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Conference Paper: Phase transformation behaviour of porous NiTi alloys fabricated by capsule-free hot isostatic pressing

TitlePhase transformation behaviour of porous NiTi alloys fabricated by capsule-free hot isostatic pressing
Authors
KeywordsShape Memory Alloy
Porous NiTi
Differential scanning calorimetry
Hot isostatic pressing
Issue Date2005
Citation
The 1st International Symposium on Functional Materials, Kuala Lumpur, Malaysia, 6-8 December 2005, p. 64-70 How to Cite?
AbstractDifferential scanning calorimetry (DSC) was used to characterize the phase transformation behaviour of porous Ni50Ti50 alloys fabricated by capsule-free hot isostatic pressing (CF-HIP) with different cold compaction pressures. Experimental results reveal that a multi-stage martensitic transformation (MST) exists in the sintered porous NiTi alloys on cooling while the reverse transformation upon heating is either a single or two-stage phase transformation. The DSC thermal analysis indicates that the cold compaction pressure has great effect on the subsequent transformation temperatures. Generally, the phase transformation temperatures of porous NiTi alloys with lower cold compaction pressure are higher than those compacted with higher pressure. With increase in the annealing time, the transformation temperatures increase quickly when the cold compaction pressure was 150MPa. On the other hand, the transformation temperatures change only slightly when the cold compaction pressure was varied from 300MPa to 400MPa. These phenomena can be attributed to the combined effect of larger plastic deformation with higher dislocations density produced by cold compaction and the precipitation of the second phase in the porous NiTi alloys.
Persistent Identifierhttp://hdl.handle.net/10722/103622

 

DC FieldValueLanguage
dc.contributor.authorWu, SLen_HK
dc.contributor.authorLiu, XMen_HK
dc.contributor.authorChu, PKen_HK
dc.contributor.authorChung, CYen_HK
dc.contributor.authorChu, SLen_HK
dc.contributor.authorYeung, KWKen_HK
dc.date.accessioned2010-09-25T21:20:00Z-
dc.date.available2010-09-25T21:20:00Z-
dc.date.issued2005en_HK
dc.identifier.citationThe 1st International Symposium on Functional Materials, Kuala Lumpur, Malaysia, 6-8 December 2005, p. 64-70-
dc.identifier.urihttp://hdl.handle.net/10722/103622-
dc.description.abstractDifferential scanning calorimetry (DSC) was used to characterize the phase transformation behaviour of porous Ni50Ti50 alloys fabricated by capsule-free hot isostatic pressing (CF-HIP) with different cold compaction pressures. Experimental results reveal that a multi-stage martensitic transformation (MST) exists in the sintered porous NiTi alloys on cooling while the reverse transformation upon heating is either a single or two-stage phase transformation. The DSC thermal analysis indicates that the cold compaction pressure has great effect on the subsequent transformation temperatures. Generally, the phase transformation temperatures of porous NiTi alloys with lower cold compaction pressure are higher than those compacted with higher pressure. With increase in the annealing time, the transformation temperatures increase quickly when the cold compaction pressure was 150MPa. On the other hand, the transformation temperatures change only slightly when the cold compaction pressure was varied from 300MPa to 400MPa. These phenomena can be attributed to the combined effect of larger plastic deformation with higher dislocations density produced by cold compaction and the precipitation of the second phase in the porous NiTi alloys.-
dc.languageengen_HK
dc.relation.ispartof1st International Symposium on Functional Materialsen_HK
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectShape Memory Alloy-
dc.subjectPorous NiTi-
dc.subjectDifferential scanning calorimetry-
dc.subjectHot isostatic pressing-
dc.titlePhase transformation behaviour of porous NiTi alloys fabricated by capsule-free hot isostatic pressingen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailYeung, KWK: wkkyeung@hkucc.hku.hken_HK
dc.identifier.authorityYeung, KWK=rp00309en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.hkuros113833en_HK

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