2020
DOI: 10.3390/ma13092104
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Additively Manufactured NiTi and NiTiHf Alloys: Estimating Service Life in High-Temperature Oxidation

Abstract: In this study, the effect of the addition of Hf on the oxidation behavior of NiTi alloy, which was processed using additive manufacturing and casting, is studied. Thermogravimetric analyses (TGA) were performed at the temperature of 500, 800, and 900 °C to assess the isothermal and dynamic oxidation behavior of the Ni50.4Ti29.6Hf20 at.% alloys for 75 h in dry air. After oxidation, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy were used to analyze the oxide scale form… Show more

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Cited by 23 publications
(3 citation statements)
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“…A common technology in additive manufacturing (AM) for processing NiTi powder particles is selective laser melting (SLM) [ 5 , 6 , 7 ], which involves higher temperatures than those needed for NiTi melting (1310 °C). The high temperatures produce a melt pool that is very susceptible to contamination by impurities, and tends to form undesired phases during rapid and uncontrolled cooling.…”
Section: Introductionmentioning
confidence: 99%
“…A common technology in additive manufacturing (AM) for processing NiTi powder particles is selective laser melting (SLM) [ 5 , 6 , 7 ], which involves higher temperatures than those needed for NiTi melting (1310 °C). The high temperatures produce a melt pool that is very susceptible to contamination by impurities, and tends to form undesired phases during rapid and uncontrolled cooling.…”
Section: Introductionmentioning
confidence: 99%
“…With increasing oxygen level, a higher chance of oxidation and lower TTs are expected, assuming that the process parameters are kept constant. 96,99 The presence of dislocations and thermally induced residual stress are the other factors contributing to altering the TTs of as-fabricated NiTi. In the LPBF technique, due to localized high heating/cooling rates, the as-built parts experience residual stress.…”
Section: Phase Transformation Temperaturesmentioning
confidence: 99%
“…Moreover, the geometry of the produced parts is relatively simple, mainly comprising wire, rod, and thinplate shapes, due to the high reactivity of the Ti element and the poor machinability of NiTi alloys [92,93]. For example, when the alloys are highly oxidized at high temperatures, they become brittle and prone to cracking [94]. On the other hand, in cold working conditions, work hardening and material deformation can lead to serious tool wear [95,96].…”
mentioning
confidence: 99%