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Metallic Materials Vol. 50 (2012), no. 2, pp.89-95

Title: Microstructure and electrical resistivity features in Al-Al4C3 in-situ composite after attrition milling and double sequence of compaction and high temperature treatment

Abstract: An Al-based composite powder (Al-2%C) was prepared by mechanical alloying (MA). Mixed powders were cold compacted and annealed using two consecutive treatments. Microstructure progresses in both; the as-milled and the as-pressed and annealed conditions were characterized by X-ray diffractometry (XRD) and transmission electron microscopy (TEM). During MA, C diffused into Al to form a solid solution. However, for MA, primary compaction and 1 hour sintering at 650 °C was insufficient to synthesize Al with C. Only after secondary pressing and long-time annealing at 550 °C, fine precipitates of Al4C3 were formed throughout the matrix. Increase in Al4C3 dispersion and stabilization of a dense dislocation substructure was the main source of systematic rise in both electric resistivity and hardness.

Keywords: mechanical alloying, synthesizing, Al4C3 precipitation, electrical resistivity
Year: 2012, Volume: 50, Issue: 2 Page From: 89, Page To: 95
Price: 3.50 €

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