English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The commercial nickel base superalloy Alloy 625 can be strengthened by the precipitation of the metastable y” phase (DO,, structure) which is based on the stoichiometry Ni,Nb. Suitable ageing treatments in the temperature range of 600°C to 800°C can bring about copious y” precipitation in this alloy, the mode of precipitate nucleation depending on the aging temperature. At relatively low temperatures y” particles nucleate homogeneously in the austenite matrix. Ageing at temperatures above 800°C (and prolonged aging at somewhat lower temperatures) brings about the precipitation of the equilibrium intermetallic 6 phase (DO, structure; Ni,Nb stoichiometry). When ageing is carried out at temperatures close to but lower than the y” solvus temperature, the y” phase precipitates in a predominantly heterogeneous manner, dislocations and coherent twin boundaries being the preferred nucleation sites. The nucleation of all the three variants on dislocations has been observed. An attempt has been made to rationalise this observation by taking into consideration factors such as the elastic interaction between the strain fields of the dislocations and the y” precipitates and the stacking fault energy of the austenite matrix. The transition in the y” precipitation mode from homogeneous to heterogeneous with increasing aging temperature has been discussed in terms of the available time-temperature-precipitation (TTP) curves corresponding to the formation of intermetallic phases in this alloy. Superalloys 718,625,706 and Various Derivatives Edited by E.A. Loria The Minerals, Metals & Materials Society, 1994

Some Aspects of the Heterogeneous Precipitation of the Metastable &#947;" Phase in Alloy 625

Some Aspects of the Heterogeneous Precipitation of the Metastable γ" Phase in Alloy 625