High-resolution transmission electron microscope (HRTEM) study of the transformation interface and substructure in NiTiHf40 melt–spun ribbons

Liu, M.; Zhang, X.M; Li, Y.Y; Chen, J.Z; Ming-jing, TU

doi:10.1016/s0925-8388(01)01762-5

Cited by 10 publications

(2 citation statements)

References 9 publications

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“…31 It is possible that the small variant pair stacking faults (arrowed in Figure 6) may form by the shearing effect of the nearby twin plane variant pairs. 32 It should be noted that, close to the {0001} α plane, a large amount of dislocations were found at lower magnification of HRTEM (Figure 7) offering another evidence of a large strain field in the post-THP annealed condition. It is obvious that the present microstructure evolution must be due to the continuous phase transformations through the hydrogenation/ dehydrogenation process, i.e.…”

Section: Resultsmentioning

confidence: 85%

The Effect of Thermal Hydrogenation Processing on the Oxide Layer Formation of Ti-6Al-4 V Alloy

Tsai

Wang

2013

J. Electrochem. Soc.

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The correlation of corrosion resistance and the related oxide layer structure on Ti-6Al-4 V alloy following a thermal hydrogenation processing (THP) plus common industrial heat treatment was investigated in this study. It appears that better corrosion resistance can be achieved by applying a post-THP annealing treatment associated with a controlled oxidation reaction which can almost seal the oxygen diffusion paths leading to the formation of a much thinner (0.56 μm), but denser oxide layer than has been indicated in the literature. The effect of the THP treatment on the possible mechanism for this produced oxide layer formation is discussed. The microstructure characterization of the substrate is also analyzed.Ti-6Al-4 V alloy is the most popular and widely used titanium alloy. Its major applications are in aerospace, chemical, automotive, marine, and biomedical industries due to the superior combination of mechanical properties with low density and good corrosion resistance. 1 Thermal hydrogenation processing (THP) is a recently developed process in which the hydrogen is used as a temporary alloying element. The hydrogen is added to the titanium alloy by holding the alloy at a relatively high temperature in a hydrogen environment, and then removing the absorbed hydrogen in the matrix using a controlled vacuum anneal. This attractive and powerful metallurgy technique can improve the production, processing, microstructure, and properties of titanium alloys. The correlation between the THP treatments and related properties is detailed elsewhere and reviewed by Froes et al. [2][3][4][5] Interestingly, studies have reported that the THP treatment can lead to grain refinement within the α matrix of Ti-6Al-4 V alloy and improve its mechanical properties. 6-9 However, according to some investigations of the microstructural effect on the corrosion behavior of Ti-6Al-4 V alloy, 10-13 α/β interfaces act as the preferential dissolution locations and increase the corrosion rate. 14 Therefore, the refined grains are an expected disadvantageous for corrosion resistance as a higher volume fraction of grain boundaries (α/β interfaces) is created. 15 That is the reason why the employment of the THP treatment against corrosion resistance is still ignored although recently the Ti-6Al-4 V alloy has been studied after the THP treatment under an oxide layer polished condition. 15 It is commonly understood that improvement in corrosion resistance of Ti based alloys can be achieved by employing a surface oxidation treatment such as plasma oxidation, 16 ion implantation, 17 anodizing, 18 and thermal oxidation, 19-22 among which the thermal oxidation technique generally provides the simplest and most cost-effective method to deliberately generate a barrier oxide layer with a greater thickness and corrosion resistance. 23 However, it should be noted that the increased thickness of the oxide layer may cause a porous structure and decreased adherence to the substrate, leading to a reduced corrosion resistance and even premature failure once...

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Section: Resultsmentioning

confidence: 85%

The Effect of Thermal Hydrogenation Processing on the Oxide Layer Formation of Ti-6Al-4 V Alloy

Tsai

Wang

2013

J. Electrochem. Soc.

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“…With the ribbons of NiTi-Hf 40 alloys, it was shown that such boundaries are of high energy and have non-equilibrium configuration [66]. Some parts of these boundaries are not direct, have irregular configuration, other ones show up as zigzag lines.…”

Section: Nucleation and Martensitic Transformation In Small Dimensionmentioning

confidence: 99%

Nucleation and Martensitic Transformation in Subjects of Small Dimensions

Lobodyuk

2014

Usp. Fiz. Met.

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The existing models and schemes of the martensitic phase nucleation are considered in the review. Theoretical and experimental works devoted to the nucleation of the martensitic crystals in different metals are discussed and analysed. The parameters and processes of the martensitic transformation in such subjects of small dimensions as particles, porous materials, thin films, nanoparticles, and nanomaterials are also considered and discussed.В огляді розглядаються наявні моделі та схеми зародження мартенсит-них фаз, обговорюються теоретичні й експериментальні роботи, прис-вячені зародженню кристалів мартенситу в різних металах. Розгляда-ються й обговорюються параметри та процеси мартенситного перетво-рення у таких об'єктах малих розмірів як частинки, порошкові матері-яли, тонкі плівки, наночастинки та наноматеріяли.В обзоре рассматриваются существующие модели и схемы зарождения мартенситных фаз, обсуждаются теоретические и экспериментальные работы, посвящённые зарождению кристаллов мартенсита в различных металлах. Рассматриваются и обсуждаются параметры и процессы мар-тенситного превращения в таких объектах малых размеров как частицы, порошковые материалы, тонкие плёнки, наночастицы и наноматериалы.

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Microstructural Response During Isothermal and Isobaric Loading of a Precipitation-Strengthened Ni-29.7Ti-20Hf High-Temperature Shape Memory Alloy

Benafan

Noebe

Padula

et al. 2012

Metall Mater Trans A

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High-resolution transmission electron microscope (HRTEM) study of the transformation interface and substructure in NiTiHf40 melt–spun ribbons

Cited by 10 publications

References 9 publications

The Effect of Thermal Hydrogenation Processing on the Oxide Layer Formation of Ti-6Al-4 V Alloy

The Effect of Thermal Hydrogenation Processing on the Oxide Layer Formation of Ti-6Al-4 V Alloy

Nucleation and Martensitic Transformation in Subjects of Small Dimensions

Microstructural Response During Isothermal and Isobaric Loading of a Precipitation-Strengthened Ni-29.7Ti-20Hf High-Temperature Shape Memory Alloy

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