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Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system

In this work, the effects of backbone polymer in the binder system mixed with pre-alloyed NiTi powder, on impurity contents, phase transformation temperatures and microstructures were investigated. A spherical gas-atomised pre-alloyed NiTi powder (50.3 at. %Ni) with a mean particle size of less than...

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Main Authors: Muhammad Hussain Ismail,, Bram, Martin, Barbosa, Ana Paula Cysne, Kohl, Manuel, Davies, Hywel A., Todd, Iain
Format: Article
Language:English
Published: Universiti Kebangsaan Malaysia 2013
Online Access:http://journalarticle.ukm.my/6688/1/12_Muhammad_Hussain_Ismail.pdf
http://journalarticle.ukm.my/6688/
http://www.ukm.my/jsm/
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spelling my-ukm.journal.66882016-12-14T06:41:55Z http://journalarticle.ukm.my/6688/ Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system Muhammad Hussain Ismail, Bram, Martin Barbosa, Ana Paula Cysne Kohl, Manuel Davies, Hywel A. Todd, Iain In this work, the effects of backbone polymer in the binder system mixed with pre-alloyed NiTi powder, on impurity contents, phase transformation temperatures and microstructures were investigated. A spherical gas-atomised pre-alloyed NiTi powder (50.3 at. %Ni) with a mean particle size of less than 22 μm and powder loading of 69.5 vol. % was used. The binder consisted of a water soluble binder system, mainly polyethylene glycol (PEG), with two different backbone binders, namely polyethylene 520 (PE 520) and poly-methyl- methacrylate (PMMA). The latter was used in the form of a powder and as an emulsion. Green parts were prepared by warm-press the feedstock into a cylindrical shape. The samples were then leached in warm water, thermally debound in Argon and finally, vacuum sintered at 1240°C for 10 h. The experimental results indicate that the oxygen content in the as-sintered condition increased to almost double than that of the powder state (from 0.08 to 0.14 - 0.16 wt. %) and the carbon increased by one third to half (from 0.06 to 0.08 - 0.09 wt. %). This consequently resulted in a shift of the phase transformation temperature to lower values and consequently broadened the reversible austenite to martensite transformation. The uptake of oxygen and carbon during the process led to the formation of the well-known Ti4Ni2Ox and TiC precipitate phases which were evident from grey-scale images of back-scattered SEM. Universiti Kebangsaan Malaysia 2013-12 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/6688/1/12_Muhammad_Hussain_Ismail.pdf Muhammad Hussain Ismail, and Bram, Martin and Barbosa, Ana Paula Cysne and Kohl, Manuel and Davies, Hywel A. and Todd, Iain (2013) Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system. Sains Malaysiana, 42 (12). pp. 1769-1773. ISSN 0126-6039 http://www.ukm.my/jsm/
institution Universiti Kebangsaan Malaysia
building Perpustakaan Tun Sri Lanang Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Kebangsaan Malaysia
content_source UKM Journal Article Repository
url_provider http://journalarticle.ukm.my/
language English
description In this work, the effects of backbone polymer in the binder system mixed with pre-alloyed NiTi powder, on impurity contents, phase transformation temperatures and microstructures were investigated. A spherical gas-atomised pre-alloyed NiTi powder (50.3 at. %Ni) with a mean particle size of less than 22 μm and powder loading of 69.5 vol. % was used. The binder consisted of a water soluble binder system, mainly polyethylene glycol (PEG), with two different backbone binders, namely polyethylene 520 (PE 520) and poly-methyl- methacrylate (PMMA). The latter was used in the form of a powder and as an emulsion. Green parts were prepared by warm-press the feedstock into a cylindrical shape. The samples were then leached in warm water, thermally debound in Argon and finally, vacuum sintered at 1240°C for 10 h. The experimental results indicate that the oxygen content in the as-sintered condition increased to almost double than that of the powder state (from 0.08 to 0.14 - 0.16 wt. %) and the carbon increased by one third to half (from 0.06 to 0.08 - 0.09 wt. %). This consequently resulted in a shift of the phase transformation temperature to lower values and consequently broadened the reversible austenite to martensite transformation. The uptake of oxygen and carbon during the process led to the formation of the well-known Ti4Ni2Ox and TiC precipitate phases which were evident from grey-scale images of back-scattered SEM.
format Article
author Muhammad Hussain Ismail,
Bram, Martin
Barbosa, Ana Paula Cysne
Kohl, Manuel
Davies, Hywel A.
Todd, Iain
spellingShingle Muhammad Hussain Ismail,
Bram, Martin
Barbosa, Ana Paula Cysne
Kohl, Manuel
Davies, Hywel A.
Todd, Iain
Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system
author_facet Muhammad Hussain Ismail,
Bram, Martin
Barbosa, Ana Paula Cysne
Kohl, Manuel
Davies, Hywel A.
Todd, Iain
author_sort Muhammad Hussain Ismail,
title Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system
title_short Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system
title_full Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system
title_fullStr Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system
title_full_unstemmed Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system
title_sort phase transformation temperatures (ppts) and microstructure of moulded niti alloy using a water soluble binder system
publisher Universiti Kebangsaan Malaysia
publishDate 2013
url http://journalarticle.ukm.my/6688/1/12_Muhammad_Hussain_Ismail.pdf
http://journalarticle.ukm.my/6688/
http://www.ukm.my/jsm/
_version_ 1643736857012338688
score 13.211869

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