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Conference Paper: Effects of boron doping on the grain growth behaviour of γ/γ nickel-aluminium alloy

TitleEffects of boron doping on the grain growth behaviour of γ/γ nickel-aluminium alloy
Authors
KeywordsPhysics engineering chemistry
Issue Date2000
PublisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/epubs/proceedings/spring2004/index.html
Citation
Materials Research Society Symposium: Nucleation and growth processes in materials, Boston, MA., 29 November-1 December 1999, In Materials Research Society Symposium Proceedings, 1999, v. 580, p. 189-194 How to Cite?
AbstractEffects of 0.5 at. 9c boron doping on Nigs Al y/f superalloys were investigated for the first !ime. yielding a number of observations not previously observed in the literature. First, the grant growth kinetics of both the doped and undoped alloys were found to disobey the simple Nielsen law d = Of. but instead follow an equation of the type d = C ln(r) + C0. The constants C and Co were found to be respectively 10.2 and 23.2 for the boron-free alloy, and 6.2 and 14.2 for ire boron-doped alloy, i.e., the grain growth rate was retarded significantly upon boron doping. Such a retarding effect is thought to be due to the formation of a boron-nickel cosegregated zone observed at the grain boundaries of the doped alloy: the width of the zone, in juni's, is two to three orders of magnitude larger than the boron induced disordered layer found in nickel rich Ni3Al. compounds doped with boron. Other associated effects of the cosegregated zone include a -harp increase in toughness, much better slip transmission across grains and reduced workhardening rates. Another intriguing point is that the Y precipitates were found to segregate to the grain boundaries in the boron-free alloy after cold rolling, but no such segregation of y precipitates, has been observed in the boron-doped alloy. The different deformation microstructures and the retarded grain growth rates upon boron doping will be discussed.
Persistent Identifierhttp://hdl.handle.net/10722/46659
ISSN
References

 

DC FieldValueLanguage
dc.contributor.authorChiu, YLen_HK
dc.contributor.authorNgan, AHWen_HK
dc.date.accessioned2007-10-30T06:55:18Z-
dc.date.available2007-10-30T06:55:18Z-
dc.date.issued2000en_HK
dc.identifier.citationMaterials Research Society Symposium: Nucleation and growth processes in materials, Boston, MA., 29 November-1 December 1999, In Materials Research Society Symposium Proceedings, 1999, v. 580, p. 189-194en_HK
dc.identifier.issn0272-9172en_HK
dc.identifier.urihttp://hdl.handle.net/10722/46659-
dc.description.abstractEffects of 0.5 at. 9c boron doping on Nigs Al y/f superalloys were investigated for the first !ime. yielding a number of observations not previously observed in the literature. First, the grant growth kinetics of both the doped and undoped alloys were found to disobey the simple Nielsen law d = Of. but instead follow an equation of the type d = C ln(r) + C0. The constants C and Co were found to be respectively 10.2 and 23.2 for the boron-free alloy, and 6.2 and 14.2 for ire boron-doped alloy, i.e., the grain growth rate was retarded significantly upon boron doping. Such a retarding effect is thought to be due to the formation of a boron-nickel cosegregated zone observed at the grain boundaries of the doped alloy: the width of the zone, in juni's, is two to three orders of magnitude larger than the boron induced disordered layer found in nickel rich Ni3Al. compounds doped with boron. Other associated effects of the cosegregated zone include a -harp increase in toughness, much better slip transmission across grains and reduced workhardening rates. Another intriguing point is that the Y precipitates were found to segregate to the grain boundaries in the boron-free alloy after cold rolling, but no such segregation of y precipitates, has been observed in the boron-doped alloy. The different deformation microstructures and the retarded grain growth rates upon boron doping will be discussed.en_HK
dc.languageengen_HK
dc.publisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/epubs/proceedings/spring2004/index.htmlen_HK
dc.relation.ispartofMaterials Research Society Symposium Proceedings-
dc.rightsMaterials Research Society Symposium Proceedings. Copyright © Materials Research Society.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPhysics engineering chemistryen_HK
dc.titleEffects of boron doping on the grain growth behaviour of γ/γ nickel-aluminium alloyen_HK
dc.typeConference_Paperen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0272-9172&volume=580&spage=189&epage=194&date=2000&atitle=Effects+of+Boron+Doping+on+the+Grain+Growth+Behaviour+of+g/g%27+Nickel-Aluminium+Alloyen_HK
dc.identifier.emailNgan, AHW: hwngan@hkucc.hku.hk-
dc.identifier.authorityNgan, AHW=rp00225-
dc.description.naturepublished_or_final_versionen_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0034539877-
dc.identifier.hkuros58751-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034539877&selection=ref&src=s&origin=recordpage-
dc.identifier.volume580-
dc.identifier.spage189-
dc.identifier.epage194-
dc.publisher.placeUnited States-
dc.identifier.scopusauthoridChiu, YL=7202775086-
dc.identifier.scopusauthoridNgan, AHW=7006827202-
dc.customcontrol.immutablesml 151120 - merged-

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