DEFORMATION INHOMOGENEITY IN A SINGLE CRYSTAL
DEFORMATION INHOMOGENEITY IN A SINGLE CRYSTAL NICKEL-BASE SUPERALLOY J.H. Zhang J.L. Liu T.Jin Y.B. Xu and Z.Q. Hu Institute of Metal Research Chinese Academy of Science Shenyang 110015 China Abstract The plastic inhomogeneity has been investigated in DD8 single crystal nickel-base superalloy. It has been found that this
Chat OnlineMechanisms of plastic deformation in 1¯11 -oriented
Nov 10 2016 · Single crystals of fcс Fe 20 Ni 20 Mn 20 Cr 20 Co 20 (atom percent) high entropy alloy oriented along the 1 ¯ 11 direction are used to study flow curves and deformation mechanisms—slip twinning under tensile deformation at early stages of plastic flow ε = 2.5–5.0 at the test temperature of 77 and 296 K. It is shown that twinning in 1 ¯ 11 -oriented single crystals is observed
Chat OnlineDEFORMATION INHOMOGENEITY IN A SINGLE CRYSTAL
DEFORMATION INHOMOGENEITY IN A SINGLE CRYSTAL NICKEL-BASE SUPERALLOY J.H. Zhang J.L. Liu T.Jin Y.B. Xu and Z.Q. Hu Institute of Metal Research Chinese Academy of Science Shenyang 110015 China Abstract The plastic inhomogeneity has been investigated in DD8 single crystal nickel-base superalloy. It has been found that this
Chat OnlineMicrostructure and Plastic Deformation Behavior of Ni 3 V
Plastic deformation behavior of Ni3V with D022 structure was examined using the single crystals containing two dominant variants of three. At 557 loading orientation 111 1/6<112 twinning is dominantly operative at low temperatures but 111 1/2<112 slip is activated at high temperatures accompanied by a rapid drop of yield stress.
Chat OnlineTechnical Report UDC 669 . 245 539 . 37 669 . 788
Plastic deformation plays an important role in the hydrogen embrittlement of Ni-base alloys. To clarify the effects of hydrogen on the plastic deformation and dislocation behavior of Ni-base alloys single- and poly-crystalline specimens of model alloys were observed through a transmission electron microscope after hydrogen charging.
Chat OnlineKyosuke KISHIDA Professor (Associate) Doctor of
The plastic deformation behavior of single crystals of the quinary equiatomic Cr−Mn−Fe−Co−Ni high-entropy alloy (HEA) with the face-centered cubic structure has been investigated in
Chat OnlineGrain boundary decohesion by nanoclustering Ni and Cr
Therefore it is reasonable to infer that plastic deformation can facilitate the segregation of elements Cr Ni and Mn into GBs in current HEA. However the low-level concentration of these elements is insufficient for precipitating Cr-rich σ body-centered cubic (bcc) Cr or
Chat OnlineSlip and Twinning in the 1 ̄ /line mathbf 1 49
Abstract. Using overline 1 49 oriented single crystals of an FCC Fe 20 Ni 20 Mn 20 Cr 20 Co 20 (at. ) high-entropy alloy subjected to tensile deformation the temperature dependence of critical resolved shear stresses τ cr (T) and the deformation mechanism of slip and twinning are investigated in the early stages of deformation at ∊ ≤ 5 within the temperature interval T = 77-573 K.
Chat OnlineSlip System Analysis in the Cold Rolling of a Ni3Al Single
The activated slip systems were analyzed in the cold rolling of a Ni3Al single crystal with an initial orientation of -112 (512) which showed an irregular rolling deformation i.e. widening bending and shear deformation. A phenomenological crystal plasticity model was applied using a spectral method. The boundary condition was optimized to reproduce the actual rolling deformation as follows.
Chat OnlineNondestructive evaluation of dislocation structure in
The deformation substructure in Ni 3 Fe single crystals cyclically deformed at constant plastic shear strain amplitudes (γ pl ) consisted of two phases the matrix with planar dislocation arrangement and the persistent slip band (PSB) having a three dimensional cell structure. The saturation stress remained almost constant regardless of γpl by adjusting the volume fraction of PSB.
Chat OnlinePlastic Deformations in L10-Ordered Single Crystals with
Compressive deformation of L10-ordered single crystals of FePd whose c/a ratio less than unity have been investigated from room temperature to 823 K. The results show that the critical resolved shear stress (CRSS) for octahedral glide of ordinary dislocations is smaller than that of super-lattice dislocations in all the temperature range investigated that is the opposite sense to the case of
Chat OnlineLocalization of plastic deformation in Cu and Ni single
The patterns of plastic flow in fcc Cu and Ni single crystals oriented in a way to provide easy slip are studied. The main space-time characteristics of deformation localization at the stages of easy slip and linear strengthening in these single crystals are established. The relation between the orientation of the sites of deformation localization and the crystallography of the slip systems in
Chat OnlineCreep plasticity and fatigue of single crystal
Jun 15 2011 · The combined theoretical-numerical-experimental study of the single crystal Ni-based superalloy PWA 1484 reported here increases our understanding of visco-plastic deformation in L1 2 systems it holds substantial promise for future work. In particular the model can be used to more accurately account for thermal-cyclic and for non-homogeneous
Chat OnlineRoman GRÖGER research scientist Ph.D. (University of
A series of compression tests at 77 K was carried out on chromium single crystals in magnetically isotropic state to investigate the slip activity during the first 2-4 of plastic strain.
Chat OnlineUnveiling the Re effect in Ni-based single crystal
Jan 20 2020 · Pollock T. M. Field R. D. Dislocations and high-temperature plastic deformation of superalloy single crystals. Dislocations Solids 11 547–618 (2002). CAS Article Google Scholar
Chat Online(PDF) Creep curves of Ni3Ge single crystals Experiment
response of Ni 3 Al and Ni 3 Ge single cr as a rule they are located near the stress concentrator close to the ends and in the angles of crystals. Plastic deformation is heterogeneous at high
Chat OnlineHigh-Temperature Deformation Behavior of (Mo0.85Nb0.15)Si2
The effect of alloying element (such as Cr Zr and Ir) addition on the high-temperature creep deformation behavior of C40/C11b lamellar-structured (Mo0.85Nb0.15)Si2 silicide crystals was examined. The results indicated that these additions all lead to a decrease in the steady-state creep strain rate (SSCR) when the applied stress is parallel to the lamellar interface.
Chat OnlinePlastic deformation of single crystals of the equiatomic
The plastic deformation behavior of single crystals of the quinary equiatomic Cr−Mn−Fe−Co−Ni high-entropy alloy (HEA) with the face-centered cubic structure has been investigated in
Chat OnlineFirst-principles study of the ternary effects on the
Dec 10 2020 · We studied the effects of important ternary elements such as Cr Nb and V on the plasticity of upgamma -TiAl crystals by calculating
Chat OnlineMolecular dynamics (MD) simulation of uniaxial tension of
retical strength of ideal materials depend on the way defect-free crystals would deform and fail 3 . In this investigation MD simulations of tension are carried out to study the behavior of a range of single crystal cubic metals both FCC (Al Cu and Ni) and BCC (Fe Cr and W)
Chat OnlineTechnical Report UDC 669 . 245 539 . 37 669 . 788
Plastic deformation plays an important role in the hydrogen embrittlement of Ni-base alloys. To clarify the effects of hydrogen on the plastic deformation and dislocation behavior of Ni-base alloys single- and poly-crystalline specimens of model alloys were observed through a transmission electron microscope after hydrogen charging.
Chat OnlineGrain boundary decohesion by nanoclustering Ni and Cr
Therefore it is reasonable to infer that plastic deformation can facilitate the segregation of elements Cr Ni and Mn into GBs in current HEA. However the low-level concentration of these elements is insufficient for precipitating Cr-rich σ body-centered cubic (bcc) Cr or
Chat OnlineDEFORMATION INHOMOGENEITY IN A SINGLE CRYSTAL
DEFORMATION INHOMOGENEITY IN A SINGLE CRYSTAL NICKEL-BASE SUPERALLOY J.H. Zhang J.L. Liu T.Jin Y.B. Xu and Z.Q. Hu Institute of Metal Research Chinese Academy of Science Shenyang 110015 China Abstract The plastic inhomogeneity has been investigated in DD8 single crystal nickel-base superalloy. It has been found that this
Chat OnlinePlastic deformation of Ni-Cr single crystalsNASA/ADS
Oct 01 1971 · Single crystals of nickel containing up to 21.5 at pct Cr have been deformed in tension over the temperature interval 78 to 623°K. The critical resolved shear stress of alloys containing up to 9 at. pct Cr in the region of the athermal plateau can be fitted into a C 1/2 and C 2/3 relationship where C is the concentration of chromium. The observed magnitude of
Chat OnlineOn Shear Testing of Single Crystal Ni-Base Superalloys
Shear testing can contribute to a better understanding of the plastic deformation of Ni-base superalloy single crystals. In the present study shear testing is discussed with special emphasis placed
Chat OnlineFirst-principles study of the ternary effects on the
Dec 10 2020 · We studied the effects of important ternary elements such as Cr Nb and V on the plasticity of upgamma -TiAl crystals by calculating
Chat OnlineRoman GRÖGER research scientist Ph.D. (University of
A series of compression tests at 77 K was carried out on chromium single crystals in magnetically isotropic state to investigate the slip activity during the first 2-4 of plastic strain.
Chat Online
