Tensile properties of AZ61 magnesium alloy produced by multi-pass friction stir processing: Effect of sample orientation

In this research, one solid state processing technique, friction stir processing, is applied to modify the AZ61 magnesium alloy billet. The FSP modified AZ61 alloy could be refined to 3-8 μm via the dynamic recrystallization during processing. The AZ61 magnesium alloy billet with 75μm grain size could be refined to about 7.5μm by four-pass friction stir processing. The hardness of the stirred zone could increase to around 70-80 after friction stir processing, and after a further compressive strain of about 3% could raise the hardness to 81. The ductility of the weld direction specimens of the modified alloy could have a 235% elongation at 300°C and 1x10-4 s-1. The grain boundary sliding (GBS) might be the dominant deformation mechanism during superplastic deformation.

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Stretch Formability of an AZ61 Alloy Plate Prepared by Multi-Pass Friction Stir Processing

Materials ◽

10.3390/ma14123168 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3168

Author(s):

Xicai Luo ◽

Haolin Liu ◽

Limei Kang ◽

Jielin Lin ◽

Yifei Liu ◽

...

Keyword(s):

Magnesium Alloy ◽

Grain Refinement ◽

Friction Stir Processing ◽

Room Temperature ◽

Applied Load ◽

Alloy Plate ◽

Friction Stir ◽

Az61 Magnesium Alloy ◽

Az61 Alloy ◽

Stretch Formability

The stretch formability behavior of an AZ61 magnesium alloy plate produced by multi-pass friction stir processing (M-FSP) was investigated, with the applied load vs. displacement curves recorded during Erichsen cupping tests at different punching speeds at room temperature. The stretch formability of M-FSP AZ61 magnesium alloy was significantly enhanced, compared with that of its cast counterpart. The highest Erichsen index of 3.7 mm was obtained at a punching speed of 0.1 mm/min. The improved stretch formability was mainly attributed to the grain refinement stemming from the M-FSP and the presence of extension twinning to accommodate deformation during Erichsen cupping testing.

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Using friction stir processing to produce ultrafine-grained microstructure in AZ61 magnesium alloy

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(08)60098-9 ◽

2008 ◽

Vol 18 (3) ◽

pp. 562-565 ◽

Cited By ~ 33

Author(s):

Xing-hao DU ◽

Bao-lin WU

Keyword(s):

Magnesium Alloy ◽

Friction Stir Processing ◽

Friction Stir ◽

Az61 Magnesium Alloy ◽

Ultrafine Grained ◽

Ultrafine Grained Microstructure

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Tensile Properties and Microstructural Evolution of Friction Stir Processed Extruded AZ31B Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.110-116.606 ◽

2011 ◽

Vol 110-116 ◽

pp. 606-610 ◽

Cited By ~ 1

Author(s):

S. Ramesh Babu ◽

V.S. Senthil Kumar ◽

V. Balasubramanian ◽

G. Madhusudhan Reddy

Keyword(s):

Magnesium Alloy ◽

Tensile Properties ◽

Friction Stir Processing ◽

Base Material ◽

Processing Parameters ◽

Mechanical Twinning ◽

Ideal Condition ◽

Az31b Magnesium Alloy ◽

Friction Stir ◽

Az31b Alloy

Friction stir processing (FSP) is an emerging surface modification technology for enhancing the sheet metal properties through microstructural refinement at a particular region which might undergo severe plastic deformation. The extruded AZ31B magnesium alloy used in this investigation exhibits very limited ductility accompanied by brittle like behavior at room temperature because of hexagonal packed structure and severe mechanical twinning. Hence, an attempt was made to study the effect of processing parameters such as tool rotational speed and tool traversing speed on tensile properties of friction stir processed AZ31B magnesium alloy. It is found that the friction stir processing of the Magnesium alloy improved the ductility of the material when compared to the base material and also produced an ultrafine equiaxed grain in the processed zone, an ideal condition for the material to exhibit superplasticity.

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