Texture and microstructure evolution of A390 aluminum alloy during ECAP

Damavandi, Esmaeil; Nourouzi, Salman; Rabiee, Sayed Mahmood; Jamaati, Roohollah

doi:10.1088/2053-1591/ab13be

Cited by 14 publications

(3 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[7][8][9] In recent years, SPD techniques are widely applied in producing the UFG structures in bulk metallic alloys. [10][11][12][13][14] Equal channel angular pressing (ECAP), 15,16 high pressure torsion (HPT), equal channel angular rolling (ECAR), [18][19][20] constrained groove pressing, [21][22][23][24][25] non-equal channel angular pressing 26 and cyclic close die forging (CCDF) 27 are some of the SPD processes which have been recently investigated.…”

Section: Introductionmentioning

confidence: 99%

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:

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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:

View full text Add to dashboard Cite

show abstract

“…16 In recent years, severe plastic deformation (SPD) procedures are broadly used to produce the ultra-fine grained (UFG) structures in bulk metallic alloys. [22][23][24][25][26][27] Equal channel angular pressing (ECAP), 28,29 highpressure torsion (HPT), 30 accumulative roll bonding (ARB), 31 equal channel angular rolling (ECAR), 32 constrained groove pressing (CGP) [33][34][35] and cyclic close die forging (CCDF) 36 are some of the SPD processes which have been recently investigated. Nowadays, the study of the effect of the SPD process on RS formation and distribution has become an interesting subject.…”

Section: Introductionmentioning

confidence: 99%

Improving the mechanical properties and reducing the residual stresses of AA7075 by combination of cyclic close die forging and precipitation hardening

Moazam

Honarpisheh

2020

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

As one of the major strengthening mechanisms, the precipitation hardening is used to enhance the mechanical properties of aluminum alloys. Based on the results of the residual stress measurement, after fast quenching, the core of the material is under tensile stress while the surfaces are under compressive residual stress. Distortion commonly happens during the machining of precipitation-hardened aluminum alloys due to the residual stresses created during the quenching step in the heat treatment process. In this study, the combination of cyclic close die forging and precipitation hardening was used to improve the mechanical properties and control the residual stresses of AA 7075, simultaneously. According to the results, a considerable level of residual stresses was developed in the sample after the quenching step. Performing the cyclic close die forging process immediately after the quenching step changed the pattern of the residual stresses and reduced them significantly. The reduction of the residual stresses after the first pass of cyclic close die forging was about 50%, while after two passes, the sample was almost fully stress relieved. Besides, the results of the microhardness and uniaxial tensile tests demonstrated the improvement of the mechanical properties of the processed samples when compared to the T6 condition. Also, in comparison to AA 7075-T6, the yield stress, ultimate tensile stress, and microhardness were increased by about 24%, 22%, and 48%, respectively.

show abstract

“…Many researchers have reported different methods which are available under severe plastic deformation [SPD] for improving the wear resistance properties of the materials. Few typical SPD techniques includes accumulative roll-bonding [9][10][11], multiaxial forging [12,13], high pressure torsion [14,15], repetitive corrugation and straightening [16,17] and equal channel angular pressing [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Impact of ECAP on wear performance of Al–Mn magnesium alloy

Gopi¹,

2020

Mater. Res. Express

View full text Add to dashboard Cite

The current study examines the wear performance of deformed AM90 magnesium alloy using pin-ondisc wear test apparatus under varying load of 30 and 40 N with the sliding distance of 2500 m and 5000 m at constant sliding speed of 3 m s −1 . The samples were processed through equal channel angular pressing were subjected to microstructural, wear studies and are characterized by optical and scanning electron microscopy. Vickers microhardness was carried out to evaluate the relation between the wear behavior of homogenized and ECAP processed samples. Increment in number of ECAP passes increased the grain refinement as observed in the microstructure with reduction in grain size from ∼70 μm (homogenized sample) to ∼4 μm (ECAP 4 pass sample). Increase in wear resistance and hardness were observed for processed samples and the worn faces are analyzed by scanning electron microscopy and energy-dispersive x-ray spectrometer. The worn surfaces revealed the occurrence of wear debris, delamination, ploughing in the direction of sliding and the predominant wear mechanism was considered to be the combination of oxidation and abrasive wear.

show abstract

Texture and microstructure evolution of A390 aluminum alloy during ECAP

Cited by 14 publications

References 43 publications

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

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

Improving the mechanical properties and reducing the residual stresses of AA7075 by combination of cyclic close die forging and precipitation hardening

Impact of ECAP on wear performance of Al–Mn magnesium alloy

Contact Info

Product

Resources

About