Direct evidence for Suzuki segregation and Cottrell pinning in MP159 superalloy obtained by FEG(S)TEM/EDX

Han, Guohao; Jones, I.P.; Smallman, R.E.

doi:10.1016/s1359-6454(02)00359-2

Cited by 95 publications

(30 citation statements)

References 8 publications

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“…All alloying elements that used in this calculation decreased the ratio of stable and unstable SFE of pure Co. Then, it has an increasing impact on the emission of partial dislocations. TEM studies of pure Co and some Cobased alloys 1,8,9,15 have observed a significant amount of extended partial dislocations, confirmed the calculations in the present study and also demonstrate the role of first-principles calculations for making predictions of the structural modeling. Ranking of the binary Co-X alloys can be ordered in the sequence as shown in Fig.…”

Section: Co-based Alloy Design Based On First-principles Calculationssupporting

confidence: 88%

“…Alloying with the transition and rare-earth metals are widely used in Mg-alloys that can significantly improve the mechanical properties, especially the addition of rare-earth metals 7 . Certain alloying elements could significantly change the SFE from the experiments or theoretical simulation, for example, Co-Fe, Co-Ni and Co-Ni-Cr based alloy 8,9 , but it is still insufficient for Co-based alloys. A theoretical SFE calculation, such as first-principles and thermodynamic method, is an effective method to discover the effect of various elements on the SFE and the mutual correlations between the elements 10 .…”

Section: Introductionmentioning

confidence: 99%

“…The first-principles calculation in this paper shows that alloying with Mo and La atoms has a high tendency to segregate in SF plane. Experimental characterization of Co-based superalloy MP159 by Han et al 9 also reported the segregation of Mo atoms to the stacking fault plane. …”

mentioning

confidence: 97%

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Co-based alloys design based on first-principles calculations: Influence of transition metal and rare-earth alloying element on stacking fault energy

Achmad

Chen

et al. 2017

AIP Conference Proceedings

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Section: Co-based Alloy Design Based On First-principles Calculationssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Co-based alloys design based on first-principles calculations: Influence of transition metal and rare-earth alloying element on stacking fault energy

Achmad

Chen

et al. 2017

AIP Conference Proceedings

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“…An electron probe of $1 nm makes it possible to measure directly elemental composition across the nanoscale region. 26 To understand the thermal stability of the SMATed TLM, the specimens cut from the 30-min SMATed plate were encapsulated in quarts tubes with vacuum of 7 Â 10 À4 Pa to receive annealing treatment at 200, 300, and 400 C for 6 h, respectively, and XRD analyses were performed.…”

Section: Methodsmentioning

confidence: 99%

Deformation-induced ambient temperature α-to-β phase transition and nanocrystallization in (α + β) titanium alloy

Han

Zhuang

2009

J. Mater. Res.

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Ambient temperature a-to-b phase transition and nanocrystallization in the aged Ti-25Nb-3Mo-3Zr-2Sn titanium alloy was achieved by surface mechanical attrition treatment (SMAT). The phase transition occurs at a/b interfaces and extends to a phase interiors with increasing strain. It is irreversible and diffusion controlled. The stressinduced increase of Gibbs energy and enrichment of Nb may cause a high order of lattice instability of the a phase adjacent to the a/b interfaces and compel the a phase to b phase. The presence of fine a needles in the aged alloy and the phase transition from a to b with increasing strain are viewed to play a crucial role in the subsequent nanostructuring.

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“…It has been proposed that the segregation of solute atoms toward the stacking fault ribbons of an extended dislocation is enhanced significantly during deformation in the DSA temperature regime. [49][50][51] Following solute segregation, it becomes more difficult for extended screw dislocations to cross slip owing to the increase in their dissociation width. In superalloy, the increased dislocation width of dislocations and larger and more stacking faults following deformation in the DSA regime has been interpreted as a result of the reduction in stacking fault energy.…”

Section: B Influence Of Temperature and Strain Rate On Dislocation Bmentioning

confidence: 99%

Kinetics of Uniaxial Tensile Flow and Work Hardening Behavior of Type 316L(N) Austenitic Stainless Steel in the Framework of Two-Internal-Variable Approach

Christopher

Choudhary

2014

Metall Mater Trans A

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tensile flow and work hardening behavior of type 316L(N) austenitic stainless steel have been examined in the framework of two-internal-variable approach based on the evolution of forest dislocation density and mean free path with plastic strain in the temperature range from 300 K to 1023 K (27°C to 750°C) and strain rates ranging from 3.16 9 10 À5 to 3.16 9 10 À3 s À1 . The steel exhibited three-stage work hardening behavior in the variations of hr d with r d , where hr d is the product of instantaneous work hardening rate, h (h = dr d /de p ) and flow stress contribution from dislocation (r d ), and e p is the true plastic strain. The threestage work hardening was characterized by a gradual increase in hr d at low stresses (transient stage) followed by a linear increase in hr d in stage-II and inverted parabolic hardening at high r d in stage-III. At all the strain rate and temperature conditions, the flow and work hardening behavior was appropriately described by the two-internal-variable model. The work hardening parameters such as dynamic recovery parameter and final mean free path, and the predicted forest, mobile, and total dislocation densities at uniform plastic strain exhibited three distinct temperature regimes. Anomalous variations in the work hardening parameters with respect to temperature and strain rate observed at intermediate temperatures have been ascribed to the occurrence of dynamic strain aging. At high temperatures, dominance of dynamic recovery has been observed.

show abstract

Direct evidence for Suzuki segregation and Cottrell pinning in MP159 superalloy obtained by FEG(S)TEM/EDX

Cited by 95 publications

References 8 publications

Co-based alloys design based on first-principles calculations: Influence of transition metal and rare-earth alloying element on stacking fault energy

Co-based alloys design based on first-principles calculations: Influence of transition metal and rare-earth alloying element on stacking fault energy

Deformation-induced ambient temperature α-to-β phase transition and nanocrystallization in (α + β) titanium alloy

Kinetics of Uniaxial Tensile Flow and Work Hardening Behavior of Type 316L(N) Austenitic Stainless Steel in the Framework of Two-Internal-Variable Approach

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