Origin of Insignificant Strengthening Effect of CNTs in T6-Treated CNT/6061Al Composites

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2018,（2）
• 页码范围: 134-142
• 页数: 9页
• 语种: 英文

摘要

Carbon nanotube (CNT)-reinforced 6061Al (CNT/6061Al) composites were fabricated via powder metallurgy combined with friction stir processing (FSP).CNTs were dispersed after FSP and accelerated the precipitation process of the CNT/6061Al composites.However,the strengthening effect of CNTs on the T6-treated materials was insignificant,while the composites under the FSP and solution treatment conditions exhibited increased strength compared to the matrix.Precipitate-free zones (PFZs) were detected around CNTs in the T6-treated CNT/6061Al composites,and a model was proposed to describe the effect of PFZs on strength.The calculations indicated that the strength of PFZs was similar to that of the T6-treated 6061Al.As a result,the strengthening effect of CNTs on the T6-treated CNT/6061Al composites was insignificant.