid structural design concept of the polyurethane foam-filled AZ31B beam has potential applications in auto-body structures.

show abstract

Dependence of flow strength and deformation mechanisms in common wrought and die cast magnesium alloys on orientation, strain rate and temperature

Cited by 31 publications

References 10 publications

Mechanical Behavior and Microstructural Analysis of Extruded AZ31B Magnesium Alloy Processed by Backward Extrusion

Mechanical Behavior and Microstructural Analysis of Extruded AZ31B Magnesium Alloy Processed by Backward Extrusion

Experimental and numerical investigation of the effect of temperature on mixed‐mode fracture behaviour of AM60 Mg alloy

Dynamic bending behaviour of magnesium alloy rectangular thin-wall beams filled with polyurethane foam

Contact Info

Product

Resources

About