Dispersion-Hardened Al<SUB>2</SUB>O<SUB>3</SUB> Alloys by Electrodeposition

DOI Web Site Web Site

Bibliographic Information

Other Title
  • 電着ニッケル-アルミナ分散強化合金
  • デンチャク ニッケル-アルミナ ブンサン キョウカ ゴウキン

Search this article

Description

Nickel-Al2O3 alloys were electrodeposited from a nickel-electrolyte containing fine alumina particles suspended in solution by air and mechanical agitations. The uniform dispersion of alumina in the deposit was examined with an electron probe microanalyzer and the concentration of alumina in the alloys was determined by means of colorimetry.<BR>The effect of dispersion-strengthening was retained up to high temperatures such as about 1400°C and increased with the increase in the volume fraction of alumina particles. The recrystallization and grain growth of the matrix in the range of higher temperatures were remarkably retarded as compared with those of pure nickel. It was directly observed with a scanning electron microscope that the aggregation of alumina particles began at about 800°C and the crystal growth of α-alumina and the dimple structure of the matrix became conspicuous above 1300°C. Furthermore, the aggregating mechanism of the dispersed alumina was deduced from these results. There was a linear relation between micro-Vickers hardness and the reciprocal of interparticle spacing. The relation between hardness and yield strength of the alloys was also discussed.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top