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Fracture behaviour of boride-dispersed composites fabricated by hot-pressing amorphous Ni60Mo30B10 powder (1998)

Davies, I. J. ; Nozue, A. ; Nakabayashi, S. ; [et al.]

Springer

Journal of materials science 33 (1998), S. 4727-4732

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ISSN: 1573-4803

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract Microstructural and mechanical property characteristics were investigated for three boride-dispersed composites fabricated by hot-pressing amorphous Ni60Mo30B10 powder. The first composite was tested in the as-hot-pressed condition (HP) whilst the other specimens were subjected to a solution treatment (ST) and further ageing (STA). X-ray diffraction showed the HP and ST composites to consist of Mo2NiB2 particles in a Ni-rich matrix whilst the STA material contained Mo2NiB2 particles in a NiB3Mo matrix. The hardness and fracture toughness decreased and increased, respectively, for the ST material compared to the HP case whilst the STA case showed increased and decreased hardness and fracture toughness, respectively, compared to the ST composite. These results were explained in terms of the brittle–ductile–brittle fracture modes for the HP–ST–STA specimens. In addition, the HP specimen showed only a 15% decrease in compressive strength at 973 K compared to 303 K.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1004441205253

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Multi-electron oxidation of formaldehyde on a platinum electrode (1995)

Nakabayashi, S. ; Tamura, K. ; Uosaki, K.

New York, NY : Wiley-Blackwell

Polymers for Advanced Technologies 6 (1995), S. 141-143

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ISSN: 1042-7147

Keywords: electrocatalysis ; multi-electron transfer ; non-linear oscillation ; laser kinetic spectroscopy ; surface adsorption ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: The time evolution of a self-sustained potential oscillation under constant current oxidation of formaldehyde was observed on the rotating ring disk electrode assemble. Under the condition when the potential was controlled, the laser deflection voltammogram as well as the conventional cyclic voltammogram were measured. The mechanism of the multi-electron oxidationof formaldhyde on a platinum electode is discussed.

Additional Material: 2 Ill.