Ring-core integral method to measurement residual stress distribution of Al-7075 alloy processed by cyclic close die forging

Moazam, Mohammad Ali; Honarpisheh, Mohammad

doi:10.1088/2053-1591/ab29b6

Cited by 10 publications

(12 citation statements)

References 41 publications

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“…Many other researches were also performed to study the SPD effects on the behavior of the AA7075. However, to the best of the authors’ knowledge, excluding Moazam and Honarpisheh, 32 Liddicoat et al. 35 and Nam et al.…”

Section: Introductionmentioning

confidence: 96%

“…The authors in their previous work 32 performed 15 passes of CCDF on the AA7075 specimens at 200 C. Nevertheless, the obtained mechanical properties were very lower than the T6 condition. The authors also studied the residual stress formation and distribution due to precipitation hardening and stress relieving of AA7075.…”

Section: Introductionmentioning

confidence: 98%

“…On the other hand, the formation of the metastable precipitates during the SPD processing of the heattreatable aluminum alloys prevents the deformability of the materials at ambient temperature. [30][31][32] Several researches were carried out to solve this problem. Zhao et al 33 solutionized the 20-mm rod of AA7075 at 480 C for 5 h and in the next step, they performed two passes of the ECAP process immediately after quenching the sample at room temperature and reported that the higher yield point and ultimate strength in the processed samples were due to the higher densities of the G-P zones and the dislocations.…”

Section: Introductionmentioning

confidence: 99%

“…Many other researches were also performed to study the SPD effects on the behavior of the AA7075. However, to the best of the authors' knowledge, excluding Moazam and Honarpisheh, 32 Liddicoat et al 35 and Nam et al 31 who used the CCDF, HPT and ECAR, the other researchers used the ECAP to achieve the UFG in Al 7XXX series alloys.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the formation of the metastable precipitates during the SPD processing of the heat-treatable aluminum alloys prevents the deformability of the materials at ambient temperature. 30–32 Several researches were carried out to solve this problem. Zhao et al.…”

Section: Introductionmentioning

confidence: 99%

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The effects of combined cyclic close die forging and aging process on microstructure and mechanical properties of AA7075

Moazam

Honarpisheh

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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It is well known that applying severe plastic deformation methods on the precipitation hardenable aluminum alloys at room temperature is very difficult because of crack formation and segmentation of the specimen during the processes. In this study, several procedures were experimentally examined for performing the cyclic close die forging (CCDF) and improving the mechanical properties of AA7075. The experimental tests revealed that supersaturated solid solution of AA7075 after water quenching is formable for only about 5 min and performing the CCDF process in this limited time is possible. Optical and scanning electron microscopy and transmission electron microscopy were used to study the microstructure of the processed samples. It was observed that by applying two passes of CCDF, the grain size of the material reduced from 30 µm to about 200–300 nm. In addition, the X-ray diffractometer results demonstrated that Guinier–Preston zone picks of the processed samples are very weak and the equilibrium η-phase does not exist in none of the suggested procedures. Furthermore, it was found that by combining CCDF and aging processes according to the proposed procedures, the mechanical properties of the processed AA7075 were improved when compared with the AA7075-T6. To put it more clearly, micro-hardness, yield strength and ultimate tensile stress of the processed sample were improved as much as 38.6%, 25% and 23%, respectively.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 98%