Effect of cooling rate on precipitation during homogenization cooling in excess Si type Al–Mg–Si alloy

• DOI: 10.1016/j.matlet.2020.128363
• Publication Date: 2020-07-21T16:22:31Z
• Authors: Shuaishuai Qin; Artenis Bendo; Taiki Tsuchiya; Seungwon Lee; Kenji Matsuda
• Keywords: Homogenization; Lath; Slow cooling

Abstract The effect of the cooling rate on the precipitation during homogenization cooling in the Al-0.31 Mg-0.68Si wt.% alloy was investigated. Different cooling rates (furnace-cooling/air-cooling) were used in this work. For the samples cooled in furnace (20 K/h), the predominant phases formed in the matrix were rod/lath-like shaped and the precipitates were identified as Si phase and Type-A. For the samples cooled in air (~830 K/h), few precipitates could be observed. However, many “boundaries” appeared within the grains. In this work we confirmed for the first time that the longitudinal directions of many rod/lath-shaped precipitates forming in these “boundaries” were only along the [1 0 0]Al and [0 1 0]Al directions.