Vacuum induction melting of NiTi shape memory alloys in graphite crucible

Nayan, Nafarizal; Govind,; Saikrishna, C.N.; Ramaiah, K.V.; Bhaumik, SK; Nair, K. Suseelan; Mittal, Manoj

doi:10.1016/j.msea.2007.04.039

Cited by 76 publications

(24 citation statements)

References 9 publications

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“…The reason of increase of Al content is likely to be caused by a reaction of the melt with the graphite crucible leading to formation of a layer of titanium carbides or titanium and aluminium carbides on the crucible surface. Similar decrease of Ti was also observed during the melting of NiTi alloy in graphite crucibles, where the difference between nominal and measured content of Ti reached up to 4 % [29]. It should be noted that Lapin and Frkáňová [30] observed lower content of Al than the nominal composition in Ti-Al-Ta alloys prepared by plasma melting in water cooled copper heart due to Al evaporation during melting.…”

Section: Characterisation Of As-cast Alloyssupporting

confidence: 68%

Preparation of TiAl-based alloys by induction melting in graphite crucibles

Čegan¹,

Szurman²,

Kursa³

et al. 2016

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Three TiAl-based alloys with nominal composition Ti-47Al-8Nb, Ti-47Al-8Ta and Ti-47Al--8Ta-0.3Y (at.%) were prepared by induction melting in graphite crucibles and centrifugal casting into graphite moulds. Chemical composition, microstructure and mechanical properties of the as-cast alloys are characterised. The melting in the graphite crucible leads to an increase of carbon content from 460 to 1020 wtppm and formation of fine carbide particles predominantly in the γ(TiAl) phase. Beside fine carbides, the addition of 0.3 at.% of yttrium results in formation of fine Y2O3 and YAl2 particles. The oxygen content depends on the chemical composition and varies between 330 and 780 wtppm for Ta and Nb containing alloys, respectively. The as-cast alloys exhibit relatively high values of room-temperature compression yield strength up to 922 MPa, ultimate compression strength up to 1793 MPa and plastic deformation to fracture up to 24.3 %. The compression yield strength increases linearly with increasing Vickers microhardness of the as-cast alloys. From the point of view of chemical composition, microstructure and studied mechanical properties, induction melting in the graphite crucible and centrifugal casting into graphite mould can be considered as a suitable method of preparation of TiAl-based alloys.K e y w o r d s :

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Section: Characterisation Of As-cast Alloyssupporting

confidence: 68%

Preparation of TiAl-based alloys by induction melting in graphite crucibles

Čegan¹,

Szurman²,

Kursa³

et al. 2016

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“…Experience of the authors [12][13][14] with similar materials and their deformation behaviour led already in past to application of heating of extrusion matrix. The samples were moreover imbedded into steel "carriers" in order to reduce rapid heat removal and increase utilisation of experimental material thanks to less deformed ends of samples.…”

Section: Methodsmentioning

confidence: 99%

Investigation of influence of preparation and heat treatment on deformation behaviour of the alloy NiTi after ECAE

Kocich

Szurman

Kursa

et al. 2009

Materials Science and Engineering: A

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“…This content of carbon in TiNi is lower than that (0.07 mass%) in TiNi alloys prepared by vacuum induction melting in the graphite crucible. 39) Moreover, it is found from the contents of impurities that the cleanly molten metals were created by utilization of CCLM without the reaction between the molten metal and water-cooled copper crucible, although the affinity of Ti with oxygen, carbon and nitrogen was strong. Figure 8 shows the typical DSC curves of TiNi, TiNi-1Cr, TiNi-7.5Cu and TiNi-4.5Al alloys.…”

Section: Microstructures and Effects Of Cclmmentioning

confidence: 99%

Property-Control of TiNi System Intermetallics and Their Characteristics

et al. 2011

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The martensitic transformation temperature in addition to the tensile strength and oxidation resistance, were able to be estimated in the crystal structure map using both parameters of the bond order and d-orbital energy level of elements, for the design of TiNi shape memory compounds. The ternary TiNi-(Cr, Re, Fe, Cu, Al) intermetallics having the objective constructed phase, tensile strength, Ms-temperatures and oxidation resistance, were obtained successfully, by the adjustment of both parameters. It is found that the effectiveness of the d-electrons concept could be judged, for property-control of ternary TiNi intermetallics, as well as metallic materials.

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Vacuum induction melting of NiTi shape memory alloys in graphite crucible

Cited by 76 publications

References 9 publications

Preparation of TiAl-based alloys by induction melting in graphite crucibles

Preparation of TiAl-based alloys by induction melting in graphite crucibles

Investigation of influence of preparation and heat treatment on deformation behaviour of the alloy NiTi after ECAE

Property-Control of TiNi System Intermetallics and Their Characteristics

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