The temperature and concentration dependence of the stacking fault energy in the Co-Ni system

Ericsson, Torsten

doi:10.1016/0001-6160(66)90006-x

Cited by 202 publications

(51 citation statements)

References 14 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%

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%

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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“…Thus, discarding all elements beyond J 1 is sufficient for most metals since the difference between ∆E ISF and ∆E ESF is small relative to other fault energies [10,11,12]. The observation that the ∆E ISF is closely related to the difference between the formation energies of the fcc and hcp phases has been well known and explained in the literature [13,14,12] and the ANNNI model has been used extensively to calculate the ∆E ISF of several transition metals [15], as well as the effect of solute atoms on the ∆E ISF of Fe [7,8,9] and Ni [16] and compared well with ∆E ISF obtained using the conventional supercell approach. In the case of the L1 2 ordered compound, a SISF is effectively equivalent to the ISF for the super-lattice.…”

Section: Axial Next Nearest Neighbour Ising Model (Annni)mentioning

confidence: 99%

Alloying Effects in the γ' Phase of Co-based Superalloys

Mottura¹,

Janotti²,

Pollock³

2012

Superalloys 2012 (Twelfth International Symposium)

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New γ/γ Co-based alloys appear to be a promising set of materials for use in the hottest parts of gas turbines. Recent work has shown that these alloys behave similar to conventional Ni-based superalloys and preliminary designs have produced alloys with remarkable strength at high temperatures. Understanding the behavior of solute elements in these alloys is essential for improving their properties and designing viable alloys. In this work, ab initio simulations are used to study the effects of additional elements on fault energies in the γ phase. Initial investigation shows that both Ta and Ti retain a strong preference for the second sub-lattice in the γ phase. Calculations also show that these elements increase the superlattice intrinsic stacking fault energy of the γ precipitates while promoting the stability of the γ phase relative to other crystal structures. This work indicates that the stability and resistance to dislocation penetration of the γ phase in these alloys are closely linked and are strongly affected by chemical bonding rather than the size of solute atoms.

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“…Since stacking fault energy is low in L-605 alloy [21], most of the work hardening occurs at the beginning of the deformation process by rapid movement of dislocations in easy glide system. Due to large amount of work hardening and subsequently increase in stored energy in L-605 alloy [4], it seems that recrystallization is the dominant phenomenon in comparison with recovery.…”

Section: Hardnessmentioning

confidence: 99%

An assessment of static recrystallization in L-605 Cobalt-based superalloy

2016

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In this research, the effect of cold rolling, annealing time and temperature on microstructure and hardness were studied in L-605 superalloy. A cast bar of L-605 alloy was hot rolled at 1200ºC. As the following, it was solutionized at 1230 ºC for 1 hour and finally was cold rolled by different amounts (i.e. 5-35 percent thickness reduction). The cold-rolled samples were heat treated for different times (i.e. 2-120 min.) at temperature range of 1068-1230 ºC in order to study their recrystallization behavior. The results of microstructural analysis indicated that static recrystallization is responsible for microstructural refinement and coarsening, so that an increase in the amounts of cold rolling resulted in a fully recrystallized microstructure at lower temperature. This analysis also indicated that annealing temperature is more effective than annealing time in grain growth. Microstructural evaluation as well as showed that carbides such as M7C3 and M23C6 which have been reported in some literature were not observed during rolling or annealing in this research. It is perhaps due to usage of high annealing temperatures or possibly due to their very low contents which was not possible for us to evaluate their formation with conventional methods. Hardness results revealed that higher annealing temperature lead to lower hardness values as expected.

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The temperature and concentration dependence of the stacking fault energy in the Co-Ni system

Cited by 202 publications

References 14 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

Alloying Effects in the γ' Phase of Co-based Superalloys

An assessment of static recrystallization in L-605 Cobalt-based superalloy

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The temperature and concentration dependence of the stacking fault energy in the Co-Ni system

Cited by 202 publications

References 14 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

Alloying Effects in the &gamma;' Phase of Co-based Superalloys

An assessment of static recrystallization in L-605 Cobalt-based superalloy

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Alloying Effects in the γ' Phase of Co-based Superalloys