PHACOMP revisited

Murphy, H. J.; Sims, Chester T.; Beltran, A. M.

doi:10.1007/bf03378761

Cited by 13 publications

(5 citation statements)

References 6 publications

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“…A prudent selection for screening the types and amounts of alloying elements mandates that the TCP phases be minimised as much as possible while trying to obtain higher creep and rupture strengths. Predictive tools such as PHACOMP (Nv) [27] and PHACOMP (Md) [28] have traditionally been used to predict the occurrence of the TCP phases in preliminary screening of a large number of alloy compositions. The predictions should not be are totally relied upon and must be experimentally verified.…”

Section: Introductionmentioning

confidence: 99%

Development of strong, oxidation and corrosion resistant nickel-based superalloys: critical review of challenges, progress and prospects

Darolia¹

2018

International Materials Reviews

160

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A comprehensive review of alloying effects in nickel-based single-crystal superalloys for turbine blades and vanes operating in a very aggressive environment of stress, oxidation and corrosion is presented. Exceptionally strong single-crystal superalloys have been developed containing increasing amounts of rhenium and decreasing amounts of chromium resulting in reduced environmental resistance. Interactions in a superalloy containing up to 15 alloying elements are complex and poorly understood. The superalloys can form brittle topologically closedpacked (TCP) phases unless the alloying additions are carefully selected. Development of superalloys with a required balance of strength and environmental resistance has been very challenging. Aluminium, chromium and tantalum are essential alloying elements for strength and environmental protection. Aluminium beyond an upper limit can lead to incipient melting during heat treatment necessary for achieving an optimum size and distribution of the γ ′ phase. Rhenium and ruthenium additions contribute significantly to strength, while considerably degrading environmental resistance. Hafnium and yttrium singularly or in combinations improve oxidation and corrosion resistance. Progress in modelling based on thermodynamics, kinetics and regression analysis of prior data to simultaneously predict strength and environmental resistance has been limited since the strengthening and environmental degradation are distinctly separate mechanisms. The paper presents a critical review of alloying studies and provides an insight into future developments.

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Section: Introductionmentioning

confidence: 99%

Development of strong, oxidation and corrosion resistant nickel-based superalloys: critical review of challenges, progress and prospects

Darolia¹

2018

International Materials Reviews

160

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“…There are many methods to predict the precipitation tendency, such as PHACOMP and d-electrons alloy design theory etc. [12][13][14] Unfortunately, these methods are not accuracy to some alloys, because the precipitation behavior of the phase is not clear. This paper is therefore aimed at understanding it.…”

Section: Introductionmentioning

confidence: 99%

μ Phase in a Nickel Base Directionally Solidified Alloy

Zhao

Lou

et al. 2005

Mater. Trans.

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Scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD) were employed to study the phase in a directionally solidified experimental nickel base alloy. It was observed that the phase distribute at interdendritic area and precipitate mainly from the 0 phase in this experimental alloy. Orientation relationship between the 0 and the phase was found as ð111Þ 0 k ð0001Þ and h " 1 110i 0 k h11 " 2 20i . Detrimental effect of the phase on oxidation resistance of the alloys was also found.

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“…Methods to predict the precipitation tendency of TCP phases were desired to being applied to develop high performance alloys more efficiently. In response to such a great demand, several methods have been provided such as PHACOMP [1] and its revisited [2], Monte Carlo Simulation [3], Equilibrated alloying method [4], d-electrons alloy design theory [5], thermodynamics balance computation method [6], REN method [7]. These methods have been employed for the design of superalloys but have not proved wholly successful yet.…”

Section: Introductionmentioning

confidence: 99%