Aging Behavior of Nano-SiC/2014Al Composite Fabricated by Powder Metallurgy and Hot Extrusion Techniques

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• 作者：Zhiguo Wang¹ ; ² ; Chuanpeng Li¹ ; ² ; Huiyuan Wang¹ ; ^{wanghuiyuan@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xian Zhu¹ ; Min Wu¹ ; Jiehua Li³ ; Qichuan Jiang¹
• 关键词：Metal matrix composites ; Nano-SiC ; Powder metallurgy ; Hot extrusion ; Aging hardening
• 刊名：Journal of Materials Science & Technology
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：32
• 期：10
• 页码：1008-1012
• 全文大小：1365 K

文摘

The aging-hardening kinetics of powder metallurgy processed 2014Al alloy and its composite have been studied. The existence of n-SiC particulates leads to the increase of peak hardness. Interestingly, the aging-hardening peak of the composite takes place at earlier time than that of the unreinforced alloy. Transmission electron microscopy (TEM) studies indicated that the major precipitation phases are Al₅Cu₂Mn₃ and θ′ (Al₂Cu). Besides, Ω phase appeared in both specimens at peak hardening condition, which has been rarely observed previously in aluminum metal matrix composites without Ag. Accelerated aging kinetics and increased peak hardness may be attributed to the higher dislocation density resulted from the mismatch of coefficients of thermal expansion between n-SiC and 2014Al matrix. The results are beneficial to fabricating high performance composites for the application in automobile field such as pistons, driveshaft tubes, brake rotors, bicycle frames, railroad brakes.