Effect of sintering temperatures on microstructural changes and phase transformation of nearly equiatomic microporous NiTi Alloy produced by metal injection moulding / Mashitah Maso’od ... [et al.]

Maso’od, Mashitah and Ismail, Muhammad Hussain and Razali, Rosliza and Subuki, Istiqamah (2018) Effect of sintering temperatures on microstructural changes and phase transformation of nearly equiatomic microporous NiTi Alloy produced by metal injection moulding / Mashitah Maso’od ... [et al.]. Journal of Mechanical Engineering (JMechE), SI 5 (6). pp. 115-126. ISSN 18235514

Abstract

In this present work, NiTi alloy were produced by metal injection moulding using elemental powders of Ni and Ti. The binder system comprised of palm stearin (PS). Two compositions of NiTi alloy were investigated; 50 at.% Ni, and 50.8 at.% Ni. Injection moulding was carried at 130°C, followed by solvent extraction using heptane as the solution. In a high vacuum furnace, the samples were thermally debound at 500oC and subsequently sintered at three different temperatures; 1050, 1100 and 1150 °C. All sintered samples were charateried by XRD and SEM for phase and microstructural analysis, respectively. Reversible phase transformation temperatures (PTTs) of austenite to martensite was determined by DSC analysis. The results showed that B2 (Austenite) and B19’ were the main phases identified while minor phases consist of minimal fractions of Ti-rich phases (NiTi2/Ni2Ti4Ox) and Ni- rich phases (Ni3Ti and Ni4Ti3). As composition of Ni content increased, the reversible martensite to austenite PTTs became wider while enthalpy for phase transition decreased. The FESEM microstuctural analysis defined the formation different phases of atomic mass from dissimilar grey scale contrast. Brightest region assumed to be Ni4Ti3 formation and vice versa indicated Ti-rich phases (NiTi2/Ni2Ti4Ox)

Metadata

Item Type: Article
Creators:
Creators
Email / ID Num.
Maso’od, Mashitah
UNSPECIFIED
Ismail, Muhammad Hussain
UNSPECIFIED
Razali, Rosliza
UNSPECIFIED
Subuki, Istiqamah
UNSPECIFIED
Subjects: T Technology > TA Engineering. Civil engineering > Materials of engineering and construction > Metals
T Technology > TJ Mechanical engineering and machinery
Divisions: Universiti Teknologi MARA, Shah Alam > Faculty of Mechanical Engineering
Journal or Publication Title: Journal of Mechanical Engineering (JMechE)
UiTM Journal Collections: UiTM Journal > Journal of Mechanical Engineering (JMechE)
ISSN: 18235514
Volume: SI 5
Number: 6
Page Range: pp. 115-126
Keywords: NiTi Alloy, Metal Injection Moulding (MIM), sintering, phase transformation
Date: 2018
URI: https://ir.uitm.edu.my/id/eprint/40957
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