Fabrication and characterization of nanostructured immiscible Cu–Ta alloys processed by high-pressure torsion

Mousavi, Tayebeh; Dai, Jiaoyan; Bazarnik, Piotr; Pereira, Pedro Henrique R.; Huang, Yi; Lewandowska, M.; Langdon, Terence G.

doi:10.1016/j.jallcom.2020.155007

Cited by 22 publications

(8 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[37] Mousavi et al measured average Vickers microhardness of the annealed Ta (%200 HV). [38] Furthermore, Singh et al claimed that the microhardness of pure Nb was lower than that of pure Ta, which is in agreement with the result obtained in our study. [39] The diffusion layers with Nb and Ta interlayers give the hardness of 519 AE 99 HV 0.1 and 533 AE 46 HV 0.1 , respectively, both higher than that without interlayer.…”

Section: Mechanical Characterizationsupporting

confidence: 93%

Effect of Nb or Ta Interlayer on Microstructure and Mechanical Properties of Graphite/Ti6Al4V Alloy Joints

Mao

Duan

et al. 2021

Adv Eng Mater

View full text Add to dashboard Cite

Graphite/Ti6Al4V (TC4) joining has been conducted with Cu–Ti–Ni filler and refractory metal (Nb or Ta) interlayer. Microstructural characterizations reveal that defect‐free interfaces are obtained among the refractory metal interlayer, fillers, and substrates, suggesting favorable interfacial bonding in the joints. The diffusion and dissolution of Nb or Ta atoms into the molten fillers occur during joining, leading to the formation of (Ti, R) solid solution ([Ti, R]ss, R = Nb, or Ta) in the filler layers and thickness decrease in the interlayer. Two filler layers adjacent to the interlayer primarily consist of Ti–Cu, Ti–Cu–Ni intermetallics, and (Ti, R)ss. A Ti‐rich diffusion layer and a thin TiC‐containing layer exist near TC4 and graphite substrates, respectively. The joints brazed with Nb and Ta interlayers exhibit shear strength of 2 1.0 ± 2.7 MPa and 20.2 ± 3.1 MPa, respectively, both higher than those without interlayer, implying that the introduction of refractory metal interlayer may benefit the joint stress relaxation by its intermediate coefficient of thermal expansion and high ductility. The joint strength with Nb interlayer is slightly higher than that with Ta interlayer, mainly attributed to the relatively lower elastic modules and yield strength of Nb.

show abstract

Section: Mechanical Characterizationsupporting

confidence: 93%

Effect of Nb or Ta Interlayer on Microstructure and Mechanical Properties of Graphite/Ti6Al4V Alloy Joints

Mao

Duan

et al. 2021

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…where k 0 is the pre-exponential factor and Q is the effective activation energy of the sintering process. According to Equations (2) and 3under isothermal conditions (k = const), we have a linear dependence:…”

Section: Spark Plasma Sintering: Kineticsmentioning

confidence: 99%

“…Copper-based composites, which involve immiscible elements (e.g., Cr, W, Mo), so-called pseudo-alloys, have attracted a vast of attention for a variety of applications including a new generation of electrical contacts, electrodes for point welding, and radiators, etc. [1][2][3][4][5][6]. Due to a unique combination of thermal, electrical, and mechanical properties as well as being corrosion resistant under applied high-voltage, such materials have found specific use as the electrodes in vacuum interrupters of high-voltage electric circuits [7].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Conventional and Flash Spark Plasma Sintering of Cu–Cr Pseudo-Alloys: Kinetics, Structure, Properties

Kuskov

Abedi

Moskovskikh

et al. 2021

Metals

View full text Add to dashboard Cite

Spark plasma sintering (SPS) is widely used for the consolidation of different materials. Copper-based pseudo alloys have found a variety of applications including as electrodes in vacuum interrupters of high-voltage electric circuits. How does the kinetics of SPS consolidation for such alloys depend on the heating rate? Do SPS kinetics depend on the microstructure of the media to be sintered? These questions were addressed by the investigation of SPS kinetics in the heating rate range of 0.1 to 50 K/s. The latter conditions were achieved through flash spark plasma sintering (FSPS). We also compared the sintering kinetics for the conventional copper–chromium mixture and for the mechanically induced copper/chromium nanostructured particles. It was shown that, under FSPS conditions, the observed maximum consolidation rates were 20–30 times higher than that for conventional SPS with a heating rate of 100 K/min. Under the investigated conditions, the sintering rate for mechanically induced composite Cu/Cr particles was 2–4 times higher compared to the conventional Cu + Cr mixtures. The apparent sintering activation energy for the Cu/Cr powder was twice less than that for Cu–Cr mixture. It was concluded that the FSPS of nanostructured powders is an efficient approach for the fabrication of pseudo-alloys.

show abstract

“…Due to its unique properties, the idea of obtaining composite materials consisting of a metal matrix and graphene has been developed for the past decades. It was found that the introduction of graphene into a metal matrix results in an increase its mechanical resistance and strength [ 6 , 7 , 8 , 9 , 10 ]. Graphite inclusions improve the impact strength of layered carbon/Ni and carbon/Cu composites [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanoparticle Size on the Mechanical Strength of Ni–Graphene Composites

et al. 2021

View full text Add to dashboard Cite

The effect of the size of nickel nanoparticles on the fabrication of a Ni–graphene composite by hydrostatic pressure at 0 K followed by annealing at 1000 and 2000 K is studied by molecular dynamics simulation. Crumpled graphene, consisting of crumpled graphene flakes interconnected by van der Waals forces is chosen as the matrix for the composite and filled with nickel nanoparticles composed of 21 and 47 atoms. It is found that the main factors that affect composite fabrication are nanoparticle size, the orientation of the structural units, and temperature of the fabrication process. The best stress–strain behavior is achieved for the Ni/graphene composite with Ni47 nanoparticle after annealing at 2000 K. However, all of the composites obtained had strength property anisotropy due to the inhomogeneous distribution of pores in the material volume.

show abstract

Fabrication and characterization of nanostructured immiscible Cu–Ta alloys processed by high-pressure torsion

Cited by 22 publications

References 40 publications

Effect of Nb or Ta Interlayer on Microstructure and Mechanical Properties of Graphite/Ti6Al4V Alloy Joints

Effect of Nb or Ta Interlayer on Microstructure and Mechanical Properties of Graphite/Ti6Al4V Alloy Joints

Comparison of Conventional and Flash Spark Plasma Sintering of Cu–Cr Pseudo-Alloys: Kinetics, Structure, Properties

Effect of Nanoparticle Size on the Mechanical Strength of Ni–Graphene Composites

Contact Info

Product

Resources

About