Intermetallic formation and mechanical properties of Ni-Ti diffusion couples

Hu, Lifang; Xue, Yongzhi; Shi, Fang

doi:10.1016/j.matdes.2017.05.055

Cited by 67 publications

(23 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The titanium side is characterized mainly by a rough boundary of this phase and the Ti-rich phase (possibly Ti 2 Ni), extending between points 2 and 3. The latter shows elongated forms perpendicular to the sample surface towards residual Ti, similarly to those reported in [27,37]. It is worth noting that the better homogenized NiTi region is located at the Ni 3 Ti phase-in the initial nickel zone.…”

Section: Sem Images Presented Insupporting

confidence: 81%

“…In a closer look, some similarities of their shape to NiTi dendritic structure can be noted. Due to the NiTi phase growth, the Ni-rich phase content lowers [27].…”

Section: Sem Images Presented Inmentioning

confidence: 99%

“…Thus, at an elevated temperature of the sintering process, the diffusion within those phases would be very effective. Having in mind their beneficial thermodynamic parameters [27], this may explain why the Ti2Ni and Ni3Ti phases were initially formed, and finally, why the NiTi phase was created in such a synthesis process. Comparing SEM and EDS results of Ni/Ti/Ni and Ti/Ni/Ti configurations, it can be seen that the difference between them is dendritic structure for the latter and Ti-rich inclusions for the former.…”

Section: Sem Images Presented Inmentioning

confidence: 99%

“…After that, heat treatment is required to obtain desirable properties [21]. A hot pressing technique was shown to be very effective for obtaining nickel/titanium plates and multilayers of thin films for diffusion bonding purposes [22,23], powder metallurgy [24], and micro-foil/laminate preparation [21,[25][26][27][28]. The positive influence of the application of electrical current during synthesis on the NiTi phase creation was reported in [26,27,29].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Properties of NiTi Shape Memory Alloy Micro-Foils Obtained by Pulsed-Current Sintering of Ni/Ti Foils

Prendota

Goc

Strączek

et al. 2019

Metals

View full text Add to dashboard Cite

Successful one-step manufacturing of micro-foils of NiTi shape memory compound by pulsed-current sintering of nickel and titanium is reported. Sandwich-like starting configurations of Ni/Ti/Ni (ST1, ST4), Ti/Ni/Ti (ST3), and a simple Ni/Ti (ST2) one, were used. XRD and differential scanning calorimetry (DSC) measurements revealed multistep martensitic transformation, much more pronounced for ST1 than for ST2 and ST3. SEM/energy dispersive X-ray spectrometer (EDS) measurements showed the predominant NiTi phase in ST1, ST4, and other intermetallic compounds in addition to it, for ST2 and ST3. The temperature dependence of the electrical resistance for ST4 shows a peak corresponding to the R-phase and a high residual resistivity. The shape memory effect of 100% was obtained for ST1 and ST4, with the temperature range of its recovery dependent on the initial strain. The ST2 and ST3 materials revealed brittleness and a lack of plasticity due to the dominancy of the austenite phase and/or the intermetallic compound content.

show abstract

Section: Sem Images Presented Insupporting

confidence: 81%

“…In a closer look, some similarities of their shape to NiTi dendritic structure can be noted. Due to the NiTi phase growth, the Ni-rich phase content lowers [27].…”

Section: Sem Images Presented Inmentioning

confidence: 99%

Section: Sem Images Presented Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Properties of NiTi Shape Memory Alloy Micro-Foils Obtained by Pulsed-Current Sintering of Ni/Ti Foils

Prendota

Goc

Strączek

et al. 2019

Metals

View full text Add to dashboard Cite

show abstract

“…These energies are not directly accessible experimentally. Thorough studies have been performed at the level of first-principles calculations on selected solid-solid interfaces, focusing on various aspects such as the film thickness [4], orientation [7], magnetoresistance [11], magnetic anisotropy [12] ferromagnetic moments [13], as well as electronic [14][15][16][17], mechanical [18][19][20][21], and thermodynamic [22][23][24][25][26] properties. Notwithstanding Email address: linda.zotti@uam.es (Linda A. Zotti 1,2 ) the detailed nature of these analyses, they were quite often mostly focused on a very few materials.…”

Section: Introductionmentioning

confidence: 99%

A simple descriptor for energetics at fcc-bcc metal interfaces

2018

View full text Add to dashboard Cite

We have developed a new and user-friendly interface energy calculation method that avoids problems deriving from numerical differences between bulk and slab calculations, such as the number of k points along the direction perpendicular to the interface. We have applied this to 36 bcc-fcc metal interfaces in the (100) orientation and found a clear dependence of the interface energy on the difference between the work functions of the two metals, on the one hand, and the total number of d electrons on the other. Greater mechanical deformations were observed in fcc crystals than in their bcc counterparts. For each bcc metal, the interface energy was found to follow the position of its d band, whereas the same was not observed for fcc.Keywords: Metallic interfaces, interface energy, work of separation, ab initio simulations, surface energy c 2018. This is made available under the CC-BY-NC-ND 4.0 license, http://creativecommons.org/licenses/by-nc-nd/4.0/ .

show abstract

Failure Process Observation and Failure Mechanism of Ni‐Coated TC4 Alloy by Gradually Changed Curvature Bending Method

et al. 2021

View full text Add to dashboard Cite

To observe the failure process of coating/substrate materials, a gradually changed curvature bending (GCCB) method is proposed, and the relevant equipment is developed. Before GCCB experiment, Ni-coated Ti6Al4V (TC4) samples were prepared. The effect of vacuum heat treatment on the microstructure at Ti/Ni interface is discussed. With the increase in heat treatment time, intermetallic compounds of TiNi 3 , TiNi, and Ti 2 Ni start to form. Kirkendall void forms in Ni coating at first, and then the pore number decreases due to interdiffusion. Based on the interdiffusion of Ni into TC4 substrate, β-Ti phase forms at the surface region. The whole failure process of Ni-coated TC4 sample by GCCB experiment is observed and analyzed. With the increase in bending curvature, the fracture order of each layer is TiNi 3 > Ti 2 Ni > TiNi. With the increase in heat treatment time, the bonding property of the coating first increases and then decreases, and the failure mode also changes. The failure occurs at TiNi 3 layer when the heat treatment time is 60 min. When the heat treatment time is 120 min, the bonding property of the coating is the highest and surface vertical crack occurs. When treated 180 min, failure occurs at Ti 2 Ni layer.

show abstract

Intermetallic formation and mechanical properties of Ni-Ti diffusion couples

Cited by 67 publications

References 37 publications

Properties of NiTi Shape Memory Alloy Micro-Foils Obtained by Pulsed-Current Sintering of Ni/Ti Foils

Properties of NiTi Shape Memory Alloy Micro-Foils Obtained by Pulsed-Current Sintering of Ni/Ti Foils

A simple descriptor for energetics at fcc-bcc metal interfaces

Failure Process Observation and Failure Mechanism of Ni‐Coated TC4 Alloy by Gradually Changed Curvature Bending Method

Contact Info

Product

Resources

About