Study of hardness and wear behaviour of NiTi shape memory alloys

Arciniegas, Milena P.; Casals, Joan; Manero, J. M.; Peña, J.; Gil, F.J.

doi:10.1016/j.jallcom.2007.05.069

Cited by 77 publications

(37 citation statements)

References 30 publications

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“…The SADP of this twinned phase consists of the superposition of two different diffraction patterns (see inset of Fig. 7c) B2 austenite (bright spots) and B19' martensite (darker spots indexed in red), thus confirming that the striations correspond to twins (austenite transforms into martensite through twinning) [38]. The composition of this phase is Cu 48.8 Zr 49.7 Al 1.6 , i.e., Zr/Cu1, much poorer in Al than the nominal composition and therefore confirms our previous statement that it corresponds to CuZr martensite (i.e., austenite transforms into martensite through twinning) [16].…”

Section: Accepted Manuscriptmentioning

confidence: 65%

Strategy for preventing excessive wear rate at high loads in bulk metallic glass composites

et al. 2017

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The effect of nickel additions to tune the wear performance of Cu 45.5 Zr 51 Al 3.5 at. % alloy has been studied to present a new strategy for preventing excessive wear rate at high loads in metallic glass composites. This strategy consists on proper selection of a doping element in controlled concentrations with the ability to decrease the glass transition temperature (T g ) of the alloy so that the friction temperature during sliding is close to the T g . This enables the formation of crystalline phases and their subsequent oxidation (lubricating layer) on the contact surface during sliding thus enhancing the wear resistance. Proper doping can also contribute towards the wear resistance when the content of the doping element promotes the martensitic transformation. The results show that the main wear mechanism for the three studied alloys (Cu 45.5 Zr 51 Al 3.5 , Cu 44.5 Zr 51 Al 3.5 Ni 1 and Cu 43.5 Zr 51 Al 3.5 Ni 2 at. %) is governed by delamination and the mass loss increases with increasing load from 1 to 10 N. However, for the maximum load of 15 N, the calculated friction temperature is close to T g for the Ni-containing alloys and partial crystallization and oxidation take place resulting in a mass loss decrease from about 2.6 mg (at 10 N) to about 2.1 mg (at 15 N).

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Section: Accepted Manuscriptmentioning

confidence: 65%

Strategy for preventing excessive wear rate at high loads in bulk metallic glass composites

et al. 2017

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“…Titanium oxide (TiO 2 ) has higher hardness of 11.08GPa which correspond to 1130HV compared to 186HV for NiTi [7,8]. Thus the hardness of the oxidized samples increased as the thickness of oxide layer increase with increasing heat treatment temperature.…”

Section: Vickers Hardnessmentioning

confidence: 99%

“…The surface oxidation was reported to increase the surface hardness of pure titanium [7]. The formation of TiO 2 layer may also improve the surface hardness of NiTi alloy as the hardness of TiO 2 is higher compared to NiTi alloy [7,8]. However, the changes in surface hardness of NiTi alloy after oxidation were less studied.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface oxidation on shape memory behaviour of NiTi alloy

Mahmud¹,

Ng²,

Razali³

2016

AIP Conference Proceedings

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Abstract. Heat treatment of Nickel Titanium (NiTi) shape memory alloy at high temperature will result in formation of titanium oxide (TiO 2 ) layer at the surface. TiO 2 is a ceramic with higher value of hardness and does not exhibit martensitic phase transformation, thus affects the shape memory behaviour of the NiTi core. This work studies the effect of formation of TiO 2 layer on the surface towards the shape memory behaviour of near-equiatomic NiTi alloy. The NiTi plate with composition of Ti-50.2at%Ni was subjected to heat treatment at temperature of 723K to 1173K for 30 and 60 minutes. The formation of TiO 2 layer was observed using scanning electron microscope. The change in surface hardness of heat treated NiTi plate was characterized by Vickers hardness test and nano-indentation. The results showed that surface hardness increased as the thickness of the TiO 2 layer increased. Subsequently, the austenite finish and martensite start temperatures were also shifted to higher temperature to correspond to the effect of TiO 2 presence at the surface.

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“…Ninomi 4 reported that V and Al free alloys were developed. 3 Arciniegas et al 17 studied that five TiNi alloys were prepared with compositions varying from 49 at.% to 51 at.% Ni, austenized at 800°C for 10 min, quenched in water, and annealed at 500°C for 1 h before air cooling. On b-phase alloys, the wear behavior was influenced by the presence of semicoherent precipitates as well as its high capacity of transformation, and then, by decreasing the damage mechanisms while in martensite-phase alloys, it was conditioned by the reorientation and/ or retransformation of the existent plates.…”

Section: Introductionmentioning

confidence: 99%

“…18,19 The literature reviews have demonstrated that equiatomic TiNi alloy exhibits high mechanical and wear resistance. [1][2][3][4][8][9][10][15][16][17] Some attempts were made previously to develop TiNi-matrix composites. 5,6,9,12 However, a very limited study on the nanoscale powders was used for manufacturing TiNi alloys.…”

Section: Introductionmentioning

confidence: 99%

Effects of Al2O3 Nanopowders on the Wear Behavior of NiTi Shape Memory Alloys

Şahin

Öksüz

2013

JOM

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TiNi shape memory alloy and its composite using d-Al 2 O 3 nanosize particles were prepared by the powder metallurgy method, and some mechanical properties like hardness, wear, and corrosion behavior were investigated. The experimental results exhibited that the lower wear rate was obtained for the nano-Al 2 O 3 -reinforced Ti alloy composite due to increased hardness, but the wear rate increased considerably with increasing the load over 25 N for Ti alloy. However, the best corrosion resistance was obtained for the base alloy, which is very important for implant applications.

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Study of hardness and wear behaviour of NiTi shape memory alloys

Cited by 77 publications

References 30 publications

Strategy for preventing excessive wear rate at high loads in bulk metallic glass composites

Strategy for preventing excessive wear rate at high loads in bulk metallic glass composites

Effect of surface oxidation on shape memory behaviour of NiTi alloy

Effects of Al2O3 Nanopowders on the Wear Behavior of NiTi Shape Memory Alloys

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