Microstructural and Mechanical Properties of Porous 60NiTi Prepared by Conventional Press-and-sinter Method

Abstract

Abstract. An intermetallic nickel-titanium alloy, 60NiTi, comprised of approximately 60 wt.% Ni and 40 wt.% Ti, contains a broad combination of physical and mechanical properties such as high hardness, low elastic modulus, resistance to aqueous corrosion and good biocompatibility. These unique combinations make this alloy an attractive candidate for medical components such as implants and prosthesis, where biocompatible materials with high hardness and low stiffness are typically used. The conventional press-and-sinter method which represents the least complex, most flexible and economic powder metallurgy method was used to produce porous 60NiTi parts suitable for biomedical applications. The effect of sintering holding time on the microstructure and mechanical properties is investigated. The structure of the as sintered parts is quite porous which is beneficial based on the medical point of view. The ultimate compressive strength of the samples is higher than that of the compact human bone and can, therefore, meet the strength demand of implants for general bone replacement applications.

The Effect of Powder Composition on the Microstructure and Corrosion Resistance of Laser Cladding 60NiTi Alloy Coatings on SS 316L

“…The Ni4Ti3 phase was also detected in the XRD pattern, but no Ni4Ti3 phase was found in the abovementioned microstructure observation. This is due to the small size of the Ni4Ti3 phase and its co-lattice with the NiTi phase [8], which is also the key factor for the existence of a high hardness of 60NiTi [33]. Moreover, Fe2Ti shown in XRD patterns was not found in the above-mentioned microstructure observation because of its lower content, which may be formed during the solidification stage based on the Fe-Ni-Ti ternary phase diagram [34].…”

“…Recently, the application of more advanced manufacturing and processing methods is emerging, and the preparation of 60NiTi alloy has been studied gradually. Casting [4] and powder metallurgy [8] are currently the main methods for 60NiTi alloy manufacturing. Nevertheless, 60NiTi is not a cost-effective material due to its high price and complicated preparation process.…”

Physical and Mechanical Behavior of NiTi Composite Fabricated by Newly Developed Uni-Axial Compaction Die

“…The highest hardness (453.8 HV 0.5 ) was identified for the NiTi 150 composite, as shown in Table 4. The highest hardness for this composite is obtained due to the increased compaction pressure, which provides a highly dense structure with strong bonding between powder particles 46 . Similarly, the hardness of composite is also influenced by the increase of Ni 3 Ti phase and decrease of NiTi 2 phase (Figure 7d).…”