Recrystallized Grain Size in Cold-Rolled and Annealed AZ31 Wrought Magnesium Alloys Affected by Rolling Direction

Itoh, Goroh; Iseno, Yohei; Motohashi, Yoshinobu

doi:10.4028/www.scientific.net/msf.419-422.355

Cited by 4 publications

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“…[10,11] If the grain size of the AZ31 billet received for use in the present work (ϳ380 m) is typical (and our experience suggests that it is), grain refinement by a factor of 10 to 80 times commonly occurs during hot rolling. The hot rolling process involves multiple cycles of rolling followed by reheating, and in a number of Mg alloys it has been reported that even finer structures can be achieved if a small number of high strain rolling passes are used.…”

Section: Introductionmentioning

confidence: 94%

Microstructural features of rolled Mg-3Al-1Zn

Barnett

Keshavarz

Nave

2005

Metall Mater Trans A

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The microstructures of hot-and cold-rolled Mg-3Al-1Zn (AZ31) are examined using scanning electron and optical microscopy. It is shown that the microstructures following multipass hot rolling and annealing are more uniform than those formed by heavy single pass rolling and annealing. The importance of twins in producing intragranular recrystallization is evident, although the most dominant nucleation site is grain boundaries. The cold-rolled structure after a rolling reduction of 15 pct is dominated by the presence of deformation twins. Twin trace analysis suggests that approximately two thirds of the twins are a form of "c-axis compression" twin. A number of "c-axis tension" twins were also observed and additional in-situ scanning electron microscopy experiments were performed to confirm earlier observations that suggest these twins can form after deformation, during unloading.

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Section: Introductionmentioning

confidence: 94%

Microstructural features of rolled Mg-3Al-1Zn

Barnett

Keshavarz

Nave

2005

Metall Mater Trans A

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Mechanical Properties and Microstructure of AZ31 Magnesium Alloy Tubes

Luo¹,

Sachdev²

2014

Essential Readings in Magnesium Technology

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Development of a New Wrought Magnesium-Aluminum-Manganese Alloy AM30

Luo

Sachdev

2007

Metall Mater Trans A

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A new wrought magnesium alloy, AM30 (Mg-3 pct Al-0.4 pct Mn), has been developed. Compared to the current workhorse commercial wrought magnesium alloy AZ31 (Mg-3 pct Al-1 pct Zn), the new AM30 alloy has 20 to 50 pct higher maximum extrusion speed, up to 50 pct ductility improvement at temperatures up to 200°C, with similar yield and tensile strengths. The tensile behavior of AM30 and AZ31 magnesium alloy tubes suggests a moderate temperature forming range of 100°C to 175°C in which strain hardening offsets plastic instability until fracture by cavity coalescence occurs. The AM30 alloy has slightly better formability than AZ31 at room and moderate temperatures, due to higher strain-hardening rates (dr/de) and exponents (n). Microstructural evaluation indicates that twinning is the major deformation mechanism for these alloys at room and moderate temperatures in addition to slip mechanisms. Dynamic recrystallization (DRX) is observed at temperatures greater thañ 150°C, which causes local instabilities to occur, leading to failure.

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Recrystallized Grain Size in Cold-Rolled and Annealed AZ31 Wrought Magnesium Alloys Affected by Rolling Direction

Cited by 4 publications

References 0 publications

Microstructural features of rolled Mg-3Al-1Zn

Microstructural features of rolled Mg-3Al-1Zn

Mechanical Properties and Microstructure of AZ31 Magnesium Alloy Tubes

Development of a New Wrought Magnesium-Aluminum-Manganese Alloy AM30

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