Ultrasonically assisted friction stir welding of aluminium alloy 6061

K., H.; He, Diping; Liu, J. S.

doi:10.1179/1362171814y.0000000275

Cited by 37 publications

(22 citation statements)

References 28 publications

(31 reference statements)

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“…In the literature, many studies have reported a positive relationship between hardness of the softened zone and tensile shear load [17]. Therefore, the hardness of the softened zone can be considered as a factor affecting peak load.…”

Section: Explanation Of Decreased Peak Loadmentioning

confidence: 99%

The quantitative investigation of mechanical properties and characterization of fractured position for friction stir lap welded A6111/A5023

2015

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Section: Explanation Of Decreased Peak Loadmentioning

confidence: 99%

The quantitative investigation of mechanical properties and characterization of fractured position for friction stir lap welded A6111/A5023

2015

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“…Ultrasonic vibration or impact is known to mitigate the level of residual stress in welded joints 24,25 or due to machining. 26 Liu and co-workers 27 show that the simultaneous application of electropulsing and ultrasonic treatment leads to a favourable surface structure in stainless steel.…”

Section: H K D H Bhadeshiamentioning

confidence: 99%

The Electrical Processing of Materials

Bhadeshia¹

2015

Materials Science and Technology

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High frequency pulses of electrical current have long been known to induce dramatic changes in the structure and properties of materials, 1 including for example, the healing of internal cracks in microseconds 2,3 and electrically induced plasticity as an aid to shape forming. [4][5][6] If the temperature rise associated with the pulsing is sufficient, then the dislocation density can be affected even if the pulse duration is just a few millionths of a second. 7 In a recent editorial, I commented on the promise of the method, which thus far has not had any major exploitation, and on the need for a theoretical framework that is quantitatively predictive. 8 To explore these ideas further, a critical assessment was commissioned, 9 the conclusions from which can be paraphrased as follows:1. it is possible that the method may replace thermomechanical processing because the capital requirement is smaller, at least on the laboratory scale that has been explored thus far. 2. That there is no single case where theory has been applied quantitatively. 3. That speculation regarding the contribution of electrical energy to the free energy of transformation has yet to be justified [to the same extent that stress and magnetic fields have been incorporated into phase diagram calculations]. 4. That in phase mixtures, the variation in electrical resistivity or magnetic properties of the individual phases may determine the structural response to electropulsing. There evidently is a lot to be done, so the next step in the assessment of the field became obvious, to initiate a compilation of papers on the subject, with all those active in the field according to the knowledge databases, invited to contribute.

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“…Revisiting of extrusion cutting was attempted in the beginning of the twenty-first century [61][62][63][64][65][66][67][68]. A research team from Purdue University obtained patent US 7,617,750 (2009) "Process of producing nanocrystalline bodies" and filed patent application US 2014/0017113 (2014) "Large strain extrusion machining processes and bulk forms produced therefrom."…”

Section: Large Strain Extrusionmachining (Lsem)mentioning

confidence: 99%

“…To show that this is the case, consider the developments and results presented in patent US 7,617,750 (2009), patent application US 2014/0017113 (2014) and paper [66] by essentially the same team of researchers. The patented equipment shown in Fig.…”

Section: Large Strain Extrusionmachining (Lsem)mentioning

confidence: 99%

“…The strain analysis presented in patent US 7,617,750 (2009), patent application US 2014/0017113 (2014), and papers [63,66] is based on the "cutting (extrusion) ratio" defined as the ratio of the unreformed chip thickness and chip thickness, i.e., reciprocal to the chip compression ratio defined by Eq. (1.15) and used by De Chiffre in its modeling and experimental studies of extrusion-cutting [52,54], introduced in metal cutting by Time [69] and then used by many researchers [36,70].…”

Section: Large Strain Extrusionmachining (Lsem)mentioning

confidence: 99%

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