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Article: Pore formation mechanism and characterization of porous NiTi shape memory alloys synthesized by capsule-free hot isostatic pressing

TitlePore formation mechanism and characterization of porous NiTi shape memory alloys synthesized by capsule-free hot isostatic pressing
Authors
KeywordsCreep expansion
Hot isostatic pressing
Porous NiTi
Shape memory alloy
Sintering
Issue Date2007
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamat
Citation
Acta Materialia, 2007, v. 55 n. 10, p. 3437-3451 How to Cite?
AbstractPorous NiTi alloys with different porosities were fabricated by capsule-free hot isostatic pressing (CF-HIP) with ammonium acid carbonate (NH4HCO3) as a space-holder. The microstructure and porosity of porous NiTi produced with different NH4HCO3 contents and sintering temperatures were determined. Two different creep expansion models are used to explain the pore expansion mechanism during the sintering process, which involves slow and continuous reduction of the argon pressure at high temperatures. When the NH4HCO3 content is 30 wt.% and the sintering temperature is 1050 °C, an ideal porous NiTi alloy with 48 vol.% porosity and circular pores (50-800 μm) is obtained. Compression tests indicate that the porous NiTi alloys with 21-48% porosity possess not only lower Young's moduli of 6-11 GPa (close to that of human bones) but also higher compression strength and excellent superelasticity. Cell cultures reveal that the porous NiTi prepared here has no apparent cytotoxicity. The porous materials are thus promising biomaterials in hard tissue replacements. © 2007 Acta Materialia Inc.
Persistent Identifierhttp://hdl.handle.net/10722/79708
ISSN
2015 Impact Factor: 5.058
2015 SCImago Journal Rankings: 3.683
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWu, Sen_HK
dc.contributor.authorChung, CYen_HK
dc.contributor.authorLiu, Xen_HK
dc.contributor.authorChu, PKen_HK
dc.contributor.authorHo, JPYen_HK
dc.contributor.authorChu, CLen_HK
dc.contributor.authorChan, YLen_HK
dc.contributor.authorYeung, KWKen_HK
dc.contributor.authorLu, WWen_HK
dc.contributor.authorCheung, KMCen_HK
dc.contributor.authorLuk, KDKen_HK
dc.date.accessioned2010-09-06T07:57:41Z-
dc.date.available2010-09-06T07:57:41Z-
dc.date.issued2007en_HK
dc.identifier.citationActa Materialia, 2007, v. 55 n. 10, p. 3437-3451en_HK
dc.identifier.issn1359-6454en_HK
dc.identifier.urihttp://hdl.handle.net/10722/79708-
dc.description.abstractPorous NiTi alloys with different porosities were fabricated by capsule-free hot isostatic pressing (CF-HIP) with ammonium acid carbonate (NH4HCO3) as a space-holder. The microstructure and porosity of porous NiTi produced with different NH4HCO3 contents and sintering temperatures were determined. Two different creep expansion models are used to explain the pore expansion mechanism during the sintering process, which involves slow and continuous reduction of the argon pressure at high temperatures. When the NH4HCO3 content is 30 wt.% and the sintering temperature is 1050 °C, an ideal porous NiTi alloy with 48 vol.% porosity and circular pores (50-800 μm) is obtained. Compression tests indicate that the porous NiTi alloys with 21-48% porosity possess not only lower Young's moduli of 6-11 GPa (close to that of human bones) but also higher compression strength and excellent superelasticity. Cell cultures reveal that the porous NiTi prepared here has no apparent cytotoxicity. The porous materials are thus promising biomaterials in hard tissue replacements. © 2007 Acta Materialia Inc.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamaten_HK
dc.relation.ispartofActa Materialiaen_HK
dc.subjectCreep expansionen_HK
dc.subjectHot isostatic pressingen_HK
dc.subjectPorous NiTien_HK
dc.subjectShape memory alloyen_HK
dc.subjectSinteringen_HK
dc.titlePore formation mechanism and characterization of porous NiTi shape memory alloys synthesized by capsule-free hot isostatic pressingen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1359-6454&volume=55&issue=10&spage=3437&epage=51&date=2007&atitle=Pore+formation+mechanism+and+characterization+of+porous+NiTi+shape+memory+alloys+synthesized+by+capsule-free+hot+isostatic+pressingen_HK
dc.identifier.emailYeung, KWK:wkkyeung@hkucc.hku.hken_HK
dc.identifier.emailLu, WW:wwlu@hku.hken_HK
dc.identifier.emailCheung, KMC:cheungmc@hku.hken_HK
dc.identifier.emailLuk, KDK:hcm21000@hku.hken_HK
dc.identifier.authorityYeung, KWK=rp00309en_HK
dc.identifier.authorityLu, WW=rp00411en_HK
dc.identifier.authorityCheung, KMC=rp00387en_HK
dc.identifier.authorityLuk, KDK=rp00333en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.actamat.2007.01.045en_HK
dc.identifier.scopuseid_2-s2.0-34247593816en_HK
dc.identifier.hkuros137240en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-34247593816&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume55en_HK
dc.identifier.issue10en_HK
dc.identifier.spage3437en_HK
dc.identifier.epage3451en_HK
dc.identifier.isiWOS:000246956600014-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridWu, S=15125218800en_HK
dc.identifier.scopusauthoridChung, CY=8100842800en_HK
dc.identifier.scopusauthoridLiu, X=8408205200en_HK
dc.identifier.scopusauthoridChu, PK=36040705700en_HK
dc.identifier.scopusauthoridHo, JPY=7402650045en_HK
dc.identifier.scopusauthoridChu, CL=7404345713en_HK
dc.identifier.scopusauthoridChan, YL=8250546500en_HK
dc.identifier.scopusauthoridYeung, KWK=13309584700en_HK
dc.identifier.scopusauthoridLu, WW=7404215221en_HK
dc.identifier.scopusauthoridCheung, KMC=7402406754en_HK
dc.identifier.scopusauthoridLuk, KDK=7201921573en_HK

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