Mechanical Properties Of Porous NiTi Shape Memory Alloy

Wong, Pei Wen (2022) Mechanical Properties Of Porous NiTi Shape Memory Alloy. Project Report. Universiti Sains Malaysia, Pusat Pengajian Kejuruteraan Mekanikal. (Submitted)

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Shape memory Alloy (SMA) is one type of alloy that is very unique for its ability on returning to initial shape. SMA can remember the shape or pattern after the alloy undergo plastic deformation. Even if the alloy experience the stimuli that made the alloy to change its shape, it will return back to the shape or pattern after the stimuli ends. These phenomenon is known as shape memory effect (SME). Many studies found that NiTi SMA shows a great utility in biomedical field and it can be used on implantation. However, there is a problem that the current material may have mismatch in elastic modulus between the human bone and metallic material which causes stress shielding to occur and leads to bone resorption. The solution for this problem to make porous structure inside the material to improve its strength. Hence, the effect of pore forming agent, CaH2 on the mechanical properties of porous NiTi SMA fabricated using powder metallurgy method with the addition of different weight percentage of CaH2. The samples then undergo characterization and compression testing to analyse the samples’ properties. Result show that the increasing of weight percentage of CaH2 increase the pore size in sample and also decrease the sample density while increase its porosity. Increasing in CaH2 will also affect the austenite and martensite transformation temperatures and enthalpy changes of reactions. The compressive stress and Young Modulus decreases as the CaH2 increases in samples. In the aspect of biomedical application, thcompressive stress and Young’s Modulus recorded in all samples can meet the demand for biomedical implantation as the samples satisfied within the range of the reference value of human bones like cancellous and cortical bone.

Item Type: Monograph (Project Report)
Subjects: T Technology
T Technology > TJ Mechanical engineering and machinery
Divisions: Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Mekanikal (School of Mechanical Engineering) > Monograph
Depositing User: Mr Engku Shahidil Engku Ab Rahman
Date Deposited: 03 Nov 2022 09:09
Last Modified: 03 Nov 2022 09:09

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