Abstract
The addition of Cu to near equiatomic NiTi shape memory alloys (SMAs) can provide some modifications of their shape memory properties by affecting their transformation behavior. The same effect was obtained in the case of Ni3Ti2 and Ni4Ti3 precipitates presence in the microstructure of NiTi. Also the substitution of Cu to NiTi alloys increases the hardness of the materials. This paper presents the microstructural and mechanical investigations of NiTi and NiTiCu alloys obtained by spark plasma sintering (SPS) process that represents a great potential for researchers as a new process for the fabrication of intermetallic compounds.
Highlights
Development of NiTi and NiTiCu alloys by different methods was studied intensively over the last years
An examination of the X-ray diffraction patterns reveals at room temperature, with the peak position corresponding to the {110}B2 2θ coordinate
In some X-ray diffraction spectra were searched some oxides, especially titanium ones. As it can be seen both from energy dispersive X-ray (EDX) analysis and diffraction spectrum were not identified such compounds. These oxides could occur in NiTi and NiTiCu materials during the operations for samples obtaining such as mechanical alloying or preparing samples for introduction into the spark plasma sintering (SPS)
Summary
Development of NiTi and NiTiCu alloys by different methods was studied intensively over the last years. NiTi alloys with net final shape can be produced by non-conventional powder metallurgy (PM) methods such as self-propagating high temperature synthesis (SHS), hot isostatic pressing (HIP) and spark plasma sintering (SPS) [3,4,5]. These processes can avoid the problems associated with casting, like segregation or extensive grain growth and have the added advantages of precise control of composition and easy realization of complex part shapes [5]. This has been acknowledged to reduce significantly the synthesis and densification temperatures limiting the grain growth [6]
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