Effect of the rotation rate on the low-cycle fatigue behavior of friction-stir welded AZ31 magnesium alloy

Wen, Wang; Han, Pengcheng; Qiao, Ke; Li, Tianqi; Wang, Kuaishe; Cai, Jun; Wang, Liqiang

doi:10.1016/j.engfracmech.2020.106925

Cited by 23 publications

(11 citation statements)

References 47 publications

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“…Grain refinement of the SZ was attributed to reduction in tool rotational speed and vice versa. This is also supported for other Mg alloys [154,170].…”

Section: Effect Of Input Parameters On Microstructure and Mechanical Propertiessupporting

confidence: 71%

“…The main disadvantage is the difficulty in joining more than two components at a time. There is also the need to fill very wide root gaps since it does not require the use of filler materials [153]. There is no melting involved in SSW and weld appearance are great with improved mechanical properties at the weld joint [49].…”

Section: Solid State Weldingmentioning

confidence: 99%

“…The SSW technique is classified under different categories. These include cold welding, ultrasonic welding, roll welding, forge welding, pressure welding, friction welding, diffusion welding, explosion welding, and friction stir welding [154]. Friction stir welding (FSW) is widely use as it is flexible and allows for all sorts of metals to be jointed.…”

Section: Solid State Weldingmentioning

confidence: 99%

“…By defining and optimizing the input parameters, structural integrity of the weld joints and the mechanical properties can be improved. The effect of low rotation speed on improved fatigue life of AZ31 Mg FSW joints has been studied [154].…”

Section: Effect Of Input Parameters On Microstructure and Mechanical Propertiesmentioning

confidence: 99%

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Welding of magnesium and its alloys: an overview of methods and process parameters and their effects on mechanical behaviour and structural integrity of the welds

et al. 2021

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An overview of welding methods and process parameters and its effects on mechanical behaviour and structural integrity of magnesium and its alloys are discussed. These alloys are less dense and beneficial structural alloys for improved energy efficiency, eco-friendliness and driver of circular economic model for sustainable design and innovative ecosystem. While the application of Mg-alloys is projected to increase, understanding the mechanical behaviour and structural integrity of welded joints are critical. Thus, fusion and solid-state welding processes of these alloys are discussed with emphasis on mechanical characterization. Laser welding is the most effective fusion welding technique for most Mg alloys whereas, the predominant solid-state method is friction stir welding. The importance of process variables such as heat inputs, welding velocity (speed) and post weld treatments on the microstructural evolution, on mechanical and physical properties of the distinct zones of the weld joints are described. The weldment is the most susceptible to failure due to phase transformation, defects such as microporosity and relatively coarse grain sizes after solidification. The implication of the design of quality weld joints of Mg alloys are explored with areas for future research directions briefly discussed.

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“…Grain refinement of the SZ was attributed to reduction in tool rotational speed and vice versa. This is also supported for other Mg alloys [154,170].…”

Section: Effect Of Input Parameters On Microstructure and Mechanical Propertiessupporting

confidence: 71%

Section: Solid State Weldingmentioning

confidence: 99%

Section: Solid State Weldingmentioning

confidence: 99%

Section: Effect Of Input Parameters On Microstructure and Mechanical Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Welding of magnesium and its alloys: an overview of methods and process parameters and their effects on mechanical behaviour and structural integrity of the welds

et al. 2021

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“…The Coffin–Manson formula and the Basquin equation have been extensively utilized to predict the low‐cycle fatigue life of various materials, yielding prediction results that are consistent with test results. [ 26–29 ]

\frac{Δ ε}{2} = \frac{Δ ε_{e}}{2} + Δ ε_{normalp} / 2

…”

Section: Resultsmentioning

confidence: 99%

Effect of Heat Treatment on Low‐Cycle Fatigue Performance of LZ91 Mg–Li Alloy

Liu

et al. 2021

Adv Eng Mater

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Herein, the effects of heat treatment on the microstructure, tensile properties, and low‐cycle fatigue properties of the LZ91 Mg–Li alloy are investigated. The results indicate that after heat treatment, the α‐phase undergoes spheroidization, and a portion of the needle‐like α‐phase is distributed at the β‐phase grain boundary; in addition, the ultimate tensile strength (UTS) and elongation of the material increase by 9.6% and 20%, respectively, and the low‐cycle fatigue life is improved. The increase in the UTS of the specimen is attributed to the precipitation of the needle‐like α‐phase, whereas that in material plasticity is attributed to α‐phase spheroidization after heat treatment. It is observed that fatigue cracks all originate on the surface of the specimens, predominantly in the β‐phase. The needle‐like α‐phase suppresses the initiation of macro fatigue cracks, and the increased α‐phase microhardness decelerates the crack growth rate, thereby improving the low‐cycle fatigue life of the alloy.

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