Nanoindentation of Ni–Ti Thin Films

Tall, P. D.; Ndiaye, Saliou; Beye, Aboubaker Chédikh; Zong, Zhaowen; Soboyejo, W. O.; Lee, H.-J.; Ramirez, A. P.; Rajan, Krishna

doi:10.1080/10426910601062222

Cited by 56 publications

(19 citation statements)

References 18 publications

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“…These results suggest that the Young's modulus was not affected by the annealing temperatures, as the two curves are almost superimposed. For the NiTi-base films, the average elastic moduli reported in this study are close to those reported in other studies [39][40] for austenitic and martensitic Ni-Ti thin films. However, the error bars associated with the elastic moduli in figure 8 are almost superimposed, making it difficult to precisely distinguish the mechanisms involved during indentation.…”

Section: Mechanical Properties and Microstructuresupporting

confidence: 77%

Effects of Cu on the microstructural and mechanical properties of sputter deposited Ni-Ti thin films

Callisti

Tichelaar

Mellor

et al. 2013

Surface and Coatings Technology

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The microstructure of sputter deposited Ti-rich Ni-Ti thin films doped with Cu in the range 0-20.4 at.% and annealed for 1 h at 500 and 600°C has been investigated and correlated with the mechanical properties of the films measured by depth-sensing nanoindentation. X-ray diffraction analysis showed the microstructural evolution of Ni-Ti thin films when doped with Cu and annealed at different temperatures. Heat treatments promoted the nucleation and growth of Ti 2 Ni precipitates in Ti-rich Ni-Ti thin films, which affected the stability of austenitic and martensitic phases at ambient temperature. Doping with Cu caused the formation of Ti(Ni, Cu) 2 plate precipitates, which became more finely and densely dispersed in the grains with increasing Cu content. TEM analysis showed a columnar grain morphology extended through the whole films thickness, while with increasing Cu content a noticeable lateral grain refinement was induced by segregation of a (Ni, Cu)-rich phase to grain boundaries. The nano-hardness increased almost linearly with increasing Cu content owing to this grain refinement, though differences between samples annealed at different temperatures were found which could be related to the evolution of Ti(Ni, Cu) 2 plate precipitates with annealing temperature and Cu content. The Young's modulus exhibited a similar dependence on Cu content as nano-hardness, though no significant differences were observed with increasing annealing temperatures.

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Section: Mechanical Properties and Microstructuresupporting

confidence: 77%

Effects of Cu on the microstructural and mechanical properties of sputter deposited Ni-Ti thin films

Callisti

Tichelaar

Mellor

et al. 2013

Surface and Coatings Technology

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“…The profile was used to compute the hardness (Syed et al, 2013), Young's modulus (Tall et al, 2007), elastic recovery (Tall et al, 2007) and creep (Jian et al, 2013) from the empirical relationships in Eqs. (10) to (13).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Performance evaluation of cassava starch-zinc nanocomposite film for tomatoes packaging

Fadeyibi

Osunde

Egwim

et al. 2017

J Agricult Engineer

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Biodegradable nanocomposite films are novel materials for food packaging because of their potential to extend the shelf life of food. In this research, the performance of cassava starch-zincnanocomposite film was evaluated for tomatoes packaging. The films were developed by casting the solutions of 24 g cassava starch, 0-2% (w/w) zinc nanoparticles and 55% (w/w) glycerol in plastic mould of 12 mm depth. The permeability of the films, due to water and oxygen, was investigated at 27°C and 65% relative humidity while the mechanical properties were determined by nanoindentation technique. The average thickness of the dried nanocomposite films was found to be 17±0.13 µm. The performances of films for tomatoes packaging was evaluated in comparison with low density polyethylene (LDPE; 10 µm) at the temperature and period ranges of 10-27°C and 0-9 days, respectively. The quality and microbial attributes of the packaged tomatoes, including ascorbic acid, β-carotene and total coliform were analysed at an interval of 3 days. The results revealed that the water vapour permeability increased while the oxygen permeability decreased with the nanoparticles (P<0.05). The hardness, creep, elastic and plastic works, which determined the plasticity index of the film, decreased generally with the nanoparticles. The films containing 1 and 2% of the nanoparticles suppressed the growth of microorganisms and retained the quality of tomatoes than the LDPE at 27°C and day-9 of packaging (P<0.05). The results implied that the film could effectively be used for tomatoes packaging due to their lower oxygen permeability, hardness, elastic and plastic works.

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“…International collaborations among the United States and Africa, [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] J oint US-Africa Materials Institute (JUAMI) will be held December 10-21, 2018, in Kampala, Uganda. JUAMI features tutorials on cutting-edge energy materials topics, hands-on experiments and learning activities, and research seminars.…”

Section: In Summarymentioning

confidence: 99%

Strengthening diversity and cooperation through international collaborations: A focus on Africa, South America, and the Caribbean

Soboyejo

Madsen

2018

MRS Bull.

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Africa is the second largest continent in terms of size and population.1,2 With approximately 1.256 billion people (about 15% of the world’s population) and a land area of 30.3 million square kilometers (including adjacent islands), it occupies about 20.4% of the earth’s total land area.1 A significant fraction of the people in the Caribbean* and South America are of African descent, and there are many historical and cultural links among the people of these regions.3 South America has 422.5 million people, and the Caribbean has about 39.12 million people;1 hence, the total population of all three areas represents about 20% of the world’s population.1,2 Similarities in climate also mean that common approaches can be explored for establishing sustainable building materials, and the range of development indices offer unique opportunities for collaborations in research and education that can facilitate human development.4

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Nanoindentation of Ni–Ti Thin Films

Cited by 56 publications

References 18 publications

Effects of Cu on the microstructural and mechanical properties of sputter deposited Ni-Ti thin films

Effects of Cu on the microstructural and mechanical properties of sputter deposited Ni-Ti thin films

Performance evaluation of cassava starch-zinc nanocomposite film for tomatoes packaging

Strengthening diversity and cooperation through international collaborations: A focus on Africa, South America, and the Caribbean

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