Microstructural processes of plastic instabilities in strengthened metals

Luft, A.

doi:10.1016/0079-6425(91)90002-b

Cited by 148 publications

(80 citation statements)

References 249 publications

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“…However, the orientation of the maximum shear stress planes varies depending on the elastic andor plastic anisotropy as well as the stress state [ 181. As far as response of the material to shear stress is concerned, there is a broad range of behaviors that may lead to plastic strain localization, as reviewed by Luft [19]. Low local strain-hardening rate and low strain rate sensitivity encourage localization, and when their values become negative they may cause tensile plastic instability.…”

Section: Deformation Behavior Beyond Yieldingmentioning

confidence: 99%

Slip analysis in a Ni-base superalloy

2005

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A Ni-base superalloy single crystal with y/y' structure was tested at room temperature along the , <110> and <111> directions. Consistent with previously reported investigations, this alloy did not obey the Schmid law and the CRSS (critical resolved shear stress) was noticeably lower for the < 1 1 1 >-oriented samples. Furthermore, the strain hardening rate decreased and the degree of deformation localization increased in the order of <111>, and <110> orientations. The appearance and orientation of deformation traces were found to depend on the loading orientation as well as the amount of strain. In general, when y'-particles were sheared, the traces followed the expected octahedral shear planes. It is demonstrated that the wavy deformation traces that do not follow the { 11 1 ] planes are associated with changes in the y-channels width and the falling off of the ;/'-particles. In this paper the evolution of deformation bands are discussed in terms of plastic localization at microscopic, mesoscopic and macroscopic levels.

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Section: Deformation Behavior Beyond Yieldingmentioning

confidence: 99%

Slip analysis in a Ni-base superalloy

2005

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“…102,103 Greenfield and Wilsdorf 104 were the first who observed an area free of irradiation defects in the middle of a slip-line cluster by TEM in a neutron-irradiated copper single crystal. Extensive studies were conducted to establish the correlation between the deformation behavior and the slip-line structure in neutron-irradiated copper single crystals.…”

Section: Dislocation Channelingmentioning

confidence: 99%

Physical and Mechanical Properties of Copper and Copper Alloys

Li¹,

Zinkle²

2012

Comprehensive Nuclear Materials

173

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“…This additional back stress can be accounted for, at the intra-granular scale, by introducing a non-linear kinematic strain hardening term [29,38] , similar to the Armstrong-Frederick law, [39] as shown in Eqs. [11] and [12]. The non-linear evolution of the kinematic strain hardening is needed as plastic accommodation occurs between the channel and the neighboring grains by channel propagation.…”

Section: Intragranular Kinematic Strain Hardeningmentioning

confidence: 99%

“…The so-called dislocation channeling mechanism has been observed in various irradiated metals and alloys, as reviewed by Wechsler [11] and Luft. [12] In the case of zirconium alloys, several authors have reported defect-free channels [13][14][15][16][17][18][19] Recently, an extensive study [9,20] of this phenomenon has been conducted on neutron-irradiated recrystallized zirconium alloys tested at 623 K (350°C). It has been established that for neutron-irradiated material strained during tensile test performed in the transverse direction or an internal pressure (IP) test on cladding tube, channels are parallel to the basal plane and are well explained in terms of basal slip.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Slip Systems Activation in Neutron-Irradiated Zirconium Alloys and Comparison with Polycrystalline Model Simulations

Onimus

Béchade

Gilbon

2012

Metall Mater Trans A

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The deformation mechanisms of recrystallized zirconium alloys are strongly influenced by neutron irradiation with significant consequences on the mechanical behavior at the macroscopic scale. It is especially observed, through transmission electron microscopy, that the dislocation channeling process in the basal plane is the main deformation mechanism after irradiation. A polycrystalline modeling which takes into account both the specific post-irradiation deformation mechanisms, and the texture of the material has been developed. This physically based model reproduces the mechanical behavior of the material for both monotonic and cyclic tests. The slip system activities have been computed for several grains observed by TEM. The activation of the basal slip is very well predicted. Moreover, the activation of hc+ai-pyramidal slip observed only in few grains, and the absence of prismatic activation is also well predicted showing the reliability of the modeling.

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Microstructural processes of plastic instabilities in strengthened metals

Cited by 148 publications

References 249 publications

Slip analysis in a Ni-base superalloy

Slip analysis in a Ni-base superalloy

Physical and Mechanical Properties of Copper and Copper Alloys

Experimental Analysis of Slip Systems Activation in Neutron-Irradiated Zirconium Alloys and Comparison with Polycrystalline Model Simulations

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