Characterization of Ni–Ti shape memory alloys prepared by powder metallurgy

Jabur, Adnan S.; Al-Haidary, J. T.; Al-Hasani, Emad S.

doi:10.1016/j.jallcom.2013.05.029

Cited by 33 publications

(12 citation statements)

References 12 publications

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“…The increase of hardness after addition of aluminium was expected due to the formation of more intermetallic phases as well. The increase of hardness after aluminium addition was described in [17,18]. It was caused by stabilization of the hard Ti2Ni phase and substitution strengthening of the NiTi phase.…”

Section: Resultsmentioning

confidence: 99%

PHASE FORMATION IN NiTiAl10 POWDER MIXTURE DURING HEATING TO 1100 °C

Salvetr

Školáková

Novák

et al. 2018

Acta Metall Slovaca

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In this paper the comparison of NiTiAl10 wt. % with the binary NiTi46 wt. % prepared by powder metallurgy was researched. The method of combustion synthesis was carried out under following conditions: sintering temperature of 800 °C and 1100 °C and heating rate approx. 300 °C.min-1. The addition of aluminium into NiTi46 wt. % powder mixture completely changed the temperature of combustion synthesis and phase evolution during sintering. The reactions into Ni-Ti-Al powder mixture started below the melting temperature of aluminium and the new phases were formed in microstructure. The process of reactive sintering was studied by differential thermal analysis using the heating rate of 30 °C.min-1 and 100 °C.min-1 using combination of induction furnace and optical pyrometer. The addition of aluminium influenced microstructure significantly and increased the hardness of samples.

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Section: Resultsmentioning

confidence: 99%

PHASE FORMATION IN NiTiAl10 POWDER MIXTURE DURING HEATING TO 1100 °C

Salvetr

Školáková

Novák

et al. 2018

Acta Metall Slovaca

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“…By comparison, prolonging aging time is a more effective to increase M s than raising annealing temperature for Ni-rich Ni-Ti SMAs, due to the former is easier to obtain the Nirich Ni 4 Ti 3 and Ni 4 (Tiþ Hf) 3 precipitates. In addition, the M s of NiTi-Al alloys prepared by powder metallurgy does not sharply decrease with increasing Al content from 0.1 to 0.5 wt.% [20], but role of Ni-rich Ni 3 Ti precipitates are ignored. So far, we do not really know effects and mechanisms of Ni-rich precipitates on phase transformation behavior.…”

Section: Introductionmentioning

confidence: 91%

Multiple effects of Ni-rich precipitates in Ni–Ti–Al thin films

Shi¹,

Cao²,

Wei³

et al. 2015

Materials Science and Engineering: A

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“…In the case of sintered parts, the inherent porous nature of the material provides a narrow tortuous electrolyte path that promotes corrosion propagation. Therefore, denser and less porous components are preferred while corrosion is the main concern [9]. (2) The densified sample can be fabricated at a lower temperature of 1150…”

Section: Microstructure Of the Formed Samplementioning

confidence: 99%

Fabrication of NiTi shape memory alloy by Micro-FAST

Huang

Qin

Zhao

et al. 2015

MATEC Web of Conferences

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Abstract.A NiTi shape memory alloy, known as nitinol, has been intensively studied for last five decades. The NiTi alloy with large size is commonly produced by vacuum sintering, thermal explosion mode of self-propagating high-temperature synthesis (TE-SHS) and spark plasma sintering (SPS). These methods are, however, rarely utilized for the forming of miniature and micro-sized components and have their own limits and disadvantages, such as long process chains and low efficiency with the processes. In the study reported in this paper, an innovation in rapid powder consolidation technology, called Micro-FAST (combining micro-forming and electric-current activated sintering techniques (FAST)) is introduced for the forming of micro-components in which the loose powders are loaded directly into the die, followed by electric-sintering. In the study, 4.0 mm × 4.0 mm miniature cylinders were formed with pre-alloyed NiTi powders. Sintered sample with relative density of 98.65% has been fabricated at a sintering temperature of 1150°C in a relatively short cycle time (119.5 s). Based on the results of SEM and XRD, it was found that the densified samples with Ni 3 Ti, NiTi and NiTi 2 phases were produced.

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Characterization of Ni–Ti shape memory alloys prepared by powder metallurgy

Cited by 33 publications

References 12 publications

PHASE FORMATION IN NiTiAl10 POWDER MIXTURE DURING HEATING TO 1100 °C

PHASE FORMATION IN NiTiAl10 POWDER MIXTURE DURING HEATING TO 1100 °C

Multiple effects of Ni-rich precipitates in Ni–Ti–Al thin films

Fabrication of NiTi shape memory alloy by Micro-FAST

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