Improved fracture toughness of boride coating developed with a diffusion annealing process

Diffusion annealing experiments in Al-Ni cold rolled strip was conducted in nitrogen protection. The characterization of diffusion layers between pure Al and pure Ni metals has been analyzed. The analysis results show that the diffusion layers would be composed of solid-solution of Al in Ni marked as Ni (Al), Ni3Al and Ni5Al3 compounds. During diffusion processing, the diffusion speed of Al to Ni was faster than that of Ni to Al. This implied a possibility to form chemical connection of Al-Ni by solid-solution without intermetallic compounds formation to obtain good mechanical and electric properties through optimizing annealing temperature and holding time.

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Scratch resistance of cobalt boride layer subjected to a diffusion annealing process

Materials Letters ◽

10.1016/j.matlet.2021.131352 ◽

2021 ◽

pp. 131352

Author(s):

R.C. Morón ◽

A.M. Delgado-Brito ◽

I. Campos-Silva

Keyword(s):

Scratch Resistance ◽

Boride Layer ◽

Annealing Process ◽

Diffusion Annealing ◽

Cobalt Boride

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Influence of the diffusion annealing process in the corrosion susceptibility of cobalt boride layer immersed in Hank's solution

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2021.127462 ◽

2021 ◽

pp. 127462

Author(s):

A.M. Delgado-Brito ◽

I. Mejía-Caballero ◽

M. Palomar-Pardavé ◽

J. Martínez-Trinidad ◽

I. Campos-Silva

Keyword(s):

Boride Layer ◽

Annealing Process ◽

Diffusion Annealing ◽

Cobalt Boride ◽

Corrosion Susceptibility ◽

Hank’S Solution

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Evolution of boride layers during a diffusion annealing process

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2016.11.054 ◽

2017 ◽

Vol 309 ◽

pp. 155-163 ◽

Cited By ~ 11

Author(s):

I. Campos-Silva ◽

M. Flores-Jiménez ◽

D. Bravo-Bárcenas ◽

H. Balmori-Ramírez ◽

J. Andraca-Adame ◽

...

Keyword(s):

Annealing Process ◽

Diffusion Annealing

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Precipitation in Al-Li-Zr alloys

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100121338 ◽

1992 ◽

Vol 50 (1) ◽

pp. 186-187

Author(s):

D.M. Vanderwalker

Keyword(s):

Fracture Toughness ◽

Precipitation Hardening ◽

Weight Ratio ◽

High Strength ◽

Transmission Electron ◽

Water Quench ◽

Aluminum Lithium ◽

Aluminum Lithium Alloys ◽

Lithium Alloys ◽

Zr Alloys

Aluminum-lithium alloys have a low density and high strength to weight ratio. They are being developed for the aerospace industry.The high strength of Al-Li can be attributed to precipitation hardening. Unfortunately when aged, Al-Li aquires a low ductility and fracture toughness. The precipitate in Al-Li is part of a sequence SSSS → Al3Li → AlLi A description of the phases may be found in reference 1 . This paper is primarily concerned with the Al3Li phase. The addition of Zr to Al-Li is being explored to find the optimum in properties. Zirconium improves fracture toughness and inhibits recrystallization. This study is a comparision between two Al-Li-Zr alloys differing in Zr concentration.Al-2.99Li-0.17Zr(alloy A) and Al-2.99Li-0.67Zr (alloy B) were solutionized for one hour at 500oc followed by a water quench. The specimens were then aged at 150°C for 16 or 40 hours. The foils were punched into 3mm discs. The specimens were electropolished with a 1/3 nitric acid 2/3 methanol solution. The transmission electron microscopy was conducted on the JEM 200CX microscope.

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